纳米ZrO_2等离子涂层的结构,性能和工艺特点

Structure, Property and Processing Characterization of Plasma Sprayed Nanostructured Zirconia Coating

采用大气等离子喷涂技术(APS),制备了常规氧化锆和纳米结构氧化锆两种涂层。利用扫描电镜(SEM)对涂层的显微结构进行了观察。对两种涂层的沉积效率、表面粗糙度和显微硬度作了对比研究。结果表明,粉末原料的显微结构、粒度、形态、喷涂工艺参数(喷涂功率和距离)对涂层的显微结构有较大的影响。等离子喷涂造粒纳米氧化锆粉制备的涂层沉积效率高而稳定,其显微结构与喷涂功率和距离密切相关。与常规氧化锆涂层相比,纳米结构氧化锆涂层具有较高的显微硬度和较低的表面粗糙度。

The nanostructured and conventional ZrO2 coatings were deposited by atmospheric plasma spraying technique (APS). The influence of the grain size and shape of feedstock and spraying parameters on the ZrO2 coating was examined. The deposition efficiency, roughness and Vikers microhardness of two kinds of ZrO2 coatings were measured. The obtained results reveal that the nanostructured ZrO2 coating possesses high and stable deposition efficiency, more uniform microstructure, higher Vikers microhardness and lower roughness than that of conventional ZrO2 coating.