CuCo2Be表面热喷涂制备Cr3C2-NiCr涂层的微观结构及高温摩擦磨损行为

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。

Microstructure and the High Temperature Friction and Wear Behavior of Cr3C2-NiCr Coating on CuCo2Be Alloy by Plasma Spraying

Cr3C2-NiCr/NiAl coating on the CuCo2Be alloy was prepared by a plasma spraying technique. The high temperature dry sliding friction and wear characteristics of Cr3C2-NiCr/NiAl coating and CuCo2Be were investigated at UMT-2 tribometer using Al2O3 ceramic ball as dual material. The formation mechanism, the microstructure and the high temperature friction and wear behavior of the Cr3C2-NiCr/NiAl coating were studied by Olympus confocal laser scanning microscope, SEM, EDS, and XRD. The results show that the coating is layered and compact. Nickel-aluminum compounds are angular. The phase composition of the coating is amorphous. During the friction and wear process at 500 oC, the wear mechanisms of the coating and CuCo2Be alloy are abrasive wear and adhesive wear as well as a small amount of oxidation wear. Through observing the wear volume morphology, it would find that the wear of substrate materials with the coating is significantly less than CuCo2Be before spraying, so the high-temperature wear resistance of CuCo2Be alloy is improved by plasma spraying.