Relevant bibliographies by topics / Water-stabilized plasma spray

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  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'Water-stabilized plasma spray'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 February 2022

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Journal articles on the topic "Water-stabilized plasma spray"

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Chraska, Pavel, Jan Ilavsky, and Herbert Herman. "Water-Stabilized Plasma Spray Technology Offers Higher Production Rates at Lower Cost." Materials Technology 13, no. 2 (January 1998): 56–58. http://dx.doi.org/10.1080/10667857.1998.11752767.

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Ctibor, Pavel, Micheala Kašparová, Jeremy Bellin, Emmanuel Le Guen, and František Zahálka. "Plasma Spraying and Characterization of Tungsten Carbide-Cobalt Coatings by the Water-Stabilized System WSP." Advances in Materials Science and Engineering 2009 (2009): 1–11. http://dx.doi.org/10.1155/2009/254848.

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Tungsten carbide-cobalt powders (WC-17wt% Co) were plasma sprayed by a water-stabilized system WSP. Experiments with variable feeding distances and spray distances were carried out. Thinner coatings were deposited on carbon steel substrates and thicker coatings on stainless steel substrates to compare different cooling conditions. Basic characterization of coatings was done by XRD, SEM, and light microscopy plus image analysis. Microhardness was measured on polished cross-sections. The main focus of investigation was resistance against wear in dry as well as wet conditions. The appropriate tests were performed with set-ups based on ASTM G65 and G75, respectively. The influence of spray parameters onto coating wear performance was observed. The results of mechanical tests were discussed in connection with changes of phase composition and with the quality of the coating's microstructure. The results show that for obtaining the best possible WC-17Co coating with WSP process, from the viewpoint of wear resistance, the desired parameters combination is long feeding distance combined with short spray distance.
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Pham, Duy Quang, Christopher C. Berndt, Jan Cizek, Uwe Gbureck, Hala Zreiqat, Zufu Lu, and Andrew Siao Ming Ang. "Baghdadite coating formed by hybrid water-stabilized plasma spray for bioceramic applications: Mechanical and biological evaluations." Materials Science and Engineering: C 122 (March 2021): 111873. http://dx.doi.org/10.1016/j.msec.2021.111873.

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Ctibor, Pavel, and Milan Hrabovský. "Dependence of Particle Parameters in Flight and Coating Character on Power of the Electric Supply at Plasma Spraying of TiO2." Key Engineering Materials 434-435 (March 2010): 779–82. http://dx.doi.org/10.4028/www.scientific.net/kem.434-435.779.

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The influence of input power on the spayed powder and final coating was quantified for particular case of water-stabilized plasma spray torch (WSP®) and ceramic coating formed from titanium dioxide (TiO2). All other spray setup parameters were fixed during the experiment with electric supply power as the only variable factor. In-flight particles were characterized by Doppler particle velocimetry, microstructure of the coatings was observed by microscopic techniques and computer image analysis and phase composition was studied by X-ray diffraction. Various mechanical properties were measured – microhardness, surface roughness and wear resistance in a slurry. The results indicate that the higher power means better coating quality – its microstructure and mechanical performance. This substantial difference has the same trend for both power supplies utilized for the testing.
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Luzin, Vladimir, Jiří Matějíček, and Thomas Gnäupel-Herold. "Through-Thickness Residual Stress Measurement by Neutron Diffraction in Cu+W Plasma Spray Coatings." Materials Science Forum 652 (May 2010): 50–56. http://dx.doi.org/10.4028/www.scientific.net/msf.652.50.

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A range of different spraying techniques can be used to coat the surfaces of engineering components. These techniques are based on different principles and can involve high temperature (plasma spray), high kinetic energy (cold spray) or both (HVOF spray – High-Velocity Oxi-Fuel). Resultant residual stress in such coatings, being a characteristic of the spraying process, can reveal details of the stress formation mechanism. When its dependence on the physical parameters and conditions of the spraying process is established, this knowledge can be used for the prediction and control of stress that occurs in applications. Neutron diffraction is a suitable method for obtaining stress distribution in such coatings. Residual stresses in two-phase Cu+W coatings made by water stabilized plasma spraying were studied. Two-phase coatings develop both significant microstress (inter-phase stress) and the stress dependence on phase content of the coating constituents. Through-thickness residual stress profiles have been measured by neutron diffraction with spatial resolution of 0.5 mm for a series of Cu+W coatings with varying volume fractions. Measurements were made in both phases in order to separate micro- and macro-stresses. Comprehensive sample characterization, measurements of the residual stresses, mechanical and thermal properties of the composite coatings enabled quantitative modeling and interpretation of the experimental data.
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Matějíček, Jiří, Radek Mušálek, and Pavel Chráska. "Residual Stresses and Young's Moduli of Plasma Sprayed W+Cu Composites and FGMs Determined by In Situ Curvature Method." Key Engineering Materials 606 (March 2014): 151–54. http://dx.doi.org/10.4028/www.scientific.net/kem.606.151.

