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利用双层辉光等离子表面渗金属技术(DGPSAT)在γ-Ti Al合金表面进行等离子渗Cr-W处理,采用扫描电镜、硬度分析、X-射线及磨损试验,研究了Cr-W共渗合金层对γ-Ti Al合金组织结构、成分、硬度及磨损性能的影响规律。结果表明,γ-Ti Al与共渗合金层表面结构均匀,结合处连接紧密,无孔洞、裂纹等缺陷;共渗合金层硬度比基体高近2倍,且至少可承受65 N垂直载荷;在室温和500℃下含有Cr-W共渗合金层的γ-Ti Al合金的摩擦系数、磨损率和磨损失重均小于基体。
The surface of γ-TiAl alloy was plasma-infiltrated with Cr-W by double-glow plasma surface alloying (DGPSAT) technique. The effects of Cr-W co-diffusion on the surface of γ-TiAl alloy were studied by scanning electron microscopy, hardness analysis, X-ray and wear tests. Layer on γ-Ti Al alloy structure, composition, hardness and wear resistance of the law. The results show that the surface structure of γ-TiAl and the co-permeable alloy layer is uniform and the joints are closely connected with no defects such as voids and cracks. The hardness of the co-permeable alloy layer is nearly 2 times higher than that of the substrate and can withstand at least 65 N vertical load. And the friction coefficient of γ-Ti Al alloy containing Cr-W alloying layer at 500 ℃, the wear rate and the wear loss are both less than the matrix.