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为了降低TiC/镍基合金复合涂层的摩擦因数并增强其耐磨性能,运用等离子喷涂技术在45#钢表面制备石墨/TiC/镍基合金(GTN)复合涂层。研究石墨含量对GTN涂层组织和摩擦学性能的影响。结果表明,石墨的加入有效地降低了涂层的摩擦因数,提高了其耐磨性。6.56GTN涂层和12.71GTN涂层分别在低载荷与高载荷摩擦条件下呈现出优异的减摩耐磨性能。在低载荷条件下,GTN涂层的磨损机理主要表现为多次塑变磨损,伴有轻微的磨粒磨损,且随着石墨含量的增加逐渐转变为多次塑变、层脱和微切削磨损;在载荷增加后,脆性断裂、微观切削和粘着为其主要的磨损机理,且随着石墨含量的增加逐渐转变为微观切削和脆性剥落。
In order to reduce the friction coefficient and enhance the wear resistance of TiC / Ni-based alloy composite coatings, graphite / TiC / Ni-based alloy (GTN) coatings were prepared on the surface of 45 # steel by plasma spraying. The effect of graphite content on the microstructure and tribological properties of GTN coatings was investigated. The results show that the addition of graphite effectively reduces the friction coefficient of the coating and enhances its wear resistance. The 6.56GTN coating and the 12.71GTN coating exhibit excellent friction and wear resistance under low load and high load respectively. Under low load, the wear mechanism of GTN coating is mainly manifested as multiple plastic deformation wear, accompanied by slight abrasive wear, and gradually transformed into multiple plastic deformation, delamination and micro-cutting wear with the increase of graphite content ; Brittle fracture, micro-cutting and adhesion are the main wear mechanisms after the load increases, and gradually change into micro-cutting and brittle flaking with the increase of graphite content.