摘要：针对不同类型的Y2O3部分稳定ZrO2(YSZ)喷涂粉末,分析喷涂粉末对等离子喷涂氧化锆热障涂层结构和性能的影响。结果表明:熔融破碎型粉末涂层的孔隙率较小,热导率较大;空心球形粉末涂层孔隙率适中,层间孔隙率较大;扁平粒子界面数量较多,涂层的热导率最小,团聚烧结型粉末涂层虽然具有最大的孔隙率,但是层间孔隙率和扁平粒子界面数量小于空心球形粉末涂层的,其热导率介于两者之间;高纯和低密度YSZ喷涂粉末可提升热障涂层的抗烧结能力,从减小热障涂层热导率及延长高温使用寿命的角度考虑,应发展高纯、低密度的空心球形粉末技术。
关键词：等离子喷涂；热障涂层；Y2O3部分稳定ZrO2
Abstract： The effect of yttria-stabilized zirconia (YSZ) powders on structures and properties of plasma-sprayed thermal barrier coatings was analyzed for different types of powders. The results indicate that the porosity of fused crushed powders coatings is small, and the thermal conductivity is large. The porosity of hollow spheres powders coatings is medium. The porosity between layers is high, the interface amount of flat particles is large, and the thermal conductivity is the smallest. The porosity of agglomerate sintered powders coatings is the largest, but for the porosity between layers and interface amount of flat particles being lower than those of hollow spheres powders coatings, the thermal conductivity is between them. YSZ powders with high purity and low density can improve the sintering resistance performance of thermal barrier coatings. From the perspective of decreasing thermal conductivity of thermal barrier coatings and extending life length in high temperature, the technology of high purity and low density hollow spheres powders should be developed.
Keywords: plasma spray; thermal barrier coatings; yttria-stabilized zirconia powder
