【摘要】 选用等离子喷涂技术在CuCo₂Be合金表面制备了Cr₃C₂-NiCr/NiAl复合涂层。以Al₂O₃陶瓷球为对偶材料使用UMT-2摩擦磨损试验机对基体和复合涂层进行不同温度下的摩擦磨损试验,并选用三维轮廓仪、扫描电镜、能谱仪、XRD等分析测试手段详细研究了CuCo₂Be合金及涂层在不同温度下滑动摩擦磨损后的微观形貌以及摩擦磨损特性。结果表明:等离子喷涂获得的复合涂层致密,涂层为层状结构,物相组成呈非晶态。500℃时涂层磨损体积远远小于铜合金磨损体积,具有优良的抗摩擦耐磨损性能;在室温时涂层磨损机制以磨粒磨损为主,磨损较小;随着温度的升高,涂层磨损机制以氧化磨损和粘着磨损为主。更多还原

【Abstract】 Cr₃C₂-NiCr/NiAl composite coating was prepared by plasma spraying technique on the CuCo₂ Be alloy. The high temperature dry sliding friction and wear tests of the Cr₃C₂-NiCr/NiAl coating and CuCo₂ Be alloy was performed by UMT-2 tribometer with Al₂O₃ ceramic ball as dual material. The friction and wear behavior of the Cr₃C₂-NiCr/NiAl coating at different temperatures was investigated by three dimensional profile instrument, SEM, EDS, and XRD. The results show that the prepared Cr₃C₂-NiCr/NiAl composite coating is dense and layered, and the phase of the coating is amorphous. At 500 ℃, the wear volume of the coating is significantly less than that of CuCo₂ Be substrate; thus the Cr₃C₂-NiCr/NiAl coating has better high temperature wear resistance. At room temperature, the friction and wear mechanism of the composite coating is mainly abrasive wear, and wear is slight; with the increase of temperature, oxidation wear and adhesive wear are dominant in the coating.更多还原