Thermal and mechanical properties of ZrO2-CeO2 plasma-sprayed coatings |
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Authors: | S Sodeoka M Suzuki K Ueno H Sakuramoto T Shibata M Ando |
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Affiliation: | (1) Osaka National Research Institute, Agency of Industrial Science and Technology, Midorigaoka 1-8-31, 563 Ikeda, Osaka, Japan;(2) Osaka Electronics and Communication University, Hatsucho 18-8, 572 Neyagawa, Osaka, Japan |
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Abstract: | The thermal and mechanical properties of ZrC2-CeO
2plasma-sprayed coatings were evaluated to examine their potential as a thermal barrier coating. ZrO2-CeO2 solid-solution powders containing up to 70 mol % CeO2 are successfully plasma sprayed, but cerium content decreases during spraying due to the vaporization of cerium oxide. Hardness
is greatest at 30 mol% CeO2. With increased CeO2 content, the thermal conductivity decreases to 0.5 W/m K and the thermal expansion coefficient increases to 12.5 x 10-6 /K. Increased torch input power causes both the relative density and the hardness to increase monotonically, while the thermal
conductivity and the thermal expansion coefficient are not significantly affected. When heated above 1300 K, the coating shrinks
considerably due to sintering and its thermal conductivity increases abruptly. |
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Keywords: | ceria stabilization prossesing parameters thermal barrier coating |
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