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Journal articles on the topic 'Plasma sprayed'

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Published: 4 June 2021
Last updated: 1 February 2022

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1

Herman, Herbert. "Plasma-Sprayed Coatings." Scientific American 259, no. 3 (September 1988): 112–17. http://dx.doi.org/10.1038/scientificamerican0988-112.

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2

Wang, Liu Ying, Gu Liu, Han Gong Wang, and Shao Chun Hua. "Properties of Multi-Function Micro-Plasma Sprayed Nanostructured Al2O3-13wt%TiO2 Coatings." Key Engineering Materials 373-374 (March 2008): 59–63. http://dx.doi.org/10.4028/www.scientific.net/kem.373-374.59.

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Nonastructured Al2O3-13wt%TiO2 (AT13) coatings were deposited by multi-function micro-plasma spray and Metco 9M plasma spray, respectively. Constituent phases and the microstructure of the powder particles and coatings prepared were examined with the aid of scanning electronic microscope (SEM) and X-ray diffraction (XRD). Mechanical properties including hardness and bonding strength were also evaluated by microhardness tester and electron tensile tester. Multi-function micro plasma sprayed nanostructured AT13 Coating is fully-melted, dense and uniform. However, AT13 Coating deposited by Metco 9M plasma spray is partial-melted. The microhardness of multi-functional micro plasma sprayed AT13 Coating is HV975.7~1441.7, much higher than that of Metco 9M plasma sprayed AT13 Coating (HV655.3~946.6). The bonding strength results present the same, increased from 19.8 MPa to 42.7 MPa.
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3

Jech, David, Ladislav Čelko, Lenka Klakurková, Karel Slámečka, Miroslava Horynová, and Jiří Švejcar. "Formation of Thermally Sprayed Coatings on Grid-Like Structure Substrate." Solid State Phenomena 258 (December 2016): 387–90. http://dx.doi.org/10.4028/www.scientific.net/ssp.258.387.

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The main goal of this contribution is to investigate the influence of the substrate morphology on the resulting thermally sprayed coatings microstructure. Therefore, three different representative coating systems and/or thermal spray techniques were utilized to produce the coatings on grid-like structure substrates: (i) CoNiCrAlY bond coat (BC) sprayed by high velocity oxygen fuel (HVOF) technique and yttria stabilized zirconia (YSZ) top coat (TC) sprayed by means of atmospheric plasma spray (APS) technique, (ii) YSZ coating sprayed by means of APS and (iii) YSZ coating sprayed by means of nanoparticle colloid suspension plasma spraying (SPS). The shadowing effect of thermal spray coatings in relation with the grid-like substrate structure was investigated in detail. Resulting microstructure of sprayed samples was studied utilizing light microscopy, digital image analysis, scanning electron microscopy, energy-dispersive spectrometer and X-ray diffraction techniques.
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4

Kowalski, S., R. Belka, W. Żórawski, M. Sztorc, A. Góral, and M. Makrenek. "Microstructural study of plasma sprayed hydroxyapatite coatings." Journal of Achievements in Materials and Manufacturing Engineering 2, no. 83 (August 1, 2017): 79–84. http://dx.doi.org/10.5604/01.3001.0010.7035.

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Purpose: The aim of this study is to present microstructure and mechanical properties of hydroxyapatite coatings sprayed by means novel plasma system with axially injection of powder. Design/methodology/approach: Coatings were deposited with Axial III plasma spraying system and examined by SEM, XRD and by a nanoindentation technique (Nanovea) with a Berkovitz indenter. Surface of coatings was analysed by means of a Talysurf CCI-Lite non-contact 3D profiler. Findings: This study shows the microstructure and mechanical properties of hydroxyapatite coatings (HA) obtained by plasma spraying from the powder with a cauliflower-like high porous structure consisting of nanograins with dimension below 100 nm. The cross-section of plasma sprayed HA coating reveals lamellar structure containing pores in the interior of the lamellae. Moreover, between lamellae, some microcracks were detected. Hardness and elastic modulus measured by nanoindentation were found to be around 0.085 and 6.82 GPa respectively, what was comparable with HA coatings sprayed by a modified cold spray system. Both XRD patterns are practically identical, so no new phases were created in hydroxyapatite coating in comparison with feedstock powder during the spray process. High values of a geometry of HA coating; maximum peak height, maximum pit height and maximum height confirmed significant roughening of a surface, which is a result of the interaction of melted powder grains with the surfaces during the plasma spraying. Research limitations/implications: Obtained properties of coatings will be the base for comparison with suspension plasma sprayed coatings. Practical implications: Hydroxyapatite coatings deposited by means novel plasma system are designated for spraying implants. Originality/value: Properties of hydroxyapatite coatings plasma sprayed with novel axially injection of powder.
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5

Ahn, Jee Hoon, Eun Pil Song, Sung Hak Lee, and Nack J. Kim. "Wear Resistance of Plasma-Sprayed Al2O3-TiO2 Nanocoatings." Key Engineering Materials 345-346 (August 2007): 641–44. http://dx.doi.org/10.4028/www.scientific.net/kem.345-346.641.

