添加固体润滑剂h-BN的钛合金激光熔覆γ-Ni基高温耐磨复合涂层研究

相占凤; 刘秀波; 罗健; 任佳; 石皋莲; 吴少华

应用激光, 2014, 34 (5): 383, 网络出版: 2014-12-08

添加固体润滑剂h-BN的钛合金激光熔覆γ-Ni基高温耐磨复合涂层研究

Study of γ-Ni based High Temperature Anti-Wear Composite Coatings with Addition of h-BN Solid Lubricant on Titanium Alloy by Laser Cladding

论文大纲

相占凤 ^1,*刘秀波 ¹罗健 ¹任佳 ¹石皋莲 ²吴少华 ²

作者单位

¹ 苏州大学机电工程学院, 江苏苏州 215006

² 苏州工业职业技术学院, 江苏苏州 215104

激光熔覆固体润滑高温耐磨复合涂层显微组织 laser cladding solid lubrication high temperature anti-wear composite coating microstructure h-BN property

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合金基体表面制备了以“原位”生成TiB2、CrB、TiC等为增强相、γ-Ni基固溶体为增韧相及h-BN为润滑相的γ-Ni基高温自润滑复合涂层。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:激光熔覆制备的复合涂层与基体呈冶金结合, 该复合涂层的摩擦系数和磨损率都远低于Ti-6Al-4V基体;在高温600 ℃时, 复合涂层的磨损率和平均摩擦系数为5.13×10-5 mm3/Nm和0.184, 相对于钛合金基体分别降低了81.8%、38%, 表现出良好的高温自润滑耐磨性能。

Abstract

To improve the tribological property of titanium alloy, γ-Ni based high-temperature self-lubrication anti-resistance composite coatings composed of “in-situ” synthesized TiB2, CrB, TiC reinforcement, tough γ-Ni based solid solution and h-BN lubricating phase were fabricated on Ti-6Al-4V alloy by laser cladding technology. The constituents and microstructure of the fabricated coatings were examined by X-ray diffraction(XRD), scanning electron microscope (SEM), energy dispersive spectroscopy(EDS)techniques, and the tribological properties were evaluated by a ball-on-disc tribometer under dry sliding wear test conditions at room-temperature, 300 ℃and 600 ℃, respectively. The results show that the bonding of the coatings to the substrates is completely metallurgical. The wear rates of the fabricated coatings were greatly decreased due to the effects of the dominating anti-wear capabilities of hard borides, carbides and the ductile γ-Ni based solid solution. Moreover, the wear rates and average friction coefficient of γ-Ni based composite coating were 5.13×10-5 mm3/Nm and 0.184 at 600 ℃, which were reduced by 81.8% and 38% compared to the substrate, respectively. It indicates that the composite coating has good friction-reducing and anti-wear capabilities at high temperature.

参考文献

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相占凤, 刘秀波, 罗健, 任佳, 石皋莲, 吴少华. 添加固体润滑剂h-BN的钛合金激光熔覆γ-Ni基高温耐磨复合涂层研究[J]. 应用激光, 2014, 34(5): 383. Xiang Zhanfeng, Liu Xiubo, Luo Jian, Ren Jia, Shi Gaolian, Wu Shaohua. Study of γ-Ni based High Temperature Anti-Wear Composite Coatings with Addition of h-BN Solid Lubricant on Titanium Alloy by Laser Cladding[J]. APPLIED LASER, 2014, 34(5): 383.

添加固体润滑剂h-BN的钛合金激光熔覆γ-Ni基高温耐磨复合涂层研究

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