双辉等离子Cr-Si共渗改善γ-TiAl基合金耐磨性能的研究  

Cr-Si Co-impregnation by Double Glow Plasma Surface Alloying Technique and Wear Resistance Improvement of γ-TiAl-based Alloy

作　　者：李亚非 张平则[1] 李闯[1] 于进文[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,江苏南京211100

出　　处：《稀有金属与硬质合金》2011年第3期38-43,共6页Rare Metals and Cemented Carbides

基　　金：江苏省自然科学基金(BK2005128)

摘　　要：采用双辉等离子表面冶金技术在γ-TiAl基合金表面实现了Cr-Si共渗。利用光学显微镜(OM)、扫描电子显微镜(SEM)、X射线衍射仪(XRD)分析了Cr-Si共渗层的形貌、化学成分及相结构;采用显微维氏硬度计测试了渗层硬度;通过无润滑条件下的球-盘式摩擦磨损实验研究了Cr-Si共渗处理对γ-TiAl基合金表面耐磨性能的改善状况。结果表明:共渗处理后合金表面出现了三个亚层;共渗层内元素含量连续过渡,渗层与基体实现冶金结合,合金表面硬度提高至HV0.11 200～1 250;与基体相连的过渡层强韧性兼备,有效改善了合金的耐磨性能。Cr-Si co-impregnation on surface of γ-TiAl-based alloy was carried out by double glow plasma surface alloying technique. Morphology, composition and phase structure were investigated by OM, SEM and XRD. The hardness of the impregnation layer was determined by micro Vickers hardness tester. The influences of Cr-Si co-impregnation on wear resistance of γ-TiAl-based alloy surface were studied through ball-disc friction and wear experiments without lubrication. The results show that there are three sublayers on the alloy impregnation surface. The element content changes continuously in the impregnation layer. The impregnation layer is combined with the substrate by metallurgical bonding. Hardness of the alloy surface increases to HV0.11 200~ l 250. The transition layer connected to the substrate is of better strength and toughness ,which can effectively improve the wear resistance of the alloy.

关 键 词：Γ-TIAL基合金 等离子渗金属 Cr—Si共渗 耐磨性 

分 类 号：TG178[金属学及工艺—金属表面处理]