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In this work, application of the in-situ curvature method on plasma sprayed composite and graded coatings is presented. First, uniform composites of different W/Cu ratio, were sprayed by water stabilized plasma. By continuous monitoring of the curvature of a flat specimen during spraying, the stress evolution throughout the entire history of coating formation was traced. By a simultaneous monitoring of curvature and temperature during post-deposition cooling, Youngs moduli of the coatings were determined. Second, a 5-layer stepwise functionally graded material (FGM) was sprayed. With the knowledge of each layers properties, the complex evolution of deposition, thermal and residual stresses in the FGM could be determined. The ability to determine the stresses and mechanical properties with a spatial resolution comparable to the thickness of one spray pass is demonstrated.
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Dragan, Mirela A., Peter Strutt, and Radenka Maric. "Crystallization and microstructure of metastable water quenched nanostructured 8 mol% yttria-stabilized zirconia using the solution precursor plasma spray method." Journal of Materials Science 49, no. 8 (January 28, 2014): 3215–24. http://dx.doi.org/10.1007/s10853-014-8026-5.

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Sivakumar, Sankaran, Subramaniam Yugeswaran, Kalimuthu Vijaya Sankar, Lakshmanan Kumaresan, Gurusamy Shanmugavelayutham, Yoed Tsur, and Jianguo Zhu. "Fabrication of nickel-yttria stabilized zirconia 3D micro-pattern by atmospheric plasma spray as a dual-functional electrocatalyst for overall water splitting applications in alkaline medium." Journal of Power Sources 473 (October 2020): 228526. http://dx.doi.org/10.1016/j.jpowsour.2020.228526.

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Góral, Marek, Tadeusz Kubaszek, Marcin Drajewicz, and Przemyslaw Borowski. "Thermal Barrier Coatings for Molybdenum Produced Using Nanopowders." Materials Science Forum 1016 (January 2021): 487–92. http://dx.doi.org/10.4028/www.scientific.net/msf.1016.487.

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The molybdenum is one of the most important refractory metals used in aerospace industry. The main disadvantage of Mo is low oxidation resistance at elevated temperature and the using of protective coatings is necessary. In present article the new types of protective coatings produced by slurry method were developed. The slurries contained Al nanopowder and Si powder as well as non-organic binder (H2CrO4 and water). After immersion and drying the samples with slurries were heat treated at 1000°C in Ar atmosphere. The thickness of obtained coatings was in range 10-20 μm. The presences of phases form Mo-Al as well Mo-Si systems was analyzed using scanning electron microscopy. The developed coatings were used as a bond coat for ceramic layer produced by plasma spray physical vapour deposition method (PS-PVD). In this process the columnar ceramic layer contains yttria stabilized zirconia (YSZ) was obtained wit thickness above 100 μm. The obtained results showed that it is possible to obtain TBC coating on molybdenum contained Al-Si bond coat and outer YSZ ceramic layer. The proposed coating can be used in aerospace applications.
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Murthy, A. K., K. Komvopoulos, and S. D. Brown. "Processing and Characterization of Multi-Layered Wear-Resistant Ceramic Coatings." Journal of Engineering Materials and Technology 112, no. 2 (April 1, 1990): 164–74. http://dx.doi.org/10.1115/1.2903303.

