摘要
采用热浸镀法在Ti6Al4V合金表面制备出TiAl3金属间化合物涂层,并在不同温度下对浸镀后的试样进行热扩散处理。通过XRD、SEM等分析手段对涂层结构和成分进行测试分析,探讨涂层形成机理。结果表明:Ti6Al4V合金经750℃5 min热浸铝后,在其表面形成了由纯铝和TiAl3组成的涂层,TiAl3合金层厚约1.5μm;经550℃退火5 h后,TiAl3含量增多而纯铝层含量则相应减少,纯铝层几近消失,合金层厚度约为40μm,涂层致密;经930℃退火5 h后,表面的涂层转化为单相的TiAl3,产物纯净,但涂层中出现了较多的孔洞,自涂层表面到钛合金基体,孔洞浓度呈梯度变化。
A layer of TiA13 intermetallic compound coating was prepared on Ti6A14V alloy by hot -dip a- luminizing, and the obtained sample was treated by thermal diffusion. The coating was analyzed by XRD and SEM to probe into its structure and compositions. The formation mechanism of the coating was also discussed. The results show that after hot-dip aluminizing at 750 ℃ for 5 rain, a coating consisting of pure A1 and TiA13 alloy（ with thickness of 1.5 μm） is formed on the surface of Ti6A14V alloy ; after an- nealing at 550℃ for 5 h, the thickness of dense TiA13 increases to 40 μm and A1 layer almost disap- pears; after annealing at 930 ℃ for 5 h, all the coating is composed of pure TiA13, but lots of holes ap- pear in the coating at the same time. From the coating surface to the alloy matrix, the amounts of holes are in gadient variation.
出处
《钢铁钒钛》
CAS
北大核心
2013年第1期31-34,共4页
Iron Steel Vanadium Titanium
基金
国家自然科学基金项目(51071078)
江苏省高校摩擦学重点实验室开放项目(kjsmcx1004)
