等离子喷涂Al_2O_3+13%TiO_2陶瓷涂层的组织结构及其耐磨性

The Structure and Wear Resistance of Plasma Sprayed Al_2O_3 + 13 %TiO_2 Ceramic Coating

本文用Ｘ射线衍射、扫描电镜等研究了等离子喷涂Ａｌ２Ｏ３＋１３％ＴｉＯ２（质量分数）陶瓷涂层的相结构、相组成及其组织特征。陶瓷涂层孔隙率低，致密程度较高，以正稳相ｒ－Ａｌ２Ｏ３为主要相，同时存在ａ─Ａｌ２Ｏ３和金红石 ＴｉＯ２。富Ａｌ２Ｏ３区与富ＴｉＯ２区呈明显相互交迭的层状结构，且存在相互成分扩散。另外，涂层设计对硬度有一定影响， ＴｉＯ２的引入提高了涂层的耐磨性。

The phase structure and phase composition in the plasma sprayed Al2O3+ 13 %TiO2 ceramic coatings have been investigated using X-ray diffraction and scanning electronic microscope The ceramic Coating displays rather dense, that is. it possesses a low porosity. Besides the main phase, metastable r- Al2O3, there also exist stable phase a- Al2O3 and TiO2 in the coating. The Al2O3 rich lamellae and TiO2 -rich lamellae obviously show a laminated structure and composition diffusion exists between them. Furthermore, it is found that the coating design has an effect on the micro- hardness in some degree and the additive TiO2 can largely develops the wear resistance of the ceramic coating.