热喷涂复合涂层不同温度下摩擦磨损特性研究

Study on friction and wear properties of thermal spraying composite coating at different temperatures

摘要:

摘 要: 文中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陶瓷球为对偶材料运用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，并选用三位轮廓仪、扫描电镜、能谱仪、XRD等分析测试手段，详细研究了CuCo2Be合金及喷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。研究结果表明：等离子喷涂获得的复合涂层致密，涂层为层状结构，物相组成呈现非晶态。通过摩擦磨损试验研究，结果表明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；在常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。

Abstract:

Abstract: Cr3C2-NiCr/NiAl coating was prepared by plasma spraying technique on the CuCo2Be alloy. The high temperature dry sliding friction and wear characteristics of Cr3C2-NiCr/NiAl coating and CuCo2Be was investigated in detail at UMT-2 tribometer by using Al2O3 ceramic ball as dual material, and it explored the temperature friction and wear behavior of the Cr3C2-NiCr/NiAl coating at different temperatures by three dimensional profile instrument，SEM， EDS, and XRD et.The results showed that the coating had obvious layered and nickel-aluminum compounds were angular,and the phase formation of the coating appeared amorphous. The study results about the friction and wear showed：500℃ through observing the wear volume morphology，it would find the wear of coating was significantly less than CuCo2Be before sprayed, so study conclusions showed Cr3C2-NiCr/NiAl coating have better high temperature wear resistance；At room temperature,the friction and wear mechanism of the composite coating was mainly abrasive wear, and wear less, and with the increase of temperature,the wear mechanism of the coating was mainly oxidation wear and adhesive wear.