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Wear resistance of Al2O3-8wt.%TiO2 coatings plasma-sprayed using nanopowders was investigated. Four types of nanostructured Al2O3-8wt.%TiO2 powders were plasma-sprayed on a low-carbon steel substrate by using different critical plasma spray parameters (CPSP). The coatings consisted of completely melted and partially melted regions. The hardness of the coatings increased with increasing CPSP, while the wear resistance was the highest for the coating sprayed with the lowest CPSP. The main wear mechanism was a delamination mode in the coating sprayed with the high CPSP, but was changed to an abrasive mode in the coating sprayed with the low CPSP. According to this change in the wear mechanism, the wear resistance was the best in the coating sprayed with lowest CPSP, while its hardness was lowest.
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6

Thirumalaikumarasamy, D., V. Balasubramanian, S. Sree Sabari, R. Rajesh, and Medha R. Elayidom. "Predicting the Deposition Efficiency of Plasma Sprayed Alumina Coatings on AZ31B Magnesium Alloy by Response Surface Methodology." Applied Mechanics and Materials 877 (February 2018): 66–81. http://dx.doi.org/10.4028/www.scientific.net/amm.877.66.

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Plasma sprayed ceramic coatings are successfully employed in many industrial applications, where high wear and corrosion resistance with thermal insulation are needed. Plasma spray parameters such as power, stand-off distance and powder feed rate have significant influence on coating characteristics like deposition efficiency. This paper presents the use of statistical techniques specially response surface methodology (RSM), analysis of variance, and regression analysis to develop empirical relationships to predict deposition efficiency of plasma sprayed alumina coatings on AZ31B magnesium alloy. The developed empirical relationships can be efficiently used to predict deposition efficiency of plasma sprayed alumina coatings at 95% confidence level. Response graphs and contour plots were constructed to identify the optimum plasma spray parameters to attain maximum deposition efficiency in alumina coatings. Further, correlating the spray parameters with coating properties permits the identification of characteristics regime to achieve desired quality of coatings.
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7

Antoš, Jakub, Petra Šulcová, Kateřina Lencová, Šárka Houdková, Josef Duliškovic, Jan Hajšman, Karolína Burdová, and Antonín Račický. "LOCAL MECHANICAL PROPERTIES OF ATMOSPHERIC SPRAYED MOLYBDENUM COATINGS DEPOSITED WITH CASCADED PLASMA TORCH." Acta Polytechnica CTU Proceedings 27 (June 11, 2020): 32–36. http://dx.doi.org/10.14311/app.2020.27.0032.

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Increasing interest for industrial use of thermally sprayed coatings leads to development in most thermal spraying technologies, including atmospheric plasma spraying (APS). The latest cascaded torch SinplexPro from Oerlikon Metco incorporates the efficiency advantages of cascaded arc technology into a single-cathode spray gun. It leads to more stable plasma arc across a wide range of gas flows, mixtures and pressures and also highly increases powder throughput. Thermal sprayed molybdenum coatings are widely used for improving wear resistance and sliding properties in many mechanical applications. Results of pure molybdenum coatings sprayed with cascaded plasma torch are not yet fully investigated. In this paper, mechanical properties of atmospheric plasma sprayed molybdenum coatings on steel (S235) substrate are evaluated. Optimization of spraying parameters for spherical Mo powder sprayed by cascaded plasma torch SinplexPro is carried out and the influence on final microstructure, mechanical and tribological properties of molybdenum coatings is analysed.
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8

Kumar, K., and D. Das. "Aligned, plasma sprayed SmCo5deposits." Journal of Applied Physics 60, no. 10 (November 15, 1986): 3779–81. http://dx.doi.org/10.1063/1.337542.

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9

Elam, W. T., J. P. Kirkland, R. A. Neiser, E. F. Skelton, S. Sampath, and H. Herman. "PLASMA SPRAYED HIGH TcSUPERCONDUCTORS." Advanced Ceramic Materials 2, no. 3B (July 1987): 411–21. http://dx.doi.org/10.1111/j.1551-2916.1987.tb00105.x.

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10

Konaka, T., I. Sankawa, T. Higashi, and K. Ishihara. "Plasma sprayed highTcoxide superconductors." Ferroelectrics 92, no. 1 (April 1989): 123–28. http://dx.doi.org/10.1080/00150198908211316.

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11

Overfelt, R. A., C. D. Anderson, and W. F. Flanagan. "Plasma sprayed Fe76Nd16B8permanent magnets." Applied Physics Letters 49, no. 26 (December 29, 1986): 1799–801. http://dx.doi.org/10.1063/1.97195.

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12

SCAGLIOTTI, M. "Plasma-sprayed zirconia electrolytes." Solid State Ionics 28-30 (September 1988): 1766–69. http://dx.doi.org/10.1016/0167-2738(88)90458-4.

