Journal articles: 'Thermal barriers (plasma control)'

1

Bernard, Benjamin, Luc Bianchi, André Malié, Aurélien Joulia, and Benjamin Rémy. "Columnar suspension plasma sprayed coating microstructural control for thermal barrier coating application." Journal of the European Ceramic Society 36, no. 4 (March 2016): 1081–89. http://dx.doi.org/10.1016/j.jeurceramsoc.2015.11.018.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Li, R. M., S. C. Joshi, and H. W. Ng. "Characterization of plasma-sprayed alumina as thermal control coating for micro-satellite applications." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 219, no. 2 (April 1, 2005): 111–19. http://dx.doi.org/10.1243/146442005x10292.

Full text

Abstract:

Conventional thermal control materials (TCMs) used in satellites tend to deteriorate in the severe space environment, many times leading to unanticipated mission problems. New and better TCMs are constantly sought to reduce difficulties in satellite thermal design. In this paper, the possibility of using plasma-sprayed alumina (PSA) coating for thermal control of a satellite is examined. Such PSA coatings have proved to be a good thermal barrier coating material for hot section components in aircraft engines. Panels of aluminum alloys such as 2024-T3, 6061-T6, 7075, and so on which are commonly used for satellite applications, form a very compatible substrate for PSA coatings. Various physical and processing parameters and simulated in-service behaviour for PSA were studied analytically and experimentally. Preliminary investigations reveal that the PSA coatings have good potential as a substitute to conventional TCMs for micro-satellite panels, including solar arrays.

APA, Harvard, Vancouver, ISO, and other styles

3

Balasubramanian, Manjula, Anita Sebastian, Marie Peddinghaus, Gregory Fridman, Alexander Fridman, Alexander Gutsol, Gregory Friedman, and Brooks Ari. "Dielectric Barrier Discharge Plasma in Coagulation and Sterilization." Blood 108, no. 11 (November 16, 2006): 4043. http://dx.doi.org/10.1182/blood.v108.11.4043.4043.

Full text

Abstract:

Abstract Rapid loss of blood, in the operating room or trauma, necessitates a need for hastening coagulation Attempts to hasten coagulation include electrocautery based on thermal plasma discharges. Although there have been other effective attempts to prevent further loss of blood via coagulation, tissue damage and dessication can occur as a result of the high temperatures 2. Our group has developed a method to initiate rapid coagulation with dielectric plasma discharge (cold). Initial experiments were performed using fresh blood from volunteers to compare time for coagulation of whole blood exposed to plasma, one minute versus 10 minutes. We tried same experiments on cut cadaver organs such as spleen and placenta which showed evidence of rapid coagulation compared to control without evidence of tissue damage. Our research team has developed a novel method using non-thermal dielectric barrier discharge plasma (DBD plasma) to coagulate blood and sterilize tissues without causing thermal damage. This treatment would be safe to patients because no exposed electrodes are involved and high frequency current (under 10 KHz) is kept below mili-ampere. Our experiments have shown that such plasma treatment hastens blood coagulation and causes simultaneous wound sterilization via a large concentration of chemically active species in plasma that are ions, radicals (O, OH, N) and electronically-excited atoms and molecules. A kinetic model of blood coagulation under influence of DBD plasma was constructed. The model assumes contact flux of positive ions from DBD plasma into the surface of the blood being treated. Once at the surface, these ions recombine, leading to formation of aqueous Hydrogen ions which catalyze the release of Calcium ions into the blood. The addition of Calcium ions to blood speeds up the coagulation process proportionally to the amount of ions added. The model demonstrates thrombin formation in the presence of DBD plasma peaking and occurring within significantly less time compared to thrombin formation without DBD plasma3. Such medically relevant demonstrations and mathematical explanations have allowed us to develop a portable device that may prove useful in situations where control of bleeding is crucial. In addition, because of the potential for simultaneous sterilization, this device may also help to decrease infections. This pioneering technology will find applicability in many clinical situations: sterilization of human tissue surfaces prior to surgery and sterilization of catheters, a well-known cause of morbidity in hospitals.

APA, Harvard, Vancouver, ISO, and other styles

4

Arjunan, Krishna Priya, Gary Friedman, Alexander Fridman, and Alisa Morss Clyne. "Non-thermal dielectric barrier discharge plasma induces angiogenesis through reactive oxygen species." Journal of The Royal Society Interface 9, no. 66 (June 8, 2011): 147–57. http://dx.doi.org/10.1098/rsif.2011.0220.

Full text

Abstract:

Vascularization plays a key role in processes such as wound healing and tissue engineering. Non-thermal plasma, which primarily produces reactive oxygen species (ROS), has recently emerged as an efficient tool in medical applications including blood coagulation, sterilization and malignant cell apoptosis. Liquids and porcine aortic endothelial cells were treated with a non-thermal dielectric barrier discharge plasma in vitro . Plasma treatment of phosphate-buffered saline (PBS) and serum-free medium increased ROS concentration in a dose-dependent manner, with a higher concentration observed in serum-free medium compared with PBS. Species concentration inside cells peaked 1 h after treatment, followed by a decrease 3 h post treatment. Endothelial cells treated with a plasma dose of 4.2 J cm –2 had 1.7 times more cells than untreated samples 5 days after plasma treatment. The 4.2 J cm –2 plasma dose increased two-dimensional migration distance by 40 per cent compared with untreated control, while the number of cells that migrated through a three-dimensional collagen gel increased by 15 per cent. Tube formation was also enhanced by plasma treatment, with tube lengths in plasma-treated samples measuring 2.6 times longer than control samples. A fibroblast growth factor-2 (FGF-2) neutralizing antibody and ROS scavengers abrogated these angiogenic effects. These data indicate that plasma enhanced proliferation, migration and tube formation is due to FGF-2 release induced by plasma-produced ROS. Non-thermal plasma may be used as a potential tool for applying ROS in precise doses to enhance vascularization.

APA, Harvard, Vancouver, ISO, and other styles

5

Nagaraj, Gayathri, Manjula Balasubramanian, Sameer Kalghatgi, Andrew S. Wu, Ari D. Brooks, Gregory Fridman, Moogega Cooper, et al. "Mechanism of Blood Coagulation by Non-Thermal Atmospheric Pressure Dielectric Barrier Discharge Plasma." Blood 110, no. 11 (November 16, 2007): 3162. http://dx.doi.org/10.1182/blood.v110.11.3162.3162.

