石墨增强体对SiC/Gr/Al复合材料干摩擦磨损性能的影响

Effect of Graphite Particle Reinforcement on Dry Sliding Wear of SiC/Gr/Al Composites

摘要:

采用挤压铸造技术制备不同粒径石墨颗粒增强的40%SiC/5%Gr/Al复合材料，研究了石墨颗粒对摩擦系数和磨损率的影响。结果表明，随着石墨的加入，复合材料的摩擦系数降低，磨损抗力提高170~340倍。另外，石墨颗粒粒径的增加也导致磨损抗力的提高，这是由于在干摩擦的过程中形成由铁的氧化物、石墨及SiC 等组成的具有润滑性质的薄膜

Abstract:

The 40%SiC/5%Gr/Al composites with various-sizes graphite addition were fabricated by squeeze casting technology, and their friction and wear properties were investigated. Results showed that after the addition of graphite the friction coefficient of composites decreased and the wear resistance increased by 170 to 340 times. In addition, wear resistance was improved with increasing of graphite particle size, which is attributed to the enhancement of integrity of lubrication tribo-layer composed of a complex mixture of iron oxides, graphite as well as fractured SiC particles and some fine particles containing aluminum.