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13

Neiser, R. A., J. P. Kirkland, H. Herman, W. T. Elam, and E. F. Skelton. "Plasma sprayed superconducting oxides." Materials Science and Engineering 91 (July 1987): L13—L15. http://dx.doi.org/10.1016/0025-5416(87)90313-2.

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14

Ilavsky, J., J. Forman, and P. Chraska. "Plasma-sprayed aluminium coating." Journal of Materials Science Letters 11, no. 9 (1992): 573–74. http://dx.doi.org/10.1007/bf00728612.

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15

Blinkov, I. V., D. S. Belov, A. I. Laptev, A. S. Anikeev, and V. V. Ivanov. "Flame sprayed and plasma sprayed Al2O3-TiO2 coatings." Journal of Physics: Conference Series 1954, no. 1 (June 1, 2021): 012003. http://dx.doi.org/10.1088/1742-6596/1954/1/012003.

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16

Ahmad, Zaki, and M. Ahsan. "Environmental Response of Plasma Sprayed Nanostructured Coatings." Advanced Materials Research 32 (February 2008): 65–70. http://dx.doi.org/10.4028/www.scientific.net/amr.32.65.

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Erosion corrosion and environmental chamber corrosion studies conducted on plasma sprayed samples from three different spray dried and densified nanopowders showed good resistance to corrosion. A dense, uniform and even distribution of splats and small number of microvoids and pores offered a high resistance to erosion-corrosion in sodium chloride polystyrene slurry. The coatings offer a high resistance in salt spray chamber environment.
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17

Ong, Joo L., David L. Carnes, and Kazuhisa Bessho. "Evaluation of titanium plasma-sprayed and plasma-sprayed hydroxyapatite implants in vivo." Biomaterials 25, no. 19 (August 2004): 4601–6. http://dx.doi.org/10.1016/j.biomaterials.2003.11.053.

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18

Ahmed, I., and T. L. Bergman. "Optimization of Plasma Spray Processing Parameters for Deposition of Nanostructured Powders for Coating Formation." Journal of Fluids Engineering 128, no. 2 (March 1, 2006): 394–401. http://dx.doi.org/10.1115/1.2170131.

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When nanostructured powder particles are used for thermal spray coatings, the retention of the original nanostructure that is engineered into the raw stock is a principal objective, along with production of some molten material in order to adhere the sprayed material to the surface being coated. Therefore, in contrast with spraying conventional powders, complete melting of the nanostructured raw stock is to be avoided. In this study, the melting and resolidification of sprayed material is correlated to a spray processing parameter that has been introduced in the literature by some of the spray processing practitioners. Using computer modeling, processing of zirconia agglomerates with plasma spraying has been simulated. Transition regions for the phase change response of the sprayed material to the thermal processing conditions are identified. The retained nanostructure content and liquid fraction of the sprayed material are correlated to particle diameters, injection velocities, as well as this thermal spray processing parameter. Finally, a novel method to produce desired coatings composed of partially molten material using a bimodal particle size distribution of the sprayed powder is suggested.
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19

Wu, Chengtie, Yogambha Ramaswamy, Xuanyong Liu, Guocheng Wang, and Hala Zreiqat. "Plasma-sprayed CaTiSiO 5 ceramic coating on Ti-6Al-4V with excellent bonding strength, stability and cellular bioactivity." Journal of The Royal Society Interface 6, no. 31 (July 29, 2008): 159–68. http://dx.doi.org/10.1098/rsif.2008.0274.

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Novel Ca-Si-Ti-based sphene (CaTiSiO 5 ) ceramics possess excellent chemical stability and cytocompatibility. The aim of this study was to prepare sphene coating on titanium alloy (Ti-6Al-4V) for orthopaedic applications using the plasma spray method. The phase composition, surface and interface microstructure, coating thickness, surface roughness and bonding strength of the plasma-sprayed sphene coating were analysed using X-ray diffraction, scanning electron microscopy, atomic force microscopy and the standard mechanical testing of the American Society for Testing and Materials, respectively. The results indicated that sphene coating was obtained with a uniform and dense microstructure at the interface of the Ti-6Al-4V surface and the thickness and surface roughness of the coating were approximately 150 and 10 μm, respectively. Plasma-sprayed sphene coating on Ti-6Al-4V possessed a significantly improved bonding strength and chemical stability compared with plasma-sprayed hydroxyapatite (HAp) coating. Plasma-sprayed sphene coating supported human osteoblast-like cell (HOB) attachment and significantly enhanced HOB proliferation and differentiation compared with plasma-sprayed HAp coating and uncoated Ti-6Al-4V. Taken together, plasma-sprayed sphene coating on Ti-6Al-4V possessed excellent bonding strength, chemical stability and cellular bioactivity, indicating its potential application for orthopaedic implants.
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20

Lee, Soo Wohn, Jia Zhang, Huang Chen, J. S. Song, Jae Kyo Seo, Zeng Yi, and Tohru Sekino. "Residual Stress Measurement of Plasma Sprayed Coating Layers in ZrO2." Materials Science Forum 544-545 (May 2007): 451–54. http://dx.doi.org/10.4028/www.scientific.net/msf.544-545.451.