Full text

Abstract:

Abstract Introduction: Non-thermal atmospheric pressure dielectric barrier discharge plasma (cold plasma due to its non-thermal nature) has emerged as a promising new tool in medicine due to its ability to coagulate blood rapidly, sterilize tissue without thermal damage and induce apoptosis in malignant tissue. The potential clinical applicability of non-thermal plasma lies in its use in controlling intra-operative microvascular bleeding in organs and in endoscopy. Non-thermal plasma can also be used to treat superficial wounds in trauma through hemostasis while simultaneously inducing surface sterilization. We have previously demonstrated that non-thermal plasma hastens blood coagulation on cut tissue surfaces and accelerates clot formation in whole blood five times faster than natural coagulation. A series of experiments were undertaken to investigate the mechanism of coagulation by non-thermal plasma. Methods/Results: We initially postulated that changes in pH and/or extracellular Ca2+ as a possible mechanism for non-thermal plasma mediated coagulation. Our studies however showed no significant changes in pH or Ca2+ in treated blood. Thermal energy triggered coagulation as seen in conventional electrocautery as well as electric field effects were eliminated as other possible mechanisms. The role of reactive oxygen species (ROS) in coagulation was studied, as non-thermal plasma is known to produce ROS in water. ROS production in blood was blocked with sodium pyruvate, an ROS scavenger, and the results showed no effect on non-thermal plasma induced coagulation. Specific effects of non-thermal plasma on citrated blood samples revealed extremely rapid coagulation with surface gel formation, while clotting studies (PT, aPTT) performed on the plasma beneath the gel revealed consumption of coagulation factors. Examination of the clot formed by non-thermal plasma using Scanning Electron Microscopy (SEM) showed platelet activation with pseudopodia formation, aggregation, and fibrin formation. The effects of non-thermal plasma on fibrinogen solution treated at physiologic pH showed a change in opacity suggesting clot formation. Dynamic Light Scattering (DLS) was used to measure particle size distributions of treated and untreated fibrinogen solutions. Treated fibrinogen exhibited a multi-modal distribution of sizes with the largest size corresponding to the size of fibrin-like structures. This suggests that non-thermal plasma may coagulate blood by the conversion of fibrinogen to fibrin. Evaluation of albumin, our control protein given its non-involvement in coagulation, showed no changes upon exposure to non-thermal plasma. Conclusion: Non-thermal plasma likely promotes coagulation by enhancing the physiologic coagulation process through direct activation of fibrinogen as well as platelet activation and aggregation. Future research will further evaluate the mechanisms of non-thermal plasma induced platelet activation and effects on other proteins in the coagulation cascade. This will lead to newer insights into the physiological aspects of coagulation and clinical utility of non-thermal plasma in medicine.

APA, Harvard, Vancouver, ISO, and other styles

6

Huang, Ji Bo, Wei Ze Wang, Yuan Jun Li, Huan Jie Fang, Dong Dong Ye, Xian Cheng Zhang, and Shan Tung Tu. "A novel strategy to control the microstructure of plasma-sprayed YSZ thermal barrier coatings." Surface and Coatings Technology 402 (November 2020): 126304. http://dx.doi.org/10.1016/j.surfcoat.2020.126304.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Świecimska, Magdalena, Mirela Tulik, Božena Šerá, Patrycja Golińska, Juliána Tomeková, Veronika Medvecká, Helena Bujdáková, Tomasz Oszako, Anna Zahoranová, and Michal Šerý. "Non-Thermal Plasma Can Be Used in Disinfection of Scots Pine (Pinus sylvestris L.) Seeds Infected with Fusarium oxysporum." Forests 11, no. 8 (August 1, 2020): 837. http://dx.doi.org/10.3390/f11080837.

Full text

Abstract:

The aim of this study was to use diffuse coplanar surface barrier discharge (DCSBD) non-thermal plasma for the disinfection of pine seed surfaces infected with Fusarium oxysporum spores. Artificially infected seeds of Scots pine (Pinus sylvestris L.) were treated with plasma for the following exposure times: 1 s, 3 s, 5 s, 10 s, 15 s, 20 s, 30 s, and 60 s, and subsequently germinated on agar medium in Petri dishes at room temperature for the estimation of seed germination and disinfection effect of plasma treatment. Results of the treated samples were compared to the control samples, which were prepared as follows: seeds uninfected and non-treated with plasma (first control); seeds infected with F. oxysporum and non-treated with plasma (second control); and seeds infected with F. oxysporum, non-treated with plasma, but sterilized with 30% perhydrol (third control). Obtained results indicate that 3 s plasma treatment was an optimal time to inhibit F. oxysporum growth, and at the same time, increase the seed germination. In addition, our results are the first to show the practical application of non-thermal plasma in disinfecting infected Scots pine seeds and improving their germination. According to the results of this study, non-thermal plasma can serve as a seed surface disinfectant in the regeneration of different pine species.

APA, Harvard, Vancouver, ISO, and other styles

8

Zhu, Tao, Yan Dong Wan, Chun Hui Zhang, Ming Han Sun, Xu Wen He, Dong Yao Xu, and Xin Qian Shu. "VOCs Decomposition Using Multiple Catalysis in Non-Thermal Plasma Processing." Advanced Materials Research 152-153 (October 2010): 973–77. http://dx.doi.org/10.4028/www.scientific.net/amr.152-153.973.

Full text

Abstract:

A series of experiments were performed for toluene removal from a gaseous influent at normal temperature and atmospheric pressure by adsorption & non-thermal plasma strength & nano-catalysis technology. Non-thermal plasma was generated by dielectric barrier discharge. Sorbent & nano-catalyst were called combined catalyst which included MnO2/γ-Al2O3 and nano-Ba0.8Sr0.2Zr0.1Ti0.9O3 catalyst. MnO2/γ-Al2O3 has an advantage for ozone removal, while nano-Ba0.8Sr0.2Zr0.1Ti0.9O3 is a kind of good material for improving energy utilize rate. The results showed the synergistic technology resulted in greater enhancement of toluene removal efficiency and energy efficiency and a better inhibition for O3 formation in the gas exhaust. Based on data analysis of FT-IR, the experiment discussed decomposition mechanism and reaction process of toluene. The results showed that synergic effect could control byproducts effectively.

APA, Harvard, Vancouver, ISO, and other styles

9

Li, Yuanjun, Jibo Huang, Weize Wang, Dongdong Ye, Huanjie Fang, Dong Gao, Shantung Tu, Xueping Guo, and Zexin Yu. "Control of the Pore Structure of Plasma-Sprayed Thermal Barrier Coatings through the Addition of Unmelted Porous YSZ Particles." Coatings 11, no. 3 (March 21, 2021): 360. http://dx.doi.org/10.3390/coatings11030360.

Full text

Abstract:

In this study, a new pore structure control method for plasma-sprayed thermal barrier coatings (TBCs) through the addition of unmelted, porous yttria-stabilized zirconia (YSZ) particles was investigated. Through a unique way of feeding powder, two powder feeders were used simultaneously at different positions of the plasma flame to deposit a composite structure coating in which a conventional plasma-sprayed coating was used as a matrix and unmelted micro-agglomerated YSZ particles were dispersed in the dense conventional coating matrix as second-phase particles. The effects of the distribution and content of second-phase particles on the microstructure, mechanical properties, and lifetime were explored in a furnace cyclic test (24 h) of the composite coating. The mechanical properties and lifetime of the composite coating depend on the content and morphology of the particles embedded in the coating. The lifetime of the composite structure coatings is significantly higher than that of the conventional coatings. By adjusting the spraying parameters, the lifetime of the composite coating prepared under the optimum process is up to 145 days, which is about three times that of the conventional coating. The results of this study provide guidance for the preparation of high-performance composite structure TBCs.

APA, Harvard, Vancouver, ISO, and other styles

10

Starikovskiy, A. Yu, and N. L. Aleksandrov. "Gasdynamic Flow Control by Ultrafast Local Heating in a Strongly Nonequilibrium Pulsed Plasma." Plasma Physics Reports 47, no. 2 (February 2021): 148–209. http://dx.doi.org/10.1134/s1063780x21020069.

