【摘要】 利用双层辉光等离子冶金技术在Ti2Al Nb合金表面制备渗铝层,分析了渗铝层的成分、显微组织及相结构,测定了渗层的硬度分布,评价了室温干滑动磨损条件下的摩擦磨损性能。结果表明:在Ti2Al Nb合金表面形成约4μm的沉积层和6μm合金扩散层。扩散层中的硬度随渗层厚度呈梯度递减。渗铝层的磨损率为0.18×103mg/N·m,仅是基体的0.67倍,磨损机理属于轻微磨损,可见,双辉等离子渗铝在一定程度上提高基体材料的耐磨性。更多还原

【Abstract】 An aluminized layer was prepared on surface of Ti2 Al Nb alloy by double glow discharge plasma process.Microstructure,element distribution,phases structure,hardness and wear resistance of the aluminized layer were analyzed by SEM,EDS,XRD,hardness tester and dry sliding wear machine.The results show that the aluminized layer is composed of a deposited layer and a diffused layer with thickness of4 μm and 6 μm,respectively.Microhardness in the diffusion layer gradually decreases along the depth.Wear rate of the aluminized layer is0.18 × 103 mg / N·m and only 0.67 times of that of the substrate.According to the wear trace,the wear mechanism belongs to mild wear.Thus double glow plasma surface aluminized layer improves the wear resistance of Ti2 Al Nb alloy substrate to a certain extent.更多还原