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以铬、石墨半烧结体电极为工具电极,利用液相脉冲放电(EDC)技术,在45钢表面制备出以Cr7C3为主相的表面改性层,并通过正交设计优化了放电工艺参数,研究了改性层在300、450、600℃下的摩擦学特性。结果表明:在载荷一定时,该改性层的摩擦系数随试验温度的上升呈下降的趋势。摩擦系数的变化与Cr-C改性层的高温磨损行为有关,300℃时,该改性层的磨损方式主要表现为磨粒磨损;而450℃下,主要表现为氧化磨损和轻微粘着磨损;600℃条件下则主要为氧化磨损和氧化膜的变形与脱落。
Using Cr and graphite semi-sintered electrode as the tool electrode, the surface modified layer with Cr7C3 as the main phase was prepared by liquid phase pulse discharge (EDC) technique. The parameters of discharge process were optimized by orthogonal design. The tribological properties of modified layer at 300, 450 and 600 ℃ were investigated. The results show that the friction coefficient of the modified layer tends to decrease with the increase of the test temperature under certain load. The change of friction coefficient is related to the high temperature wear behavior of Cr-C modified layer. At 300 ℃, the wear mode of the modified layer is mainly abrasive wear; while at 450 ℃, the wear behavior of the modified layer is mainly attributed to oxidative wear and slight adhesive wear; 600 ℃ under the conditions of the main oxidation wear and oxide film deformation and loss.