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A new concept of a multi-layered ceramic coating consisting of a porcelain enamel bond interlayer with thermal expansion characteristics tailored to match those of a cast iron substrate and a plasma-sprayed wear-resistant surface layer of chromium oxide, chromium carbide, or partially stabilized zirconia was investigated. Flat substrates of grit-blasted and surface-treated cast iron were slurry sprayed with a finely ground glass frit mixed with isopropyl alcohol and water. Subsequently, the specimens were dried in an oven before firing at 1023 K to produce a smooth, dense, and strongly adherent enamel coating 75 to 100 μm thick. Wear-resistant coatings of oxides and carbides with varying particle sizes and powder densities were then thermally sprayed, by means of a plasma spray gun, at controlled power ratings and gas flow rates. The produced ceramic coatings were subsequently ground to a thickness of about 120 μm. Adherence testing by the tensile pull-off technique revealed high interfacial strength between the enamel coating and the substrate resulting from enhanced chemical interdiffusion and mechanical interlocking. Unlubricated sliding wear experiments using a ball-on-flat tribotester and tungsten carbide balls as sliders demonstrated low initial and moderately high steady-state friction coefficients. Optical and scanning electron microscopy and surface profilometry of the tested ceramic-coated specimens verified that surface damage and wear rate were negligibly small. The important role of the main process parameters on the interfacial adherence and uniformity of the enamel and ceramic layers and the potentiality of the developed processes in the deposition of relatively low-friction and wear-resistant multi-layered thick ceramic coatings are discussed in the context of the obtained results.
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Dissertations / Theses on the topic "Water-stabilized plasma spray"

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Mareš, Jiří. "Modifikace charakteru rozhraní substrát-nástřik vrstev deponovaných technologiemi žárového nanášení pomocí technologie elektronového paprsku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231939.

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Tato práce je zaměřena na modifikaci charakteru rozhraní substrát-nástřik NiCrAlY povlaků nanesených pomocí technologie vodou stabilizované plazmy na substráty z oceli S235JRC+C. Přetavení žárové vrstvy elektronovým paprskem bylo zvoleno jako technologie pro modifikaci a dvě různé modifikace byly zkoumány. V práci byl proveden pokus o stanovení vlivu modifikací na adhezní vlastnosti nástřiku. Dále jsou v práci prezentovány analýzy mikrostruktury, fázového a chemického složení a mikrotvrdosti ve stavu před a po modifikaci. Během studie bylo zjištěno, že dochází ke změnám fázového složení jak během depozice, tak během modifikace elektronovým paprskem. Modifikace elektronovým paprskem způsobila roztavení oxidů původní mikrostruktury nástřiku, které následně rekrystalizovaly na povrchu modifikované vrstvy. Dalším získaným poznatkem bylo, že dochází ke snížení mikrotvrdosti po modifikaci, což bylo způsobeno odstraněním oxidů z mikrostruktury a promícháním materiálu substrátu a původního nástřiku. Adheze nástřiků v as sprayed stavu byla kvantifikována. V případě nástřiků modifikovaných elektronovým paprskem přesná kvantifikace nebyla možná, z důvodu předčasného porušení na rozhraní nástřik-adhezivní pojivo během adhezních testů.
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Conference papers on the topic "Water-stabilized plasma spray"

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Leigh, S. H., C. C. Berndt, S. Sampath, and H. Herman. "Mechanical Properties of Water Stabilized Plasma Spray-Formed Alumina-13wt% Titania." In ITSC 1996, edited by C. C. Berndt. ASM International, 1996. http://dx.doi.org/10.31399/asm.cp.itsc1996p0835.

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Abstract Mechanical properties of water stabilized plasma spray-formed Al2O3-13wt%TiO2 have been investigated by using indentation techniques and a four-point bend test. Young's modulus was determined by four point bend, nano- and Knoop indentation tests. Modulus of rupture was measured by the four-point bend test. The anisotropic behavior as well as the reduced Young's modulus and strength of thermal spray deposits are extensively investigated and can be related to the unique microstructure; i.e., the spheroidal shape of pores, cracks and splats as well as inter-lamellar boundaries. The heat treatment substantially enhanced the mechanical properties and the microstructure becomes more homogeneous and isotropic; that is, the deposits lose their unique nature and become more similar to bulk materials.
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Dobler, K., J. R. T. Branco, S. Sampath, C. C. Berndt, H. Herman, and P. J. Chráska. "Iron-Based Deposits Produced by High-Throughput Water Stabilized Plasma." In ITSC 1996, edited by C. C. Berndt. ASM International, 1996. http://dx.doi.org/10.31399/asm.cp.itsc1996p0413.

