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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructure, High-Temperature Wear Resistance, and Corrosion Resistance of Laser Cladded Co-Based Coating
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Microstructure, High-Temperature Wear Resistance, and Corrosion Resistance of Laser Cladded Co-Based Coating

机译：激光熔覆Co基涂层的微观结构，高温耐磨性和耐腐蚀性

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摘要

Co-based coating has been fabricated on Ti-6Al-4V (TC4) titanium alloy by laser cladding. The phase composition and microstructure of the coating were analyzed using metallurgical microscope (MM), scanning electron microscope (SEM), x-ray diffraction (XRD), energy-dispersive spectroscopy (EDS) and transmission electron microscopy (TEM), respectively. The microhardness, high temperature wear resistance and corrosion resistance of the coating were investigated by performance tests. The results show that the coating was mainly composed of CoTi, CoTi2 and Co0.5Cr1.5Ti crystalline phases and an amorphous phase. The microhardness of the coating was twice that of the titanium alloy substrate. The value of friction and wear coefficient of the coating was lower and more stable, and the wear mass loss decreased by 52% as compared with the substrate in the high-temperature friction and wear test. The oxidative wear mechanism in the condition of high temperature friction and wear was studied. Moreover, the coating exhibited better corrosion resistance than the substrate in both NaCl and H2SO4 electrolyte solutions.
机译：采用激光熔覆技术在Ti-6Al-4V（TC4）钛合金表面制备了钴基涂层。分别用金相显微镜（MM）、扫描电镜（SEM）、x射线衍射（XRD）、能谱仪（EDS）和透射电镜（TEM）分析了涂层的相组成和微观结构。通过性能测试，研究了涂层的显微硬度、高温耐磨性和耐腐蚀性。结果表明，涂层主要由CoTi、CoTi2和Co0组成。5Cr1。5Ti晶相和非晶相。涂层的显微硬度是钛合金基体的两倍。在高温摩擦磨损试验中，涂层的摩擦磨损系数较低且更稳定，磨损质量损失比基体降低了52%。研究了高温摩擦磨损条件下的氧化磨损机理。此外，该涂层在NaCl和H2SO4电解质溶液中均表现出比基体更好的耐腐蚀性。

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