Full text

Abstract:

Abstract— The paper presents a review of modern works on gasdynamic flow control using a highly nonequilibrium pulsed plasma. The main attention is paid to the effects based on ultrafast (on the nanosecond time scale for atmospheric pressure) local gas heating, since, at present, the main successes in controlling high-speed flows by means of gas discharges are associated with this thermal mechanism. Attention is paid to the physical mechanisms responsible for the interaction of the discharge with gas flows. The first part of the review outlines the most popular approaches for pulsed energy deposition in plasma aerodynamics: nanosecond surface barrier discharges, pulsed spark discharges, and femto- and nanosecond optical discharges. The mechanisms of ultrafast heating of air at high electric fields realized in these discharges, as well as during the decay of the discharge plasma, are analyzed separately. The second part of the review gives numerous examples of plasma-assisted control of gasdynamic flows. It considers control of the configuration of shock waves in front of a supersonic object, control of its trajectory, control of quasi-stationary separated flows and layers, control of a laminar–turbulent transition, and control of static and dynamic separation of the boundary layer at high angles of attack, as well as issues of the operation of plasma actuators in different weather conditions and the use of plasma for the de-icing of a flying object.

APA, Harvard, Vancouver, ISO, and other styles

11

Jayaraman, Balaji, Siddharth Thakur, and Wei Shyy. "Modeling of Fluid Dynamics and Heat Transfer Induced by Dielectric Barrier Plasma Actuator." Journal of Heat Transfer 129, no. 4 (January 2, 2007): 517–25. http://dx.doi.org/10.1115/1.2709659.

Full text

Abstract:

Glow discharge at atmospheric pressure using a dielectric barrier discharge can induce fluid flow, and can be used for active control of aerodynamics and heat transfer. In the present work, a modeling framework is presented to study the evolution and interaction of such athermal nonequilibrium plasma discharges in conjunction with low Mach number fluid dynamics and heat transfer. The model is self-consistent, coupling the first-principles-based discharge dynamics with the fluid dynamics and heat transfer equations. Under atmospheric pressure, the discharge can be simulated using a plasma–fluid instead of a kinetic model. The plasma and fluid species are treated as a two-fluid system coupled through force and pressure interactions, over decades of length and time scales. The multiple-scale processes such as convection, diffusion, and reaction/ionization mechanisms make the transport equations of the plasma dynamics stiff. To handle the stiffness, a finite-volume operator-split algorithm capable of conserving space charge is employed. A body force treatment is devised to link the plasma dynamics and thermo-fluid dynamics. The potential of the actuator for flow control and thermal management is illustrated using case studies.

APA, Harvard, Vancouver, ISO, and other styles

12

Abotaleb, Abeer O., Naglaa F. Badr, and Usama M. Rashed. "Assessment of the potential of non-thermal atmospheric pressure plasma discharge and microwave energy against Tribolium castaneum and Trogoderma granarium." Bulletin of Entomological Research 111, no. 5 (March 26, 2021): 528–43. http://dx.doi.org/10.1017/s0007485321000225.

Full text

Abstract:

AbstractThis study was carried out to investigate the efficacy of the non-thermal atmospheric pressure plasma produced with dielectric barrier discharge (APPD) using air as a processing gas and microwave energy to control Tribolium castaneum and Trogoderma granarium adults and larvae in wheat grains. Insects’ mortality was found to be power and time-dependent. The results indicated that non-thermal APPD and the microwave have enough insecticidal effect on the target pests. From the bioassay, LT50's and LT90's levels were estimated, T. granarium larvae appeared more tolerant to non-thermal APPD and the microwave energy than adults 7 days post-exposure. The germination percentage of wheat grains increased as the time of exposure to the non-thermal APPD increased. On the contrary, the germination percentage of wheat grains decreased as the time of exposure to the microwave increased. In addition, changes in antioxidant enzyme activities, catalase (CAT), glutathione S-transferase (GST) and peroxidase, in adults and larvae were examined after 24 h post-treatment to non-thermal APPD at 15.9 W power level, which caused 50% mortality. The activity of CAT, GST and lipid peroxide in the treated larvae showed a significant increase post-exposure to the non-thermal APPD at 15.9 W power level. On the other hand, no significant change in GSH-Px activity was observed. Reductions in the level of glutathione (GSH) and protein content occurred in treated larvae in comparison with the control.

APA, Harvard, Vancouver, ISO, and other styles

13

Katiyar, Kritika S., Abraham Lin, Alexander Fridman, Carolyn E. Keating, D. Kacy Cullen, and Vandana Miller. "Non-Thermal Plasma Accelerates Astrocyte Regrowth and Neurite Regeneration Following Physical Trauma In Vitro." Applied Sciences 9, no. 18 (September 8, 2019): 3747. http://dx.doi.org/10.3390/app9183747.

Full text

Abstract:

Non-thermal plasma (NTP), defined as a partially ionized gas, is an emerging technology with several biomedical applications, including tissue regeneration. In particular, NTP treatment has been shown to activate endogenous biological processes to promote cell regrowth, differentiation, and proliferation in multiple cell types. However, the effects of this therapy on nervous system regeneration have not yet been established. Accordingly, the current study explored the effects of a nanosecond-pulsed dielectric barrier discharge plasma on neural regeneration. Following mechanical trauma in vitro, plasma was applied either directly to (1) astrocytes alone, (2) neurons alone, or (3) neurons or astrocytes in a non-contact co-culture. Remarkably, we identified NTP treatment intensities that accelerated both neurite regeneration and astrocyte regrowth. In astrocyte cultures alone, an exposure of 20–90 mJ accelerated astrocyte re-growth up to three days post-injury, while neurons required lower treatment intensities (≤20 mJ) to achieve sub-lethal outgrowth. Following injury to neurons in non-contact co-culture with astrocytes, 20 mJ exposure of plasma to only neurons or astrocytes resulted in increased neurite regeneration at three days post-treatment compared to the untreated, but no enhancement was observed when both cell types were treated. At day seven, although regeneration further increased, NTP did not elicit a significant increase from the control. However, plasma exposure at higher intensities was found to be injurious, underscoring the need to optimize exposure levels. These results suggest that growth-promoting physiological responses may be elicited via properly calibrated NTP treatment to neurons and/or astrocytes. This could be exploited to accelerate neurite re-growth and modulate neuron-astrocyte interactions, thereby hastening nervous system regeneration.

APA, Harvard, Vancouver, ISO, and other styles

14

Liu, Shuai, Zhihua Feng, Deqi Liu, Xiaofei Zhang, and Liang Zhang. "Response of air drag force of the polyethylene terephthalate (PET) yarn treated via dielectric barrier discharge (DBD) plasma to its varying surface characteristics." Textile Research Journal 86, no. 20 (July 22, 2016): 2140–50. http://dx.doi.org/10.1177/0040517515621131.