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Plasma sprayed coatings have been widely applied in modifying surface properties of metal components. It is also useful to prevent various types of wear, corrosion, erosion and thermal. But the residual stress is still an important problem which can effect the properties of sprayed coating. So it’s necessary to find out the reason of residual stress and the relationship between plasma sprayed condition and residual stress. Plasma spray coating layers with conventional ZrO2 powder was examined to calculate residual stress by X-ray diffraction method with various coating thickness.
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21

Zhou, Hong, Zhi Liu, and Liancong Luo. "Microstructural Characterization of Shrouded Plasma-Sprayed Titanium Coatings." Journal of Manufacturing and Materials Processing 3, no. 1 (January 10, 2019): 4. http://dx.doi.org/10.3390/jmmp3010004.

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Titanium and its alloys are often used for corrosion protection because they are able to offer high chemical resistance against various corrosive media. In this paper, shrouded plasma spray technology was applied to produce titanium coatings. A solid shroud with an external shrouding gas was used to plasma spray titanium powder feedstock with aim of reducing the oxide content in the as-sprayed coatings. The titanium coatings were assessed by optical microscope, scanning electron microscopy, X-ray diffraction, LECO combustion method and Vickers microhardness testing. The results showed that the presence of the shroud and the external shrouding gas led to a dense microstructure with a low porosity in the plasma-sprayed titanium coatings. The oxygen and nitrogen contents in the titanium coating were kept at a low level due to the shielding effect of the shroud attachment and the external shrouding gas. The dominant phase in the shrouded titanium coatings was mainly composed of α-Ti phase, which was very similar to the titanium feedstock powders. The shrouded plasma-sprayed titanium coatings had a Vickers microhardness of 404.2 ± 103.2 HV.
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22

Ding, Kan, Hiroyuki Sasahara, Syuji Adachi, and Kimio Nishimura. "Investigation on the Cutting Process of Plasma Sprayed Iron Base Alloys." Key Engineering Materials 447-448 (September 2010): 821–25. http://dx.doi.org/10.4028/www.scientific.net/kem.447-448.821.

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In the recent years, the current technology enables only the molten iron base alloys, sprayed on the aluminum alloy engine block thus it can function as a cylinder bore. However, the machinability performance of plasma spray coated cylinder bore in boring process is poor because of severe tool wear compared with the previous cast iron cylinder bore. This paper deals with the results obtained at boring process of plasma sprayed iron base alloys coating to clarify the root cause of tool wear. Preliminary fine boring and turning experiments are conducted on the plasma sprayed cylinder bore, and tool wear, tool failure modes and cutting force were also investigated. The result shows plasma spray coated cylinder bore recorded larger cutting force than the cast iron cylinder bore. Also, this work shows that abrasive effect by the hard oxide particles on the cross-sectioned of machined layer is superior when fine boring plasma spraying iron base alloys coating.
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23

Heimann, Robert B., Horst J. Pentinghaus, and Richard Wirth. "Plasma-sprayed 2:1-mullite coatings deposited on aluminium substrates." European Journal of Mineralogy 19, no. 2 (April 26, 2007): 281–91. http://dx.doi.org/10.1127/0935-1221/2007/0019-1716.

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24

Pinto, M. A., W. R. Osório, C. R. P., A. García, and M. C. F. Ierardi. "Laser surface treatment of plasma-sprayed yttria-stabilized zirconia coatings." Revista de Metalurgia 41, Extra (December 17, 2005): 154–59. http://dx.doi.org/10.3989/revmetalm.2005.v41.iextra.1016.

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25

Wu, Wei Qin, Qiang Li, Zhen Yi Wei, and Hui Ye. "Microstructure and Abrasive Wear Properties of Plasma Sprayed Nanostructured Al2O3-TiO2-ZrO2-CeO2 Coatings." Advanced Materials Research 291-294 (July 2011): 117–24. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.117.

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Al2O3-TiO2-ZrO2-CeO2 coatings formed via a plasma spray approach. The optimal spray parameters of plasma sprayed nano-structured coating were determined by orthogonal experimental design, based on porosity, bond strength of the coatings and the partly melted(PM) zone percentage. Microstructure of the plasma sprayed nanostructured Al2O3-TiO2-ZrO2-CeO2 coating sprayed on the optimal spray parameters was analyzed. Wear map was established by wear experiments. The results show, nanostructured coating contains fully melted (FM) zone and PM zone, the increasing of the critical plasma spray parameter (CPSP) promote the decreasing of the PM zone percentage and the increasing of the bond strength of the coatings. The composition phases of the powder reacted to each other during the plasma spraying process. FM and PM zone resulted from fully melted droplets and partly melted particles respectively. Nanosized crystals and amorphous particles exist in the PM zone, liquid phase sintering is taken place in the PM zone. The main wear mechanism of plasma spraying coatings are plastic deformation and microplow, microfracture and grain spalling, fracture and delamination at different normal load and sliding speed in dry friction.
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26

Yoon, Sang-Hoon, June-Seob Kim, Soo-Ki Kim, and Chang-Hee Lee. "Vacuum Plasma Sprayed NiTiZrSiSn Coating." Journal of the Korean Welding and Joining Society 25, no. 4 (August 31, 2007): 42–48. http://dx.doi.org/10.5781/kwjs.2007.25.4.042.

