钛合金表面激光熔覆高温自润滑耐磨复合涂层

发布时间：2019-05-24 06:19

【摘要】：为了提高钛合金的摩擦学性能,采用激光熔覆技术在Ti-6Al-4V合金表面制备了γ-Ni Cr Al Ti/Ti C与γ-NiCr Al Ti/Ti C/Ca F2复合涂层.采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、能谱仪(EDS)分析了涂层的物相和显微组织,在球-盘式高温摩擦磨损试验机上测试了不同温度下(室温,300℃,600℃)复合涂层的摩擦学性能.结果表明,激光熔覆的复合涂层与基体呈冶金结合,γ-Ni Cr Al Ti/Ti C/Ca F2复合涂层主要由"原位"生成的小块状,针状Ti C颗粒及Ti C树枝晶,γ-Ni Cr Al Ti固溶体基体及弥散分布的球状Ca F2颗粒组成.由于硬质增强相Ti C与增韧相γ-Ni Cr Al Ti的共同作用,γ-Ni Cr Al Ti/Ti C与γ-Ni Cr Al Ti/Ti C/Ca F2复合涂层的磨损率在试验温度下都远低于Ti-6Al-4V基体;在600℃时,γ-Ni Cr Al Ti/Ti C/Ca F2涂层的平均摩擦系数为0.21,相对于基体与γ-Ni Cr Al Ti/Ti C涂层分别降低了43%,50%,表现出良好的高温自润滑减摩性能.
[Abstract]:In order to improve the tribological properties of titanium alloy, 纬-NiCr Al Ti/Ti C and 纬-NiCr Al Ti/Ti C/Ca F _ 2 composite coatings were prepared on the surface of Ti-6Al-4V alloy by laser cladding. The phase and microstructure of the coating were analyzed by X-ray diffractometer (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS). The coating was tested at different temperatures (room temperature, 300 鈩，

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