Full text

Abstract:

In this paper, non-thermal plasma induced by dielectric barrier discharge (DBD) air discharging was used to treat the moving polyethylene terephthalate (PET) yarn samples and the motionless samples, respectively. The air drag force of the resultant samples was tested, and their surface characteristics were analyzed by X-ray photoelectron spectroscopy (XPS) for chemical composition and by scanning electron microscopy (SEM) for microscopic morphology. The results of the drag force of the samples indicated that, compared with the pristine yarn, the drag force of the samples treated via the two types of plasma treatment clearly varied under different processing conditions. The maximal drag force was 28.26cN for the moving sample treated at 34 V control voltage for 30 s in the discharge zone (zone A) and 27.81cN for the motionless sample treated at 36 V control voltage for 60 s in the long-lived plasma species treating zone (zone B), which increased by 18.9% and 17.0% over that of untreated sample (23.77cN), respectively. The fluctuation of the drag force probably depends on the change of the chemical composition and microstructure of the polyethylene terephthalate yarn surface, which implies that the feasibility of weaving efficiency improvement for an air-jet loom could be realized via controlling and optimizing the dielectric barrier discharge operating conditions.

APA, Harvard, Vancouver, ISO, and other styles

15

Hou, Huidong, Jocelyn Veilleux, François Gitzhofer, and Quansheng Wang. "Study of the microstructural control of Ba(Mg1/3Ta2/3)O3 perovskite thermal barrier coating deposited by solution precursor plasma spray." Surface and Coatings Technology 389 (May 2020): 125633. http://dx.doi.org/10.1016/j.surfcoat.2020.125633.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Šulák, Ivo, Karel Obrtlík, Ladislav Čelko, and Pavel Gejdoš. "Degradation of YSZ/EUCOR TBC Coating System during High Temperature Low Cycle Fatigue Tests." Solid State Phenomena 258 (December 2016): 420–23. http://dx.doi.org/10.4028/www.scientific.net/ssp.258.420.

Full text

Abstract:

Thermal barrier coatings are widely used to protect the substrate from high temperature and extremely aggressive environments in gas engines. In the present article, authors have been studied degradation of complex thermal barrier coating system deposited on polycrystalline nickel superalloy IN 713LC. The substrate material was grit blasted with alumina (Al2O3) particles prior to air plasma deposition of CoNiCrAlY bond coat. Top coat consists of conventional zirconia (ZrO2) stabilized by yttria (Y2O3) -YSZ ceramic in combination with a eutectic nanocrystalline ceramic Eucor made of zirconia (ZrO2), alumina (Al2O3) and silicia (SiO2) –in the ratio of 50/50 in wt. %. The top coat was deposited using water stabilized plasma. Test specimens with the TBC coating system were fatigued under strain control condition in fully reversed symmetrical push-pull cycles at 900°C in air. The microstructure of TBC was characterized with scanning electron microscopy and energy dispersion X-ray analysis. The coating hardness and thickness were measured. Fracture surface and polished sections parallel to the specimen axis were examined to study damage mechanisms in coatings under cyclic loading at high temperature. TBC delamination was observed at the top coat/bond coat interface after cyclic loading at high temperature. Fatigue crack initiation sites are documented. Majority of fatigue cracks start from the surface and top coat/bond coat interface.

APA, Harvard, Vancouver, ISO, and other styles

17

Obrtlík, Karel, Simona Hutařová, Ladislav Čelko, Martin Juliš, Tomáš Podrábský, and Ivo Šulák. "Effect of Thermal Barrier Coating on Low Cycle Fatigue Behavior of Cast Inconel 713LC at 900 °C." Advanced Materials Research 891-892 (March 2014): 848–53. http://dx.doi.org/10.4028/www.scientific.net/amr.891-892.848.

Full text

Abstract:

The effect of thermal barrier coating (TBC) on low cycle fatigue behavior of cast superalloy Inconel 713 LC has been studied at 900 °C. The TBC consisting of a CoNiCrAlY bond coat and a zirconia (ZrO2) top coat stabilized by 8% yttria (Y2O3) was deposited on the gauge section of cylindrical specimens using the atmospheric plasma spray technique. Cylindrical specimens of Inconel 713LC in as-received condition and with surface treatment were cyclically strained under strain control with constant total strain amplitude in symmetrical cycle at 900 °C in air. Hardening/softening curves, cyclic stress-strain curve and fatigue life data of coated and uncoated material were obtained. The stress response of the TBC coated specimens is lower in comparison with the uncoated specimens. Detrimental effect of surface treatment on the Basquin curve is documented. Specimen sectioning and fracture surface observations revealed fatigue damage mechanisms and help to discuss differences in fatigue behavior of the coated and uncoated superalloy.

APA, Harvard, Vancouver, ISO, and other styles

18

Mehta, Deepak, and Sudesh Kumar Yadav. "Impact of atmospheric non-thermal plasma and hydrothermal treatment on bioactive compounds and microbial inactivation of strawberry juice: A hurdle technology approach." Food Science and Technology International 26, no. 1 (August 1, 2019): 3–10. http://dx.doi.org/10.1177/1082013219865360.

Full text

Abstract:

The aim of this study was to investigate the hurdle effect of combining atmospheric cold plasma (ACP) with hydrothermal treatment on ascorbic acid, individual polyphenolic compounds, total phenolic content, and microbial inactivation of strawberry juice. Strawberry juice was treated with ACP for 10 and 15 min using dielectric barrier discharge at 60 kV with the input voltage of 260 V. The ascorbic acid concentration was retained maximum only in ACP treatment followed by ACP + hydrothermal treatment. Furthermore, ACP treatment for 10 min coupled with hydrothermal treatment resulted in the higher concentration of gallic acid, epigallocatechin, phloretin, naringin, hyprin, and 4-O-caffeoylquinic acid with respect to control ( p < 0.05). In addition, ACP treatment for 10 min at 60 kV in combination with hydrothermal treatment resulted in increased total phenolic content ( p < 0.05). Moreover, a 2-log microbial reduction was found in processed strawberry juice with ACP coupled-hydrothermal treatment in comparison to control juice ( p < 0.05). Therefore, ACP treatment of 10 min followed by hydrothermal treatment was found to be advantageous processing for strawberry juice to retain nutritional quality and decrease microbial load. Moreover, further optimization of ACP or hydrothermal processing with utilization of preservatives could be achieved for desired microbial inactivation for an industrial process.

APA, Harvard, Vancouver, ISO, and other styles

19

Li, Juexiu, Hongbo Zhang, Diwen Ying, Yalin Wang, Tonghua Sun, and Jinping Jia. "In Plasma Catalytic Oxidation of Toluene Using Monolith CuO Foam as a Catalyst in a Wedged High Voltage Electrode Dielectric Barrier Discharge Reactor: Influence of Reaction Parameters and Byproduct Control." International Journal of Environmental Research and Public Health 16, no. 5 (February 27, 2019): 711. http://dx.doi.org/10.3390/ijerph16050711.