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27

TAKAHASHI, Satoru. "Plasma Sprayed Thermal Barrier Coatings." Journal of the Surface Finishing Society of Japan 63, no. 5 (2012): 301. http://dx.doi.org/10.4139/sfj.63.301.

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28

Ozyegin, L. Sevgi, Faik N. Oktar, Gultekin Goller, E. Sabri Kayali, and Tokay Yazici. "Plasma-sprayed bovine hydroxyapatite coatings." Materials Letters 58, no. 21 (August 2004): 2605–9. http://dx.doi.org/10.1016/j.matlet.2004.03.033.

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29

Gowtham Sanjai, S., Ratan Pinto, and Parvati Ramaswamy. "Plasma sprayed nano refractory coatings." IOP Conference Series: Materials Science and Engineering 577 (December 7, 2019): 012100. http://dx.doi.org/10.1088/1757-899x/577/1/012100.

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30

De Groot, K., R. Geesink, C. P. A. T. Klein, and P. Serekian. "Plasma sprayed coatings of hydroxylapatite." Journal of Biomedical Materials Research 21, no. 12 (December 1987): 1375–81. http://dx.doi.org/10.1002/jbm.820211203.

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31

Sampath, S., G. A. Bancke, H. Herman, and S. Rangaswamy. "Plasma Sprayed Ni–Al Coatings." Surface Engineering 5, no. 4 (January 1989): 293–98. http://dx.doi.org/10.1179/sur.1989.5.4.293.

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32

Wen, Lishi, Shengwei Qian, Qingyu Hu, Baohai Yu, Hangwei Zhao, Guan Kan, Lishun Fu, and Qiaoqin Yang. "Plasma Sprayed High-Tc Superconductor." International Journal of Modern Physics B 01, no. 02 (June 1987): 263–65. http://dx.doi.org/10.1142/s0217979287000293.

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33

Karthikeyan, J., K. P. Sreekumar, M. B. Kurup, D. S. Patil, P. V. Anantapadmanabhan, N. Venkatramani, and V. K. Rohatgi. "Plasma sprayed superconducting Y1Ba2Cu3O7-xcoatings." Journal of Physics D: Applied Physics 21, no. 7 (July 14, 1988): 1246–49. http://dx.doi.org/10.1088/0022-3727/21/7/033.

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34

Varacalle, D. J., H. Herman, G. A. Bancke, T. D. Burchell, and G. R. Romanoski. "Vacuum-plasma-sprayed silicon coatings." Surface and Coatings Technology 49, no. 1-3 (December 1991): 24–30. http://dx.doi.org/10.1016/0257-8972(91)90026-s.

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35

Fauchais, P. "Formation of plasma sprayed coatings." Journal of Thermal Spray Technology 4, no. 1 (March 1995): 3–6. http://dx.doi.org/10.1007/bf02648521.

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36

Patil, D. S., K. P. Sreekumar, N. Venkataramani, R. K. Iyer, Ram Prasad, R. S. Koppikar, and K. R. Munim. "Plasma sprayed hydroxy apatite coatings." Bulletin of Materials Science 19, no. 1 (February 1996): 115–21. http://dx.doi.org/10.1007/bf02744793.

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37

Kalita, V. I., A. A. Radyuk, D. I. Komlev, A. B. Mikhailova, A. V. Alpatov, D. D. Titov, and M. I. Alymov. "Plasma-Sprayed TiC-Based Cermets." Inorganic Materials: Applied Research 12, no. 2 (March 2021): 461–67. http://dx.doi.org/10.1134/s2075113321020210.

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38

Odhiambo, John Gerald, WenGe Li, YuanTao Zhao, and ChengLong Li. "Porosity and Its Significance in Plasma-Sprayed Coatings." Coatings 9, no. 7 (July 23, 2019): 460. http://dx.doi.org/10.3390/coatings9070460.

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Porosity in plasma-sprayed coatings is vital for most engineering applications. Porosity has its merits and demerits depending on the functionality of the coating and the immediate working environment. Consequently, the formation mechanisms and development of porosity have been extensively explored to find out modes of controlling porosity in plasma-sprayed coatings. In this work, a comprehensive review of porosity on plasma-sprayed coatings is established. The formation and development of porosity on plasma-sprayed coatings are governed by set spraying parameters. Optimized set spraying parameters have been used to achieve the most favorable coatings with minimum defects. Even with the optimized set spraying parameters, defects like porosity still occur. Here, we discuss other ways that can be used to control porosity in plasma-sprayed coating with emphasis to atmospheric plasma-sprayed chromium oxide coatings. Techniques like multilayer coatings, nanostructured coatings, doping with rare earth elements, laser surface re-melting and a combination of the above methods have been suggested in adjusting porosity. The influences of porosity on microstructure, properties of plasma-sprayed coatings and the measurement methods of porosity have also been reviewed.
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39

Wang, You, D. L. Wang, G. Liu, W. Tian, and C. H. Wang. "The Influence of Powder Types and Plasma Spray Conditions on Abrasive Wear of Nanostructured and Conventional Al2O3/TiO2 Coatings." Materials Science Forum 539-543 (March 2007): 1294–99. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.1294.

