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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高温摩擦磨损试验,并选用共聚焦激光扫描显微镜、扫描电镜、能谱仪、XRD等分析测试手段,详细研究了CuCo2Be合金表面等离子喷涂涂层物相组成、微观形貌及涂层和基体的高温滑动摩擦磨损行为,结果表明:CuCo2Be合金表面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。通过高温摩擦磨损研究,结果表明:500℃摩擦磨损磨损过程中,涂层及CuCo2Be合金基体的磨损机制为:疲劳磨损和粘着磨损及少量氧化磨损的共同作用,从磨损的体积形貌来看涂层磨损量明显小于未喷涂之前的基体材料,等离子喷涂工艺制备的Cr3C2-NiCr/NiAl涂层质量优异,提高了材料的高温耐磨性。
The Cr3C2-NiCr / NiAl composite coating was prepared on the surface of CuCo2Be alloy by plasma spraying. Using Al2O3 ceramic ball as the even material, the friction and wear test of the substrate and the composite coating were carried out by UMT-2 friction and wear tester. The methods of confocal laser scanning microscopy, scanning electron microscopy, energy dispersive spectroscopy and XRD were adopted. The phase composition, microstructure, and high temperature sliding friction and wear behavior of plasma sprayed coatings on CuCo2Be alloy surface were studied. The results show that the composite coatings obtained by plasma spraying on the surface of CuCo2Be alloy are dense and the coating is of layered structure. The phase composition appears amorphous. Through the study of friction and wear at high temperature, the results show that the wear mechanism of the coating and the CuCo2Be alloy substrate during the friction and wear process at 500 ℃ are as follows: the combined action of fatigue wear and adhesive wear and a small amount of oxidation wear, as seen from the worn volume morphology The wear amount of the layer is obviously smaller than that of the non-sprayed substrate. The Cr3C2-NiCr / NiAl coating prepared by the plasma spraying process has excellent quality and improves the wear resistance of the material at high temperature.