Full text

Abstract:

Volatile organic compounds (VOCs) emission from anthropogenic sources has becoming increasingly serious in recent decades owing to the substantial contribution to haze formation and adverse health impact. To tackle this issue, various physical and chemical techniques are applied to eliminate VOC emissions so as to reduce atmospheric pollution. Among these methods, non-thermal plasma (NTP) is receiving increasing attention for the higher removal efficiency, non-selectivity, and moderate operation, whereas the unwanted producing of NO2 and O3 remains important drawback. In this study, a dielectric barrier discharge (DBD) reactor with wedged high voltage electrode coupled CuO foam in an in plasma catalytic (IPC) system was developed to remove toluene as the target VOC. The monolith CuO foam exhibits advantages of easy installation and controllable of IPC length. The influencing factors of IPC reaction were studied. Results showed stronger and more stable plasma discharge in the presence of CuO foam in DBD reactor. Enhanced performance was observed in IPC reaction for both of toluene conversion rate and CO2 selectivity compared to the sole NTP process at the same input energy. The longer the contributed IPC length, the higher the toluene removal efficiency. The toluene degradation mechanism under IPC condition was speculated. The producing of NO2 and O3 under IPC process were effectively removed using Na2SO3 bubble absorption.

APA, Harvard, Vancouver, ISO, and other styles

20

Luzin, Vladimir, ANdrew Vackel, Alfredo Valarezo, and Sanjay Sampath. "Neutron Through-Thickness Stress Measurements in Coatings with High Spatial Resolution." Materials Science Forum 905 (August 2017): 165–73. http://dx.doi.org/10.4028/www.scientific.net/msf.905.165.

Full text

Abstract:

A great variety of techniques are nowadays used to spray coatings with different functionality and properties for the purpose of surface enhancement. Depending on application and design, these can be thermal (plasma or high-velocity oxy-fuel are the most widely used) and warm or cold spraying, which are known to generate considerable residual stresses. This stress is a function of the spaying process as well as the material and thickness of the coating-substrate system. The mechanical integrity of coatings is critical for certain applications, e.g. wear resistant and thermal-barrier coatings, hence residual stress control and mitigation are essential in preventing the coating’s mechanical failure, improving the coating’s performance and the its operational lifetime. Although hole drilling technique or x-ray diffraction combined with layer removal method can be applicable for stress measurements in coatings, the neutron diffraction stress analysis also provides an effective and efficient tool for non-destructive through-thickness stress measurements with a commensurately high resolution, down to 0.1-0.2 mm. The most recent results of neutron diffraction stress measurements in coating systems are presented herein.

APA, Harvard, Vancouver, ISO, and other styles

21

Košelová, Zuzana, Jozef Ráheľ, and Oleksandr Galmiz. "Plasma Treatment of Thermally Modified and Unmodified Norway Spruce Wood by Diffuse Coplanar Surface Barrier Discharge." Coatings 11, no. 1 (January 1, 2021): 40. http://dx.doi.org/10.3390/coatings11010040.

Full text

Abstract:

This work deals with the treatment of wood surfaces by diffuse coplanar surface barrier discharge (DCSBD) generated at atmospheric pressure. The effect of the distance of the sample from the electrode surface and the composition of the working gas in the chamber was studied. Norway spruce (Picea abies) wood, both unmodified and thermally modified, was chosen as the investigated material. The change in the surface free energy (SFE) of the wood surface was investigated by contact angles measurements. Chemical and structural changes were studied using infrared spectroscopy, X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). Activation at a 0.15 mm gap from the electrode led in all cases to an increase in the SFE. The largest change in SFE components was recorded for wood thermally modified to 200 °C. At a 1 mm gap from the electrode increase of SFE occurred only when oxygen (O2) and argon (Ar) were used as working gas. Treatment in air and nitrogen (N2) resulted in an anomalous reduction of SFE. With the growing temperature of thermal modification, this hydrophobization effect became less pronounced. The results point out the importance of precise position control during the DCSBD mediated plasma treatment. A slight reduction of SFE on thermally modified spruce was achieved also by short term ultra-violet (UV) light exposure, generated by DCSBD.

APA, Harvard, Vancouver, ISO, and other styles

22

Mazurkiewicz, Adam, and Jerzy Smolik. "Development of Novel Nano-Structure Functional Coatings with the Use of the Original Hybrid Device." Materials Science Forum 674 (February 2011): 1–9. http://dx.doi.org/10.4028/www.scientific.net/msf.674.1.

Full text

Abstract:

A unique, original hybrid technological device, developed by the authors of the article, enabling the application of lots of different surface engineering methods in one technological process, including arc evaporation, ion nitriding, ion etching, ion implantation and electron beam evaporation is presented. The hybrid technological device has technical possibilities for the simultaneous realisation of different surface engineering methods in the same vacuum chamber. This results in the realization of advanced technological processes with the use of different surface engineering methods for forming the coating’s properties in one multi-stage technological process. Different surface engineering methods use different plasma sources and different methods of the atmosphere creation and often require different supply and control systems. A possibility of combining a few different surface treatment methods in one technological process is provided by a unique hybrid device. Selected applications of hybrid surface engineering technologies executed with the use of this original hybrid device, i.e. creation of the nano-multilayer and nano-composite Cr/Ni-Cr3C2coatings increasing the erosion wear resistance and creation of multi-layer coatings with increased thermal resistance – Thermal Barrier Coating (TBC) are presented

APA, Harvard, Vancouver, ISO, and other styles

23

Meissner, Konrad, Jane Blood, Amber M. Francis, Viktar Yermolenka, and Evan D. Kharasch. "Cyclosporine-inhibitable Cerebral Drug Transport Does Not Influence Clinical Methadone Pharmacodynamics." Anesthesiology 121, no. 6 (December 1, 2014): 1281–91. http://dx.doi.org/10.1097/aln.0000000000000391.

Full text

Abstract:

Abstract Background: Interindividual variability and drug interaction studies suggest that blood–brain barrier drug transporters mediate human methadone brain biodistribution. In vitro and animal studies suggest that methadone is a substrate for the efflux transporter P-glycoprotein, and that P-glycoprotein–mediated transport influences brain access and pharmacologic effect. This investigation tested whether methadone is a transporter in humans sample contents. Methods: Healthy volunteers received oral (N = 16) or IV (N = 12) methadone in different crossover protocols after nothing (control) or the validated P-glycoprotein inhibitor cyclosporine (4.5 mg/kg orally twice daily for 4 days, or 5 mg/kg IV over 2 h). Plasma and urine methadone and metabolite concentrations were measured by mass spectrometry. Methadone effects were measured by miosis and thermal analgesia (maximally tolerated temperature and verbal analog scale rating of discreet temperatures). Results: Cyclosporine marginally but significantly decreased methadone plasma concentrations and apparent oral clearance, but had no effect on methadone renal clearance or on hepatic N-demethylation. Cyclosporine had no effect on miosis or on R-methadone concentration–miosis relationships after either oral or IV methadone. Peak miosis was similar in controls and cyclosporine-treated subjects after oral methadone (1.4 ± 0.4 and 1.3 ± 0.5 mm/mg, respectively) and IV methadone (3.1 ± 1.0 and 3.2 ± 0.8 mm, respectively). Methadone increased maximally tolerated temperature, but analgesia testing was confounded by cyclosporine-related pain. Conclusions: Cyclosporine did not affect methadone pharmacodynamics. This result does not support a role for cyclosporine-inhibitable transporters mediating methadone brain access and biodistribution.

APA, Harvard, Vancouver, ISO, and other styles

24

Jeon, Sangheon, Pyunghwa Han, Jeonghwa Jeong, Wan Sik Hwang, and Suck Won Hong. "Highly Aligned Polymeric Nanowire Etch-Mask Lithography Enabling the Integration of Graphene Nanoribbon Transistors." Nanomaterials 11, no. 1 (December 25, 2020): 33. http://dx.doi.org/10.3390/nano11010033.

