Thermophysical properties of solution precursor plasma-sprayed La2Ce2O7 thermal barrier coatings

作     者：Bei-Bei Feng Yi Wang Qiang Jia Wei Huang Hong-Li Suo Wen Ma 

作者机构：School of Materials Science and Engineering Beijing University of Technology Beijing 100022 China The Key Laboratory of Advanced Functional Materials Ministry of Education of China Beijing University of Technology Beijing 100022 China School of Materials Science and Engineering Inner Mongolia University of Technology Huhhot 010051. China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2019年第38卷第7期

页      面：689-694页

核心收录：

学科分类：0806[工学-冶金工程] 08[工学] 

基　　金：financially supported by the National Natural Science Foundation of China (Nos. 51571002 and 51401003) Beijing Municipal Natural Science Foundation(Nos. 2172008 and KZ201310005003) 

主　　题：La2Ce2O7 Solution precursor plasma spraying Thermal conductivity Segmentation cracks 

摘      要：La2Ce2O7 (LCO) is a promising candidate for thermal barrier coatings (TBCs) due to that it provides better thermal insulation than yttria-stabilized zirconia (YSZ) does. In this work, a TBC LCO was produced by solution precursor plasma spraying (SPPS). After the solution precursors were prepared and the spraying parameters were optimized, the thermophysical properties and thermal shock performance of the coatings were tested. It was found that the SPPS coating with segmentation crack density of 6 mm^-1 had the porosities of about 33.5% at spray distances of 35 mm. The thermal conductivity of the SPPS coatings is 0.50-0.75 W·m^-1·K^-1, much lower than that of the atmospheric plasma spraying (APS) coatings (0.85-1.25 W·m^-1·K^-1). The thermal shock performance of the SPPS coatings reached 60 cycles, much better than the APS coatings. This improvement is due to the segmentation cracks in the coatings, which can improve strain tolerance and effectively relieve internal stress. This study provides reference significance for further research on thermal barrier coatings.