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In this paper, Al2O3/TiO2 coatings via thermal spray approach using three different feedstock powders, i.e., (a) reconstituted nanosized Al2O3/TiO2 feedstock powders, (b) reconstituted nanosized Al2O3/TiO2/ZrO2/CeO2 feedstock powders and (c) conventional Al2O3/TiO2 feedstock powders are described. Effects of different powder types and various plasma spray conditions on the density, microhardness and crack resistance, especially on the abrasive wear behavior of the coatings have been evaluated. The result showed that the coatings sprayed using different feedstock powders exhibit different abrasive wear behavior with changing the plasma spray conditions. The coatings sprayed using the reconstituted nanosized Al2O3/TiO2/ZrO2/CeO2 feedstock powders showed a significantly improved wear resistance compared to the coatings sprayed using reconstituted nanosized Al2O3/TiO2 feedstock powders or conventional Al2O3/TiO2 feedstock powders. The wear mechanisms of the coatings were discussed.
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40

Zhu, Sheng, and Bin Shi Xu. "High-Performance Ceramic Coatings Sprayed via Novel Supersonic Plasma Spraying System." Key Engineering Materials 280-283 (February 2007): 1203–6. http://dx.doi.org/10.4028/www.scientific.net/kem.280-283.1203.

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A novel supersonic plasma spraying system was developed with a maximum power of 80 kW and a maximum working gas flow of 6 m3/h, at which gas and particle velocities of 2400 and 600 m/s can be achieved respectively. This paper deals with novel supersonic plasma spraying system design, the structure of novel supersonic plasma gun includes a special Laval nozzle as the single anode and inner powder supply, and the mechanisms of supersonic plasma jet as well as the effects on the sprayed particles. The spraying process parameters of several ceramic powders such as Al2O3, Cr2O3, ZrO2, Cr3C2 and Co-WC were optimized. The properties and microstructure of the sprayed ceramic coatings were investigated. Nano Al2O3-TiO2 ceramic coating sprayed by using novel supersonic plasma spraying was also studied. Novel supersonic plasma spraying improves greatly ceramic coatings quality compared with conventional air plasma spraying (Metco 9M), as well as it has lower energy and gas exhaustion compared with high power supersonic plasma spraying (Plazjet), which can spray high-performance ceramic coatings at low cost.
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41

Herman, Herbert. "Plasma Spray Deposition Processes." MRS Bulletin 13, no. 12 (December 1988): 60–67. http://dx.doi.org/10.1557/s0883769400063715.

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The concept of plasma is central to many scientific and engineering disciplines—from the design of neon advertisement lights to fusion physics. Plasmas vary from low density, slight states of ionization (outer space) to dense, thermal plasmas (for extractive metallurgy). And plasmas are prominent in a wide range of deposition processes — from nonthermal plasma-activated processes to thermal plasmas, which have features of flames and which can spray-deposit an enormous variety of materials. The latter technique, arc plasma spraying (or simply, plasma spraying) is evolving rapidly as a way to deposit thick films (>30 μm) and also freestanding forms.This article will review the technology of plasma spraying and how various scientific disciplines are contributing to both an understanding and improvement of this complex process.The plasma gun dates back to the 1950s, when it was introduced for the deposition of alloys and ceramics. Due to its high temperature flame it was quickly discovered that plasmas could be used for depositing refractory oxides as rocket nozzle liners or to fabricate missile nose cones. In the latter technique, the oxide (e.g., zirconia-based ceramics, spinel) was sprayed onto a mandrel and the deposited material was later removed as a free-standing form.The technique's versatility has attracted considerable industrial attention. Modern high performance machinery is commonly subjected to extremes of temperature and mechanical stress, to levels beyond the capabilities of present-day materials. It is becoming increasingly common to form coatings on such material surfaces to protect against high temperature corrosive media and to enhance mechanical wear and erosion resistance. Several thousand parts within an aircraft gas turbine engine have protective coatings, many of them plasma sprayed. In fact, plasma spraying has emerged as a major means to apply a wide range of materials on diverse substrates. The process can be readily carried out in air or in environmental chambers and requires very little substrate surface preparation. The rate of deposit buildup is rapid and the costs are sufficiently low to enable widening applications for an ever increasing variety of industries.
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42

Itoh, Y., M. Saitoh, and M. Tamura. "Characteristics of MCrAlY Coatings Sprayed by High Velocity Oxygen-Fuel Spraying System." Journal of Engineering for Gas Turbines and Power 122, no. 1 (July 30, 1999): 43–49. http://dx.doi.org/10.1115/1.483173.