Full text

Abstract:

Graphene nanoribbons are a greatly intriguing form of nanomaterials owing to their unique properties that overcome the limitations associated with a zero bandgap of two-dimensional graphene at room temperature. Thus, the fabrication of graphene nanoribbons has garnered much attention for building high-performance field-effect transistors. Consequently, various methodologies reported previously have brought significant progress in the development of highly ordered graphene nanoribbons. Nonetheless, easy control in spatial arrangement and alignment of graphene nanoribbons on a large scale is still limited. In this study, we explored a facile, yet effective method for the fabrication of graphene nanoribbons by employing orientationally controlled electrospun polymeric nanowire etch-mask. We started with a thermal chemical vapor deposition process to prepare graphene monolayer, which was conveniently transferred onto a receiving substrate for electrospun polymer nanowires. The polymeric nanowires act as a robust etching barrier underlying graphene sheets to harvest arrays of the graphene nanoribbons. On varying the parametric control in the process, the size, morphology, and width of electrospun polymer nanowires were easily manipulated. Upon O2 plasma etching, highly aligned arrays of graphene nanoribbons were produced, and the sacrificial polymeric nanowires were completely removed. The graphene nanoribbons were used to implement field-effect transistors in a bottom-gated configuration. Such approaches could realistically yield a relatively improved current on–off ratio of ~30 higher than those associated with the usual micro-ribbon strategy, with the clear potential to realize reproducible high-performance devices.

APA, Harvard, Vancouver, ISO, and other styles

25

Cui, Yinhua, Jeong Yeul Jeong, Yuan Gao, and Sung Gyu Pyo. "Effect of Contact Plug Deposition Conditions on Junction Leakage and Contact Resistance in Multilevel CMOS Logic Interconnection Device." Micromachines 11, no. 2 (February 6, 2020): 170. http://dx.doi.org/10.3390/mi11020170.

Full text

Abstract:

Here, we developed the optimal conditions in terms of physical and electrical characteristics of the barrier and tungsten (W) deposition process of a contact module, which is the segment connecting the device and the multi-layer metallization (MLM) metal line in the development of 100 nm-class logic devices. To confirm its applicability to the logic contact of barrier and W films, a contact hole was formed, first to check the bottom coverage and the filling status of each film, then to check the electrical resistance and leakage characteristics to analyze the optimal conditions. At an aspect ratio of 3.89:1, ionized metal plasma (IMP) Ti had a bottom coverage of 40.9% and chemical vapor deposition (CVD) titanium nitride (TiN) of 76.2%, confirming that it was possible to apply the process to 100 nm logic contacts. W filling was confirmed, and a salicide etching rate (using Radio Frequency (RF) etch) of 13–18 Å/s at a 3.53:1 aspect ratio was applied. The etching rate on the thermal oxide plate was 9 Å/s. As the RF etch amount increased from 50–100 Å, the P active resistance increased by 0.5–1 Ω. The resistance also increased as the amount of IMP Ti deposition increased to 300 Å. A measurement of the borderless contact junction leakage current indicated that the current in the P + N well increased by more than an order of magnitude when IMP Ti 250 Å or more was deposited. The contact resistance value was 0.5 Ω. An AC bias improved the IMP Ti deposition rate by 10% in bottom coverage, but there was no significant difference in contact resistance. In the case of applying IMP TiN, the overall contact resistance decreased to 2 Ω compared to CVD TiN, but the distribution characteristics were poor. The best results were obtained under the conditions of RF etch 50 Å, IMP Ti 200 Å, and CVD TiN 2 × 50 Å.

APA, Harvard, Vancouver, ISO, and other styles

26

Korzhyk, Volodymyr, Vladyslav Khaskin, Andrii Grynyuk, Oleg Ganushchak, Sviatoslav Peleshenko, Oksana Konoreva, Oleksii Demianov, Volodymyr Shcheretskiy, and Nataliia Fialko. "Comparing features in metallurgical interaction when applying different techniques of arc and plasma surfacing of steel wire on titanium." Eastern-European Journal of Enterprise Technologies 4, no. 12(112) (August 26, 2021): 6–17. http://dx.doi.org/10.15587/1729-4061.2021.238634.

Full text

Abstract:

This paper reports a study into the regularities of interphase interaction, features in the formation of intermetallic phases (IMPs), and defects when surfacing steel on titanium in four ways: P-MAG, CMT, plasma surfacing by an indirect arc with conductive wire, and PAW. A general tendency has been established in the IMP occurrence when surfacing steel on titanium by all the considered methods. It was determined that the plasma surfacing technique involving an indirect arc with conductive wire is less critical as regards the IMP formation. That makes it possible to obtain an intermetallic layer of the minimum thickness (25...54 μm) in combination with the best quality in the formation of surfaced metal beads. Further minimization of the size of this layer is complicated by a critical decrease in the heat input into the metal, which gives rise to the capability of the surfaced metal to be collected in separate droplets. The formation of TiFe2, TiFe, and the α-Fe phase enriched with titanium in different percentage compositions has been observed in the transition zone of steel surfacing on titanium under different techniques and modes of surfacing. The study has shown the possibility of formation, in addition to the phases of TiFe2 and TiFe, the Ti2Fe phase at low heat input. The technique of plasma surfacing by an indirect arc with conductive wire minimizes the thermal effect on the base metal. When it is used at the border of the transition of the layer of steel surfaced on titanium, the phase composition and structure of the layers in some cases approach the composition and structure of the transition zone of the original bimetallic sheet "titanium-steel" manufactured by rolling. A layer up to 5 μm thick is formed from the β phase with an iron concentration of 44.65 % by weight and an intermetallic layer up to 0.2...0.4 μm thick, close in composition to the TiFe phase. The next step in minimizing the IMP formation might involve the introduction of a barrier layer between titanium and steel.

APA, Harvard, Vancouver, ISO, and other styles

27

Son, E. E., and D. V. Tereshonok. "Thermal and plasma flow control." Physica Scripta T142 (December 1, 2010): 014039. http://dx.doi.org/10.1088/0031-8949/2010/t142/014039.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Tanaka, Motofumi, and Etsuo Noda. "Flow Control Technology using Non-thermal Plasma." IEEJ Transactions on Fundamentals and Materials 128, no. 12 (2008): 699–702. http://dx.doi.org/10.1541/ieejfms.128.699.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Moreau, Eric. "Airflow control by non-thermal plasma actuators." Journal of Physics D: Applied Physics 40, no. 3 (January 19, 2007): 605–36. http://dx.doi.org/10.1088/0022-3727/40/3/s01.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Müller, S., and R. J. Zahn. "Air Pollution Control by Non-Thermal Plasma." Contributions to Plasma Physics 47, no. 7 (November 2007): 520–29. http://dx.doi.org/10.1002/ctpp.200710067.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Ivanov, Yu F., V. E. Gromov, D. V. Zagulyaev, S. V. Konovalov, and Yu A. Rubannikova. "Increase of alloys functional properties by electronic beam processing." Izvestiya. Ferrous Metallurgy 64, no. 2 (April 2, 2021): 129–34. http://dx.doi.org/10.17073/0368-0797-2021-2-129-134.

