Mechanical Properties of Yttria- and Ceria-Stabilized Zirconia Coatings Obtained by Suspension Plasma Spraying
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eszek Łatka, Andrea Cattini, Didier Chicot, Lech Pawłowski, Stefan Kozerski, Fabrice Petit, and Alain Denoirjean (Submitted June 20, 2012; in revised form November 27, 2012)
Plasma generated by the SG-100 torch was applied to spray suspension formulated with the use of ZrO2 + 8 wt.% Y2O3 (8YSZ) and ZrO2 + 24 wt.% CeO2 + 2.5 wt.% Y2O3 (24CeYSZ) as solid phases. The suspensions were formulated with the use of 20 wt.% solid phase, 40 wt.% water, and 40 wt.% ethanol. The plasma spray parameters were optimized by keeping constant: (a) the electric power of 40 kW and (b) the working gas compositions of 45 slpm for Ar and 5 slpm for H2. On the other hand, the spray distance was varied from 40 to 60 mm and the torch linear speed was varied from 300 to 500 mm/s. The coatings were sprayed onto stainless steel substrates, and their thicknesses were in the range from 70 to 110 lm. The coating microstructures were analyzed with a scanning electron microscope. Mechanical properties were tested with the different methods including the indentation and scratch tests. The indentation test, carried out with various loads ranging from 100 to 10,000 mN, enabled to determine elastic modulus and Martens microhardness. YoungÕs modulus of the coatings was in the range of 71107 GPa for 8YSZ and 68-130 GPa for 24CeYSZ coatings. The scratch test enabled the authors to find the scratch macrohardness.
Keywords
CoNiCrAlY, isothermal oxidation, particle size distribution, vacuum plasma spray
This article is an invited paper selected from presentations at the 2012 International Thermal Spray Conference and has been expanded from the original presentation. It is simultaneously published in Thermal Spray 2012: Proceedings of the International Thermal Spray Conference, Air, Land, Water, and the Human Body: Thermal Spray Science and Applications, Houston, TX, USA, May 21-24, 2012, Basil R. Marple, Arvind Agarwal, Laura Filofteia-Toma, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Andre´ McDonald, Ed., ASM International, Materials Park, OH, 2012. Leszek Łatka, SPCTS UMR CNRS 7315, University of Limoges, 87068 Limoges, France; and Faculty of Mechanics, Wrocław University of Technology, 50-371 Wrocław, Poland; Andrea Cattini, SPCTS UMR CNR 7315, University of Limoges, 87068 Limoges, France; and Departmentment of Materials and Environmental Engineering, University of Modena and Reggio Emilia, 41125 Modena, Italy; Didier Chicot, LML, University Lile Nord de France, 59650 Villeneuve dAscq, France; Lech Pawłowski, and Alain Denoirjean, SPCTS UMR CNRS 7315, University of Limoges, 87068 Limoges, France; Stefan Kozerski, Faculty of Mechanics, Wrocław University of Technology, 50-371 Wrocław, Poland; and Fabrice Petit, Belgian Ceramic Research Center, 7000 Mons, Belgium. Contact e-mail: lech.pawlowski@ unilim.fr.
Journal of Thermal Spray Technology
1. Introduction Suspension plasma spraying is a new coating-deposition technique that uses a feedstock in a form of suspension (slurry) including, in most cases, finely grained nanometric, s
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