SiC/C-Cu复合材料的载流磨损性能

摘要

SiC/C-Cu composites with different SiC contents were fabricated by powder metallurgic method. The effect of SiC content on microstructure and physical properties of the composite materials were investigated. The tests were carried out using HST-100 tribo-tester to study the effects of velocity, current density and SiC content on wear rate and wear mechanism. The experimental results indicate that, SiC particles distributes uniformly in the Cu matrix, with increasing SiC content the hardness and porosity of the composites increase, while density and conductivity decrease. The anti-wear performance of the composites can be improved by adding SiC particles. And the wear rate of the composites increases with increasing velocity and current density, as well as increases first and then decreases with increasing SiC content. The composite with SiC content of 2%exhibits superior electrical wear property. The adhesive wear of the Cu matrix can be reduced by adding SiC particles. Frictional particle wear and arc erosion are the dominant mechanism.%采用粉末冶金法制备 SiC/C-Cu 复合材料，研究 SiC 颗粒含量对该材料组织结构与物理性能的影响，并在HST-100载流摩擦磨损试验机上进行载流磨损试验，研究摩擦速度、电流密度与SiC颗粒含量对SiC/C-Cu复合材料磨损率的影响以及磨损机理的变化。结果表明：SiC颗粒均匀分布于铜基体中。随SiC含量增加，复合材料的硬度和孔隙率都逐渐增大，密度和导电率降低。添加SiC颗粒可增强C-Cu复合材料的抗磨损性能，材料的磨损率随摩擦速度和电流密度增加而增加，随SiC含量增加呈先降低后上升的趋势，含2%SiC(质量分数)的SiC/C-Cu 复合材料具有优异的抗载流磨损性能。添加 SiC 颗粒可减少摩擦磨损过程中铜基体的粘着磨损，磨损机理主要为磨粒磨损和电弧侵蚀磨损。