Full text

Abstract:

The article considers a review of domestic and foreign works on the use of intense pulsed electron beams for surface treatment of metals, alloys, cermet and ceramic materials. The advantages of using electron pulsed beams over laser beams, plasma flows, and ion beams are noted. The promising directions of using electron-beam processing were analyzed and are as following: 1 – smoothing the surface, getting rid of surface microcracks, while simultaneously changing the structural-phase state of the surface layer, to create high-performance technologies for the finishing processing of critical metal products of complex shape made of titanium alloy Ti-6Al-4V and titanium; steels of various classes; hard alloy WC – 10 wt. % Сo; aluminum; 2 – removal of microbursts formed during the manufacture of precision molds (SKD11 steel) and biomedical products (Ti-6Al-4V alloy); 3 – finishing the surface of molds and dies; 4 – improvement of the functional properties of metallic biomaterials: stainless steel, titanium and its alloys, alloys based on titanium nickelide with shape memory effect, and magnesium alloys; 5 – processing of medical devices and implants; 6 – formation of the surface alloys for powerful electrodynamic systems; 7 – improvement of the characteristics of aircraft engine and compressor blades; 8 – formation of thermal barrier coatings applied to the surface of the combustion chambers. It is shown that with the correct choice of process parameters, such as accelerating voltage, energy density of electron beam, number of pulses, and pulse duration, it is possible to control carefully and/or manipulate the characteristics of structural-phase state and surface properties. In order to improve the properties of the material and the durability of the products made of it, an important factor is the structure modification to form a submicro-nanosized grain (or subgrain structure).

APA, Harvard, Vancouver, ISO, and other styles

32

Gong, Stephanie, Kent VanEvery, Hsin Wang, and Rodney W. Trice. "Microstructure and thermal properties of inflight rare-earth doped thermal barriers prepared by suspension plasma spray." Journal of the European Ceramic Society 34, no. 5 (May 2014): 1243–53. http://dx.doi.org/10.1016/j.jeurceramsoc.2013.11.016.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Davis, E. S., S. R. Duncan, and P. S. Grant. "MODELLING FOR THERMAL CONTROL OF VACUUM PLASMA SPRAYING." IFAC Proceedings Volumes 38, no. 1 (2005): 189–94. http://dx.doi.org/10.3182/20050703-6-cz-1902.01607.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Sager, Glenn, G. H. Miley, and I. Maya. "Optimal Control Theory Applied to Fusion Plasma Thermal Stabilization." Fusion Technology 8, no. 1P2B (July 1985): 1795–800. http://dx.doi.org/10.13182/fst85-a40021.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Nishiyama, Hideya, Takehiko Sato, and Daigo Kato. "Performance of a Thermal Nonequilibrium Plasma Jet Control System." Plasma Devices and Operations 10, no. 3 (January 2002): 157–68. http://dx.doi.org/10.1080/10519990214692.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Poletaev, N. I., V. G. Shevchuk, and M. E. Khlebnikova. "Energy and Technological Aspects of the Combustion of Ionized Gas-Dispersed Systems." Eurasian Chemico-Technological Journal 18, no. 3 (November 5, 2016): 215. http://dx.doi.org/10.18321/ectj427.

Full text

Abstract:

This paper discusses the fl ame ionization effect on the combustion processes in gaseous suspensions of the dispersed fuels. It is shown that the two-phase fl ame ionization<br />affects almost all the processes of the fuel conversion – kinetics of the dispersed fuel combustion, processes of the interphase heat and mass transfer, processes of the nucleation and coagulation in the fl ame, formation of nanoscale products of the metal particles combustion. It is shown that the electrostatic interaction between the charged nanoparticles and ions or polar molecules in the gaseous phase leads to the appearance of molecular “pumps” that can signifi cantly change the kinetics of the heterogeneous chemical reactions and the heat exchange between particles and gas. The infl uence of the thermal ionization of the fl ame on the nucleation mechanism<br />and rate in gas-dispersed systems is discussed. The possibility of a barrier-free homogenous and heterogeneous nucleation in the dusty fl ame of metallic particles is shown. The effect of electrostatic and polarizing interactions of ions and molecules<br />on the kinetics of the ternary gas-phase reactions is considered. The infl uence of the monodisperse aerosol ionization degree on the kinetics of its coagulation is analyzed. It is concluded that electrostatic interaction between the particles strongly affects the inhibition of the coagulation process in gas-phase combustion products and the possibility of very fast (explosive) charged particle coagulation of monodisperse aerosols. The possibility of the targeted size of metal oxides nanoparticles control, controlled ionizing of dusty fl ames and the role of ion particle entrainment, the dependency of their size of the fl ame ionization degree are discussed. Some effects arising in complex plasma of condensed combustion products under its own electric fi elds in fl ames, also when the burning dust is entrained into a constant electric field and their practical applications for diagnosis are considered.

APA, Harvard, Vancouver, ISO, and other styles

37

Ctibor, Pavel, Barbara Nevrlá, Karel Neufuss, Jan Petrášek, and Josef Sedláček. "Plasma Spray Coatings of Natural Ores From Structural, Mechanical, Thermal, and Dielectric Viewpoints." Coatings 10, no. 1 (December 18, 2019): 3. http://dx.doi.org/10.3390/coatings10010003.

Full text

Abstract:

Various natural materials, namely ilmenite, diopside, tourmaline, olivine, garnet, and basalt, were plasma-sprayed and analyzed. This paper summarizes the various achievements of our earlier research and adds new results—mainly dielectric and optical characterizations. Plasma spraying of all of the materials was rather easy with a high feed-rate plasma system, which could process many kilograms of powder per hour. For easier characterizations, the coatings were detached from substrates in order to remain self-supporting. The plasma-sprayed layers that were coated from all studied materials acted as medium-permittivity and low-loss dielectrics, antireflective optical materials, and medium quality anti-abrasive barriers. Phase composition and microhardness were evaluated in addition to microstructure observations. Some coatings were amorphous and crystallized after further heating. As the melting points were well above 1000 °C, all of them could also serve as thermal barriers for aluminum alloys and similar metals. The only material that was not easily sprayed was tourmaline, which gave very porous coatings without environmental barrier or dielectric characteristics.

