Thermophysical properties of lanthanum zirconate coating prepared by plasma spraying and the influence of post-annealing |
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Authors: | Hongfei Chen Yanfeng Gao Shunyan Tao Yun Liu Hongjie Luo |
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Affiliation: | aShanghai Institute of Ceramics (SIC), Chinese Academy of Sciences (CAS), 1295 Dingxi, Changning, Shanghai 200050, China;bGraduate University of Chinese Academy of Sciences, 19 Yuquanlu, Beijing 100049, China |
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Abstract: | Nano-scaled lanthanum zirconate powder prepared by co-precipitation–calcination method was plasma-sprayed into a thick coating on an alloy substrate. We investigated the thermophysical properties of the free-standing coating, including thermal conductivity and thermal expansion coefficients (TECs). Minimum value of the thermal conductivity (at 900 °C) of the coating was about 0.73 W m−1 K−1, and the average TEC in the measurement range was about 9.45 × 10−6 K−1. Although the TEC value was similar to that of the bulk material, the change tendency versus temperature was different. After annealing at 1300 or 1400 °C for 50 h, we found that the heat insulation performance of the coating decreased with the heat treatment temperature, while the hardness and fracture toughness increased. A peak of sudden decrease in TEC value can be observed in the curve, and with increasing temperature, the peak shifted to high-temperature direction. |
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Keywords: | Lanthanum zirconate Plasma spraying Thermophysical property Mechanical property Heat treatment |
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