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Abstract Iron-based thermal spray deposits have been used for reclamation of machine components and wear resistance. Current thermal spray processes can be used to spray deposits a few millimeters thick at rates of 3 to 10 kg/hr. With a throughput over 100 kg/hr for metals, the Water Stabilized Plasma torch enables cost-effective processing of very thick (>1 cm) deposits at very high rates. However, limited information exists in the literature on the ability of this technology for deposition of oxygen sensitive metals. In this investigation, iron-based coatings were produced with the water stabilized plasma system. The deposits sprayed in air and with an inerting shroud were evaluated using x-ray diffraction, light microscopy, oxygen analysis and microhardness in an effort to understand the processing effects on microstructure and properties.
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Yaghtin, Maryam, Amirhossein Yaghtin, Zhaolin Tang, Tom Troczynski, and Zhaolin Tang. "Influence of Rheological Characteristics and Stability of Water-Based YSZ Suspensions on the Morphology of Plasma Sprayed Thermal Barrier Coatings." In ITSC2021, edited by F. Azarmi, X. Chen, J. Cizek, C. Cojocaru, B. Jodoin, H. Koivuluoto, Y. C. Lau, et al. ASM International, 2021. http://dx.doi.org/10.31399/asm.cp.itsc2021p0001.

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Abstract In suspension plasma spraying (SPS); the use of water based suspensions provides a cheaper; safer and more environmentally friendly alternative to organic liquids. However; due to the physical properties of water; producing a water based SPS coating with desirable microstructure has so far been elusive. In this study; the effects of pH and dispersant on the rheology and stability of YSZ water based suspensions were investigated. PEI; PBTCA and α-Terpineol were used as dispersant polymers. The stabilized suspensions were deposited by Axial III plasma spray system and the relationship between suspension parameters and the atomized droplet size and the final coating microstructure was studied. The results showed that a combination of Terpineol dispersant with pH adjustment to 2.5; could lead to a SPS coating with columnar microstructure having 17.4 vol.% porosity.
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Goubot, N., T. David, J. Baudoin, J. Dhers, M. Ducos, and H. Michaud. "Influence of Coating Removal Processes on Residual Stresses of Base Ni Sheet." In ITSC 2000, edited by Christopher C. Berndt. ASM International, 2000. http://dx.doi.org/10.31399/asm.cp.itsc2000p0385.

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Abstract Substrates protected by thermal spray coatings are usually found intact after use, making them viable candidates for recycling and reuse. The key is to remove the coating without damaging the component. This requires a process that minimizes the development of residual stresses and the associated distortion. The purpose of this work is to determine the optimal descaling technique for Ni-base sheets with a thermal barrier coating. Test specimens were produced following industry procedures. Thin sheets (<3 mm) of Ni-base superalloy were plasma sprayed with a NiCrAlY bond coat and a Y203-stabilized ZrO2 topcoat. The coating layers were then removed using different methods, including pickling, shot blasting, and water jet descaling, and the substrates were assessed based on X-ray diffraction and chord width measurements. The findings of the study show that water jetting removes all surface materials, particularly the bond coat, without damaging the underlying surface. It also produces the least amount of stress and deformation and is relatively easy to automate.
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Chraska, P., V. Brozek, B. J. Kolman, J. Ilavsky, K. Neufuss, J. Dubsky, and K. Volenik. "Porosity Control of Thermally Sprayed Ceramic Deposits." In ITSC 1998, edited by Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p1299.

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Abstract Porosity regulates the deposit's properties and therefore methods for its control are of a vital industrial importance. Thermal spraying can produce deposits in a wide range of porosities by selection of a spray process itself, by selection of spray parameters, feedstock size and chemistry, etc. Manufacturing of deposits with controlled porosity may be difficult if the selection of spray processes and materials is limited. Special methods of deposition or/and subsequent post processing may be therefore necessary. These methods are studied in the presented work. All spraying was done with the water-stabilized plasma (WSP®) system PAL 160. Thick deposits and free-standing parts were sprayed from alumina, zircon, metal Al and Ni powders and their combinations. Porosity was characterized by number of techniques such as gas permeability, water immersion, MIP, SEM and SANS. Mechanical properties were characterized by the Young's modulus. Special methods of deposition, such as spraying of mixtures of ceramics and metals were successfully used. Either sandwiched-structures with alternating layers of ceramics and metals were sprayed (for the sealing purpose) or mechanical mixtures of ceramic and metallic feedstock were sprayed. Several post-processing methods were used to change porosity volumes or other materials characteristics. To increase the porosity the metallic phases were subsequently removed by leaching or by annealing at temperatures above the melting point of metal. A number of sealing materials (organic and inorganic) were used to seal the pores by infiltration at ambient or higher pressures. The results show, that significant changes of porosity volume and, especially, of the gas permeability are possible. Another tested method was annealing/calcination of deposits, which resulted in an increase or decrease of porosity, depending on deposit's chemistry and annealing conditions. Results show that all used post processings are capable of significant changes of deposit microstructure and that they may be successfully applied in practice.
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