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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。
Double-hull plasma surface metallurgy was used to achieve Cr-Si co-permeation on γ-TiAl-based alloy. The morphology, chemical composition and phase structure of the Cr-Si co-diffusion layer were analyzed by optical microscope (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD) Hardness. The ball-disc friction and wear test was carried out to study the wear resistance of γ-TiAl-based alloy by Cr-Si infiltrating treatment. The results show that there are three sublayers on the surface of the alloy after co-infiltration treatment. The content of elements in the co-infiltration layer continuously transits, and the infiltration layer is metallurgically bonded with the matrix. The surface hardness of the alloy increases to HV0.11 200-1 250; Transition layer strength and toughness, effectively improve the wear resistance of the alloy.