首页|Optimization of mechanical properties and thermal shock resistance of LaPO4/8YSZ thick composite coatings via plasma spraying
Optimization of mechanical properties and thermal shock resistance of LaPO4/8YSZ thick composite coatings via plasma spraying
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NSTL
Elsevier
? 2022 Elsevier B.V.The aim of the current study was to optimize the mechanical properties and thermal shock resistance of plasma-sprayed LaPO4/8YSZ coatings with thickness of 1 mm based on a modified Vickers indentation method. As the LaPO4 content increased from 1 wt% to 30 wt%, the increasing porosity of the composite coatings led to the decrease of bonding strength of the coatings from 8.43 ± 0.29 MPa to 6.08 ± 0.12 MPa, while residual stress and fracture toughness of the composite coatings exhibited an increased tendency. Although the bonding strength of LaPO4/8YSZ coatings was lower than that of 8YSZ coating (11.49 ± 0.19 MPa), the minimum residual stress of -(51.83 ± 3.38) MPa for the coating with LaPO4 content of 1 wt% was obtained, further resulting in the maximum thermal cycling lifetime of 5340 ± 49 cycles during thermal shock test at 900 °C. Correspondingly, thermal shock resistance was strongly dependent on the microstructure and mechanical properties of LaPO4/8YSZ coatings with the addition of nano-LaPO4 particles.
Science and Technology on Advanced Ceramic Fibers & Composites Laboratory College of Aerospace Science and Engineering National University of Defense Technology
Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation School of Chemistry and Chemical Engineering Changsha University of Science & Technology
School of Materials Science and Engineering Changsha University of Science and Technology
NSTL
Elsevier
