Al(Ni)含量对钛合金激光熔覆AlNiMoSi复合涂层摩擦学性能的影响

研究含Al、Si元素涂层的摩擦学性能可为其应用提供重要的理论参考。以Al、Ni、Mo、Si粉末为原料,采用激光熔覆技术在Ti6Al4V合金表面制备了Al质量分数分别为20%(Ni的为40%),30%(Ni的为30%),40%(Ni的为20%)的AlNiMoSi复合涂层,分别命名为20Al、30Al、40Al复合涂层。采用XRD、SEM和EDS分析了涂层的物相和显微组织,并测试了复合涂层的干滑动磨损性能。结果表明:20Al、30Al和40Al复合涂层的平均摩擦系数和磨损率分别为0.380,0.258,0.325和9.36×10~(-5),8.43×10~(-5),1.05×10~(-4)mm~3/(N·m),30Al复合涂层的磨损性能最好,主要是因为该涂层中TiC和Ti3Al含量较高;20Al和40Al复合涂层的磨损机理主要为黏着磨损和磨粒磨损,30Al复合涂层的磨损机理主要为轻微的磨粒磨损。

Effect of Al(Ni) Content on Tribological Properties of Laser Cladding AlNiMoSi Composite Coatings on Ti6Al4V Alloy

The AlNiMoSi composite coatings with 20％(mass fraction,similarly hereinafter) Al(40％Ni),30％Al(30％Ni) and 40％Al(20％ Ni) were fabricated by laser cladding technology and using Al,Ni,Mo and Si powders as raw materials.Based on Al content of coatings,the obtained coatings were named as 20Al,30Al and 40Al,respectively.In addition,the phase composition and microstructure of coatings were characterized by XRD,SEM and EDS.The dry sliding wear tests of the composite coatings were evaluated.Results showed that the average friction coefficients and wear rates of 20Al,30Al and 40Al composite coatings were 0.380,0.258,0.325 and 9.36× 10-5,8.43× 10-5,1.05× 10-4 mm3/(N·m),respectively.Among them,30Al composite coating had the best anti-wear performance,owing to its higher contents of TiC and Ti3Al.Besides,the wear mechanisms of 20Al and 40Al composite coatings were adhesion wear and abrasive wear,while that of 30Al composite coating was slightly abrasive wear.