摘要
用Ｘ 射线衍射、扫描电镜和显微硬度研究了等离子喷涂Ａｌ２Ｏ３ 陶瓷涂层激光重熔处理后陶瓷熔化层的组织结构及硬度变化特征。激光重熔区亚稳相γ－ Ａｌ２Ｏ３ 转变成为稳定相α－ Ａｌ２Ｏ３；陶瓷熔化层致密、无孔隙，但存在裂纹；熔化层硬度有较大提高，且随激光能量密度的增大而增大，而与涂层设计几乎无关。此外，激光重熔能较大地提高Ａｌ２Ｏ３ 陶瓷涂层的耐磨性。
The microstructure and microhardness of the laser remelting layer in the plasma sprayed Al 2O 3 ceramic coatings have been investigated using x-ray diffraction,scanning electronic microscope and microhardness measurements.After laser remelting,the metastable γ-Al 2O 3 in the remlted area has transferred into stable phase α-Al 2O 3.The remelted layer becomes very dense and porous-free,but some cracks exist.The hardness of the layer has been largely developed and increases with the output energy density of laser.It,however,is almost independent of the coating design.Moreover,the wear resistance of the ceramic coating has been also considerably improved after laser remelting.
出处
《应用激光》
CSCD
北大核心
1999年第6期341-344,共4页
Applied Laser
基金
国家教委博士点基金!(项目号D1- 102-072)
广东省自然科学基金!(项目号970253)
关键词
等离子喷涂
AL2O3陶瓷
涂层
激光重熔
plasma spraying, Al_2O_3 ceramic coating, laser remelting, microhardness, wear resistance