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High velocity oxygen-fuel (HVOF) spraying system in open air has been established for producing the coatings that are extremely clean and dense. It is thought that the HVOF sprayed MCrAlY (M is Fe, Ni and/or Co) coatings can be applied to provide resistance against oxidation and corrosion to the hot parts of gas turbines. Also, it is well known that the thicker coatings can be sprayed in comparison with any other thermal spraying systems due to improved residual stresses. However, thermal and mechanical properties of HVOF coatings have not been clarified. Especially, the characteristics of residual stress, that are the most important property from the view point of production technique, have not been made clear. In this paper, the mechanical properties of HVOF sprayed MCrAlY coatings were measured in both the case of as-sprayed and heat-treated coatings in comparison with a vacuum plasma sprayed MCrAlY coatings. It was confirmed that the mechanical properties of HVOF sprayed MCrAlY coatings could be improved by a diffusion heat treatment to equate the vacuum plasma sprayed MCrAlY coatings. Also, the residual stress characteristics were analyzed using a deflection measurement technique and a X-ray technique. The residual stress of HVOF coating was reduced by the shot-peening effect comparable to that of a plasma spray system in open air. This phenomena could be explained by the reason that the HVOF sprayed MCrAlY coating was built up by poorly melted particles. [S0742-4795(00)00701-8]
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43

Moreau, C., J. F. Bisson, R. S. Lima, and B. R. Marple. "Diagnostics for advanced materials processing by plasma spraying." Pure and Applied Chemistry 77, no. 2 (January 1, 2005): 443–62. http://dx.doi.org/10.1351/pac200577020443.

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Advanced coatings deposited by plasma spraying are used in a large variety of industrial applications. The sprayed coatings are employed typically in industry to protect parts from severe operating conditions or to produce surfaces with specific functions. Applications are found in many industrial sectors such as aerospace, automobile, energy generation, and biomedical implants.Coatings are built by the successive deposition of molten or partially molten particles that flatten and solidify upon contact on the substrate, forming lamellae. The coating properties are intimately linked to the properties of these lamellae, which in turn depend on in-flight particle properties as well as substrate temperature during spraying. Consequently, the development of diagnostic tools for monitoring and controlling these spray parameters will help provide the necessary information to study the coating formation process, optimize the coating properties, and, eventually, control the spray process in production.In this paper, a review of some recent developments of optical diagnostic techniques applied to monitor plasma-sprayed particles is presented. In the first part of the paper, two different sensing techniques for in-flight particle measurement are described. First, time-resolved diagnostics on individual particles is described. This technique is used to study the instabilities of the particle characteristics associated with the plasma fluctuations. Secondly, a technique adapted for use in an industrial production environment for measuring the particle jet characteristics as an ensemble is presented. In the second part of the paper, the use of an optical system to study the influence of the substrate temperature on the flattening and solidification of sprayed particles impacting on a flat substrate is described. The last part of this paper describes the optimization of nanostructured coatings based on a tight control of the temperature and velocity of the plasma-sprayed particles.
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44

Di Ferdinando, Martina, Alessio Fossati, Alessandro Lavacchi, Ugo Bardi, Francesca Borgioli, Claudia Borri, Carlo Giolli, and Andrea Scrivani. "Isothermal oxidation resistance comparison between air plasma sprayed, vacuum plasma sprayed and high velocity oxygen fuel sprayed CoNiCrAlY bond coats." Surface and Coatings Technology 204, no. 15 (April 2010): 2499–503. http://dx.doi.org/10.1016/j.surfcoat.2010.01.031.

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45

Liao, Rong, Hong Sheng Wang, Chong Hai Wang, Chang Lin Zhou, Jian Liu, and Qi Hon Wei. "Effect of ZrO2 Coating on the Properties of Porous Silicon Nitride." Advanced Materials Research 833 (November 2013): 189–92. http://dx.doi.org/10.4028/www.scientific.net/amr.833.189.

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The powder of 3molY2O3-ZrO2 as the coating material sprayed on the surface of porous silicon nitride which porosity is more than 50% by Plasma Sprayed. The microstructure of the coating and the matrix was analysised. The performance change of porosity, strength and insulation, before and after spray, were researched.
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46

Jones, John D., Makato Saigusa, Joseph E. Van Sickels, Billy Don Tiner, and Wayne A. Gardner. "Clinical evaluation of hydroxyapatite-coated titanium plasma-sprayed and titanium plasma-sprayed cylinder dental implants." Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology 84, no. 2 (August 1997): 137–41. http://dx.doi.org/10.1016/s1079-2104(97)90058-5.

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47

Chen, Dianying, Aaron Pegler, Gopal Dwivedi, Daniel De Wet, and Mitchell Dorfman. "Thermal Cycling Behavior of Air Plasma-Sprayed and Low-Pressure Plasma-Sprayed Environmental Barrier Coatings." Coatings 11, no. 7 (July 20, 2021): 868. http://dx.doi.org/10.3390/coatings11070868.

