硬质涂层与齿轮钢的摩擦性能研究

采用阴极多弧离子镀在M42工具钢表面制备了Al66Cr34N和Ti₆₂Al34Si4N两种硬质涂层, 并在室温大气环境下采用球/盘式摩擦磨损仪研究它们同40Cr齿轮钢的摩擦磨损行为。采用表面接触角测试仪OCA40Micro、3D表面形貌仪、扫描电子显微镜、电子能谱分析了涂层磨痕, 探讨了两种涂层与齿轮钢对摩的磨损机理。结果表明:两种涂层与40Cr齿轮钢摩擦时, 失效的主要机理均为粘着磨损, 伴随着氧化磨损。在与40Cr对磨时, Ti₆₂Al34Si4N涂层与40Cr的亲和力强, 摩擦过程中接触面温度较高, 容易融合形成高结合力粘结节点;表现高的摩擦系数0.6~0.7, 和初始阶段高的磨损率 (最高7.5×10^-15m³/N·m)。Al66Cr34N涂层与40Cr的亲和力较弱, 摩擦系数0.45~0.6, 初始磨损率最低为2×10^-16m³/N·m。

Tribological Properties Against Gear-Steel of M42 Tool Steel Surface-Modified with Hard Coatings

Thetribological properties of the substrate of M42 tool steel surface-modified with Al₆₆Cr₃₄N and Ti₆₂ Al₃₄Si₄N hard coatings, deposited by cathodic multi arc ion plating, were investigated with X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy and conventional mechanical probes like SFT-2 M disk-onpin rig against 40 Cr gear steelat room temperature.The results show that the adhesive wear accompanied by oxidative wear explained the failure mechanisms of both hard coatings.In sliding against 40 Cr gear-steel, high strength adhesive joints easily formed on the surface of Ti₆₂Al₃₄Si₄Ncoating possibly because of a strong affinity and a high frictional heat; the friction coefficient and highest initial wear-rate were estimated to be 0.6~0.7 and 7.5×10^-15 m³/N·m, respectively.In contrast, the friction coefficient and lowest initial wear-rate of the Al₆₆Cr₃₄N coating were 0.45~0.6, 2×10^-16 m³/N·m, respectively, due to low affinity.