用大功率ＣＯ_２激光器对在１Ｃｒ１８Ｎｉ９Ｔｉ基体喷涂的Ａｌ_２Ｏ_３－１３ｗｔ－％ＴｉＯ_２陶瓷涂层进行重熔，获得了均匀的陶瓷重熔层。采用透射电镜通过选区电子衍射、衍衬像及Ｘ射线能谱分析（ＥＤＡＸ）等手段对激光重熔陶瓷层的微观组织和相结构进行了观察研究。结果表明，激光重熔陶瓷层中ＴｉＯ_２与部分Ａｌ_２Ｏ_３生成Ａｌ_２ＴｉＯ_５，其余的α－Ａｌ_２Ｏ_３晶粒有少量的基体元素渗入，并均匀分布着许多细小的超结构相，在Ａｌ_２ＴｉＯ_５中较多的Ｔｉ元素被基体元素取代。α－Ａｌ_２Ｏ_３与Ａｌ_２ＴｉＯ_５相的分布随着与表面的远近呈有规律的变化，在靠近表面和靠近基体处Ａｌ_２ＴｉＯ_５呈条状和块状分布在α－Ａｌ_２Ｏ_３的晶界处，且靠近基体的Ａｌ_２ＴｉＯ_５量越来越多。
Microstructure,morphology and composition of the phases in 2 kW laser remelted Al_2O_3-13wt-%TiO_2 ceramic coatings on ICr18Ni9Ti substrate were examined by using electron diffraction, diffraction contrast image and EDAX. Results showed that TiO_2 and a part of Al_2O_3 formed Al_2TiO_5 and a superlattice phase appeared in the ceramic layer;a little alloy element of substrate permeated into α-Al_2O_3 and replaced only a part of Ti in Al_2TiO_5.The distribution and morphology of α-Al_2O_3 and Al_2TiO_5 were related with the distance from surface.The shape of Al_2TiO_5 was strip near surface and block near substrate,and the farther from surface,and the more Al_2TiO_5 in the coatings.
参考文献
| [1] | |
| [2] | 樱井良文,小泉光慧编,陈俊彦,王余君译,新型陶瓷材料及应用,北京:中国建筑工业出版社,1983:202戴安邦,沈孟长．元素周期表．上海:上海科学技术出版社,1979:13MosinB,LynchRW,ActaCrystallogr,1972 |
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