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Yb2Si2O7/Si environmental barrier coatings (EBCs) were produced by air plasma spray (APS) and low-pressure plasma spray (LPPS) processes. The phase composition, microstructure, and bonding strength of APS and LPPS EBCs were investigated. Thermal cycling tests were performed in air and in steam atmosphere respectively at 1316 °C for both APS and LPPS EBCs. There is no coating failure in air atmosphere for both APS and LPPS EBCs after 900 cycles. In contrast, APS EBCs have an average life of 576 cycles in a steam cycling test in 90% H2O + 10% air at 1316 °C while LPPS EBCs survived 1000 cycles without failure. The superior durability of the LPPS EBCs compared to APS EBCs in the same steam cycling environment is attributed to the significantly reduced thermally grown oxide (TGO) growth rate because of the denser and crack-free microstructure, higher bonding strength, and reduced coefficient of thermal expansion (CTE) mismatch (less Yb2SiO5 phase) in the LPPS Yb2Si2O7/Si EBCs.
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48

Hanada, Kotaro, and Hitomi Yamaguchi. "Development of Spherical Iron-Based Composite Powder with Carried Alumina Abrasive Grains by Plasma Spray." Advanced Materials Research 75 (June 2009): 43–46. http://dx.doi.org/10.4028/www.scientific.net/amr.75.43.

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This paper describes the development of spherical iron-based composite powder with carried alumina abrasive grains made by a plasma spray technique. Carbonyl iron powder (7.2 μm average size) and alumina abrasive grains (0.3 μm average size) are sprayed into the plasma flame from the respective nozzles simultaneously, or their mechanical mixture is directly plasma-sprayed. In case of the composite powder obtained by the direct spray method, the alumina abrasives are well carried on the carbonyl iron particles. However, a plasma current of more than 100 A causes melting and vaporizing of the alumina abrasives;, consequently the carbonyl iron and alumina abrasives are separated. The magnetic abrasive experiments with the composite powder developed are made for SUS304 stainless steel plate, and the result shows that the developed composite powder has high potential abrasive performance.
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49

LeGeros, Racquel Z., and John P. LeGeros. "In Situ Characterization of Degradation Behavior of Plasma-Sprayed Coatings on Orthopedic and Dental Implants." Advances in Science and Technology 49 (October 2006): 203–11. http://dx.doi.org/10.4028/www.scientific.net/ast.49.203.

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Plasma-sprayed ‘HA’ coatings on commercial orthopedic and dental implants were developed to combine the strength of the metal (Ti or Ti alloy) and the bioactivity of the hydroxyapatite (HA). Several studies have shown that ‘HA’-coated implants provided greater amount of bone attachment, higher bone-implant interfacial strength and accelerated skeletal attachment. However, some reports on implant failures have been attributed to coating delamination and coating early resorption of the plasma sprayed ‘HA’ coating. This paper reviews studies on characterization and degradation of plasma-sprayed ‘HA’ coatings on orthopedic and dental implants and offers alternatives to plasma-spray method of providing calcium phosphate coating. X-ray diffraction analyses showed that plasma-sprayed HA coating consists principally of HA and amorphous calcium phosphate (ACP) with minor amounts of other resorbable calcium phosphates (α- or β-tricalcium phosphates, tetracalcium phosphate), sometimes calcium oxide. The HA/ACP ratios were found to range from 20HA/80ACP to 70HA/30ACP in coated implants from different manufacturers. In vitro initial dissolution rates in acidic buffer (pH 6, 37oC) increased with decreasing HA/ACP ratios in the coating because of the preferential dissolution of the ACP phase. These results suggest that coating with very low HA/ACP ratio may result in the premature resorption of the coating before the bone can attach to the implant thus causing loosening and eventual failure of the implant. Alternatives to plasma-sprayed ‘HA’ are implant surface modifications and low temperature calcium phosphate coatings using electrochemical deposition method or precipitation method.
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50

Laha, T., Y. Liu, and A. Agarwal. "Carbon Nanotube Reinforced Aluminum Nanocomposite via Plasma and High Velocity Oxy-Fuel Spray Forming." Journal of Nanoscience and Nanotechnology 7, no. 2 (February 1, 2007): 515–24. http://dx.doi.org/10.1166/jnn.2007.114.

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Free standing structures of hypereutectic aluminum-23 wt% silicon nanocomposite with multiwalled carbon nanotubes (MWCNT) reinforcement have been successfully fabricated by two different thermal spraying technique viz Plasma Spray Forming (PSF) and High Velocity Oxy-Fuel (HVOF) Spray Forming. Comparative microstructural and mechanical property evaluation of the two thermally spray formed nanocomposites has been carried out. Presence of nanosized grains in the Al–Si alloy matrix and physically intact and undamaged carbon nanotubes were observed in both the nanocomposites. Excellent interfacial bonding between Al alloy matrix and MWCNT was observed. The elastic modulus and hardness of HVOF sprayed nanocomposite is found to be higher than PSF sprayed composites.
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