APA, Harvard, Vancouver, ISO, and other styles

38

Ouyang, Zihao, Liang Meng, Priya Raman, Tae S. Cho, and D. N. Ruzic. "Laser-assisted plasma coating at atmospheric pressure: production of yttria-stabilized zirconia thermal barriers." Journal of Physics D: Applied Physics 44, no. 26 (June 13, 2011): 265202. http://dx.doi.org/10.1088/0022-3727/44/26/265202.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Adamovich, I. V., I. Choi, N. Jiang, J.-H. Kim, S. Keshav, W. R. Lempert, E. Mintusov, M. Nishihara, M. Samimy, and M. Uddi. "Plasma assisted ignition and high-speed flow control: non-thermal and thermal effects." Plasma Sources Science and Technology 18, no. 3 (July 15, 2009): 034018. http://dx.doi.org/10.1088/0963-0252/18/3/034018.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Pernot, G., M. Stoffel, I. Savic, F. Pezzoli, P. Chen, G. Savelli, A. Jacquot, et al. "Precise control of thermal conductivity at the nanoscale through individual phonon-scattering barriers." Nature Materials 9, no. 6 (May 2, 2010): 491–95. http://dx.doi.org/10.1038/nmat2752.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Shi, J. J., D. W. Liu, and M. G. Kong. "Plasma stability control using dielectric barriers in radio-frequency atmospheric pressure glow discharges." Applied Physics Letters 89, no. 8 (August 21, 2006): 081502. http://dx.doi.org/10.1063/1.2338647.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Hillard, G. Barry. "Measured plasma conductivity of zinc-oxide-based thermal control coatings." Journal of Spacecraft and Rockets 31, no. 5 (September 1994): 910–12. http://dx.doi.org/10.2514/3.26532.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Gorry, Peter A., J. Christopher Whitehead, and Jinhui Wu. "Adaptive Control for NOx Removal in Non-Thermal Plasma Processing." Plasma Processes and Polymers 4, no. 5 (July 25, 2007): 556–62. http://dx.doi.org/10.1002/ppap.200700010.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Anikin, K. A., A. M. Borisov, A. V. Zheltukhin, A. A. Zhukov, S. V. Savushkina, I. D. Fedichkin, V. N. Chernik, and A. V. Apelfeld. "Characteristics of Thermal Control Plasma Electrolytic Coatings on Aluminum Alloy." Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques 12, no. 3 (May 2018): 531–34. http://dx.doi.org/10.1134/s1027451018030229.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Heberlein, Joachim. "New approaches in thermal plasma technology." Pure and Applied Chemistry 74, no. 3 (January 1, 2002): 327–35. http://dx.doi.org/10.1351/pac200274030327.

Full text

Abstract:

Thermal plasmas offer unique advantages for materials processing, such as high fluxes of heat and of reactant species. Recent developments have concentrated on improving control of these fluxes across the boundaries surrounding the thermal plasma. Secondary discharges (hybrid plasma generators) and pulse modulation of the plasma have been some of the approaches for this end. The use of such methods is described for selected applications. Plasma characterization through advanced models and diagnostics are concentrating on description of plasma instabilities and various nonequilibrium conditions. Understanding of these effects will allow their use for enhanced processing methods.

APA, Harvard, Vancouver, ISO, and other styles

46

Ramakrishnan, S. "Technological Challenges in Thermal Plasma Production." Australian Journal of Physics 48, no. 3 (1995): 377. http://dx.doi.org/10.1071/ph950377.

Full text

Abstract:

Thermal plasmas, generated by electric arc discharges, are used in a variety of industrial applications. The electric arc is a constricted electrical discharge with a high temperature in the range 6000-25,000 K. These characteristics are useful in plasma cutting, spraying, welding and specific areas of material processing. The thermal plasma technology is an enabling process technology and its status in the market depends upon its advantages over competing technologies. A few technological challenges to enhance the status of plasma technology are to improve the utilisation of the unique characteristics of the electric arc and to provide enhanced control of the process. In particular, new solutions are required for increasing the plasma-material interaction, controlling the electrode roots and controlling the thermal power generated by the arcing process.

APA, Harvard, Vancouver, ISO, and other styles

47

Il’ichev, M. V., A. S. Tyuftyaev, and D. I. Yusupov. "Thermal cycle control at surface plasma treatment of high carbon steel." Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information, no. 12 (December 19, 2018): 81–88. http://dx.doi.org/10.32339/0135-5910-2018-12-81-88.

Full text

Abstract:

The problem of crack strength and wear resistance of metal products increase becomes particular significance in relation to continuously increasing requirement to their reliability and long service time. Traditional methods of volume strengthening of structure elements mainly exhausted their capacity. At the same time their resource, for example, under high wear conditions, is determined mainly by the structure and working surface properties and can be increased by application of plasma surface strengthening of metal products. Plasma surface strengthening of metal products is a typical of a technology covering spheres of plasma physics, hydrodynamics, theory of heat exchange, metal science. Complication of its mathematical simulation and digital calculation is stipulated by extensiveness of processes taking place: from crystal lattice scale till plasma treatment facility scale. By this reason experimental approach to solving a series of particular problems, enabling for optimizing plasma treatment facilities and technological process in the whole is important and actual. Results of influence study of outlet channel configuration of plasma treatment facility and treatment regimes on the structure and properties of metal surface after plasma thermal treatment presented. Forms of flow transformer outlet channel of plasmatron determined, providing the samples obtained demonstrated the highest level of surface hardness and wear resistance, during dry friction tests and wear test by semi-fixed abrasive material. It was shown, that change of the plasma treatment facility outlet channel configuration enables to effectively control the technological parameters (plasmatron travelling speed, plasmatron power and plasma-forming gas consumption), as well as the thermal cycle, which provides forming of required surface properties of treated detail. A basis of the results obtained based on the analysis of strengthened layer metal structure presented. Abrasion tests by a semi-fixed abrasive material showed, that surface plasma treatment gives a considerable wear resistance growth – up to 3 times comparing with a non-strengthened metal.

APA, Harvard, Vancouver, ISO, and other styles

48

Wang, Lingqian, Jiansong Zhou, Jun Liang, and Jianmin Chen. "Thermal control coatings on magnesium alloys prepared by plasma electrolytic oxidation." Applied Surface Science 280 (September 2013): 151–55. http://dx.doi.org/10.1016/j.apsusc.2013.04.115.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Kumar, Mukesh, Rajkumar, Dinesh Kumar, and A. K. Paul. "Thermal stability of tantalum nitride diffusion barriers for Cu metallization formed using plasma immersion ion implantation." Microelectronic Engineering 82, no. 1 (September 2005): 53–59. http://dx.doi.org/10.1016/j.mee.2005.06.001.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Łatka, Leszek, Lech Pawłowski, Marcin Winnicki, Pawel Sokołowski, Aleksandra Małachowska, and Stefan Kozerski. "Review of Functionally Graded Thermal Sprayed Coatings." Applied Sciences 10, no. 15 (July 27, 2020): 5153. http://dx.doi.org/10.3390/app10155153.

Full text

Abstract:

The paper briefly describes major thermal spray techniques used to spray functionally graded coatings such as atmospheric plasma spraying, high velocity oxy-fuel spraying, suspension and solution precursor plasma spraying, and finally low and high pressure cold gas spray method. The examples of combined spray processes as well as some examples of post spray treatment including laser and high temperature treatments or mechanical one, are described. Then, the solid and liquid feedstocks used to spray and their properties are shortly discussed. The reviewed properties of functional coatings include: (i) mechanical (adhesion, toughness, hardness); (ii) physical (porosity, thermal conductivity and diffusivity, thermal expansion, photo-catalytic activity), and; (iii) bioactivity and simulated body fluid (SBF) corrosion. These properties are useful in present applications of functionally graded coatings as thermal barriers, the bioactive coatings in prostheses, photo-catalytic coatings in water treatment, coatings used in printing industry (anilox and corona rolls). Finally, some of the future possible fields of functional thermal sprayed coatings applications are discussed, e.g., to coat polymer substrates or to use the cheap technology of low pressure cold gas spray method instead of expensive technology of vacuum plasma spraying to obtain bond coatings.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Thermal barriers (plasma control)'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles