(W,Ti)C/石墨/镍基合金复合涂层摩擦磨损性能研究

Research on Friction and Wear Property of (W,Ti)C/Graphite/Ni-Base Alloy Composite Coatings

为了获得既具有自润滑减摩特性又有高耐磨性能的金属摩擦构件表面,提高高接触应力下金属摩擦副的使用寿命和可靠性,运用等离子喷涂技术在45#钢表面制备了(W,Ti)C/石墨/镍基合金复合涂层。研究了室温干摩擦条件下复合涂层的摩擦磨损性能,并用SEM和EDX对磨损表面进行了测试分析。结果表明:复合涂层与Si3N4和GCr15对摩时,摩擦系数分别较纯镍基合金涂层降低了35%和38%,耐磨性分别是后者的3倍和3.5倍;与Si3N4对摩时,复合涂层的磨损机理主要是微观切削、疲劳剥落和硬质相脱落。与GCr15对摩时,其磨损机理主要为粘着磨损、多次塑变磨损和层脱剥离。

In order to obtain the self-lubrication and anti-wear metal surfaces and improve the service life and reliability of metal friction couples under condition of high contact stress,the composite coatings composed of Ni-base alloy,（W,Ti）C and graphite particles are prepared on the surface of No.45 steel by plasma spraying process.The friction and wear properties of the coatings are investigated under the conditions of dry friction conditions at room temperature,and the worn surfaces of the composite coatings are analyzed by SEM and EDX.The results show that the friction coefficients of the composite coating are 35% and 38% lower than those of the Ni-base alloy coatings when it rubs againdt Si3N4 and GCr15,and the wear resistance of the former is 3 and 3.5 times of that of the latter.When the composite coatings rub against Si3N4,its main wear mechanisms are micro-cutting,fatigue flaking,and spalling of hard phase particles.As to GCr15,its wear mechanisms are adhesive wear,multi-plastic wear and delamination.