不同结构等离子喷涂热障涂层的性能研究  

Research on Properties of Plasma Sprayed Thermal Barrier Coatings with different Microstructure

作　　者：王世兴[1] 袁涛[1] 詹华[1] 汪瑞军[1] 王伟平[1] 

机构地区：[1]中国农业机械化科学研究院表面工程技术研究所,北京100083

出　　处：《表面技术》2013年第1期21-24,28,共5页Surface Technology

摘　　要：通过等离子喷涂,制备了常规层状结构、垂直裂纹结构的氧化钇部分稳定氧化锆(YSZ)和铈酸镧(LCO)热障涂层,分析了涂层的微观形貌及性能。结果表明:对于YSZ涂层,垂直裂纹结构的结合强度是层状结构的1.8倍;LCO涂层的微观结构对喷涂工艺比较敏感,适当降低喷涂功率有助于提高扁平化粒子间的结合,缓解涂层中横向裂纹的产生,促进垂直裂纹形成;与层状结构的LCO/YSZ双层涂层相比,垂直裂纹结构的LCO/YSZ双层涂层的结合强度和抗热震性能未明显提高。Yttria partially stabilized zirconia （YSZ） and Lanthanum cerium oxide （LCO） thermal barrier coatings with conventional lamellar and segmented structures were prepared by plasma spray. The result shows that bond strength of segmented YSZ coatings is higher 1.8 times than conventional lamellar coatings. The microstructures of LCO coating are more sensitive to spray process. The intersplat contact between lamellae can be enhanced by advisable reduction spray power, and the presence of branch crack is released. So the formation segmented crack is promoted. Bond strength and thermal shock resistance of LCO/ YSZ coat with segmented structures are not improved compared with conventional lamellar structure coat.

关 键 词：热障涂层 等离子喷涂 LCO YSZ 垂直裂纹 

分 类 号：TG174.453[金属学及工艺—金属表面处理]