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 .