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| 钛合金表面激光熔覆高温自润滑耐磨复合涂层 |
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孟祥军1,2, 刘秀波1,3, 刘海青1, 陈瑶1
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1.苏州大学 机电工程学院, 苏州 215006;2.江苏城乡建设职业学院, 常州 213147;3.中国科学院 兰州化学物理研究所 固体润滑国家重点实验室, 兰州 730000
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| 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-NiCrAlTi/TiC与γ-NiCrAlTi/TiC/CaF2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-NiCrAlTi/TiC/CaF2复合涂层主要由"原位"生成的小块状,针状TiC颗粒及TiC树枝晶,γ-NiCrAlTi固溶体基体及弥散分布的球状CaF2颗粒组成. 由于硬质增强相 TiC与增韧相γ-NiCrAlTi的共同作用,γ-NiCrAlTi/TiC与γ-NiCrAlTi/TiC/CaF2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-NiCrAlTi/TiC/CaF2涂层的平均摩擦系数为0.21,相对于基体与γ-NiCrAlTi/TiC涂层分别降低了43%,50%,表现出良好的高温自润滑减摩性能. |
| 关键词: 激光熔覆 固体润滑 高温耐磨复合涂层 显微组织 性能 |
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| 基金项目:江苏省自然科学基金资助(BK20141194,BK20131155);江苏省材料摩擦学重点实验室开放基金(Kjsmcx201301) |
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| High temperature self-lubrication anti-wear composite coatings on titanium alloy by laser cladding |
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MENG Xiangjun1,2, LIU Xiubo1,3, LIU Haiqing1, CHEN Yao1
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1.School of Mechanical and Electric Engineering, Soochow University, Suzhou 215006, China;2.Jiangsu Vocational College of Construction, Changzhou 213147, China;3.State Key Laboratory Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
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| Abstract: |
| To improve the tribological property of titanium alloy, γ-NiCrAlTi/TiC composite coatings and γ-NiCrAlTi/TiC/CaF2 high-temperature self-lubrication composite coatings 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 using a ball-on-disc tribometer under dry sliding wear test conditions at room-temperature, 300 ℃, 600 ℃, respectively. The results show that the bonding of the coatings to the substrates is completely metallurgical. The microstructure of the γ-NiCrAlTi/TiC/CaF2 cladding coating is consisted of the “in-situ” synthesized small clump and needle shaped TiC particles,TiC dendrite, γ-NiCrAlTi solid solution and spherical CaF2 particles. The wear rate of the fabricated coatings was greatly decreased mainly due to the combined effect of the wear-resistant TiC carbides and the ductile γ-NiCrAlTi matrix. Moreover, the average friction coefficient of γ-NiCrAlTi/TiC/CaF2 coating was 0.21 at 600 ℃, which was reduced by 43 % and 50 % compared to the substrate and γ-NiCrAlTi/TiC coating, respectively. It indicates that γ-NiCrAlTi/TiC/CaF2 coating has good friction-reducing and anti-wear properties at high temperature. |
| Key words: laser cladding solid lubrication high temperature anti-wear composite coating microstructure property |
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