γ-TiAl辉光等离子无氢渗碳后的组织及性能研究  

Structure and Performance of γ-TiAl Based Alloy after Hydrogen-free Double Glow Plasma Carburizing

作　　者：马士剑[1] 张平则[1] 缪强[1] 徐重[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,江苏南京210016

出　　处：《热处理》2007年第5期26-29,共4页Heat Treatment

基　　金：江苏省自然科学基金(NoBK2005128)

摘　　要：利用双层辉光等离子渗金属技术(DGPSAT)对γ-TiAl金属间化合物进行等离子表面无氢渗碳处理,用OM、EDS和XRD分析了渗碳层的显微组织、化学成分及其相组成,测试了其表面显微硬度和耐磨性。结果表明,γ-TiAl经双层辉光等离子渗碳后,其表面形成以Ti8C5,TiC,TiAl和C等相组成的合金层,有效厚度约为15μm;渗层与基体结合牢固;渗层成分由表及里呈梯度分布;摩擦磨损性能也得到了提高。Carbon elements was introduced into the γ-TiAl based alloy by using hydrogen-free glow discharge technology. The microstructure, Chemical composition and phase constituent of the carburized layer were analyzed with the aid of OM, EDS and XRD respectively. The surface microhardness and wearability of the carburized layer were also tested. The results reveal that after the hydrogen-free double-glow plasma carburizing, the alloying case consisting of Ti8C5, TiC, TiAl and C and having effective thickness of about 15 μm will be acquired on the TiAl based alloy, and that the carburized layer will be firmly bonded to the substrate and the composition of case will decrease gradually from surface to substrate. Besides, friction and wear resistances will be both improved.

关 键 词：γ-TiAl金属间化合物 双层辉光等离子无氢渗碳 摩擦 磨损 

分 类 号：TG156.81[金属学及工艺—热处理]