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采用挤压铸造法制备了氧化铝短纤维(80％Al_2O_3·20％SiO_2)、石墨(Gr)混杂增强铝基复合材料。对其组织、强度、摩擦磨损特性等进行了研究。发现由氧化铝短纤维和石墨混杂增强的铝基复合材料具有优良的摩擦性能。这种复合材料随着其中石墨含量的增加,摩擦系数明显降低。在短纤维含量较高的铝基复合材料中,石墨的作用尤为突出。在大载荷下,石墨能显著降低短纤维增强铝基复合材料的摩擦系数和磨损量。从实验和分析来看,石墨改变了复合材料的磨损类型。
Alumina short fibers (80% Al 2 O 3 · 20% SiO 2) and graphite (Gr) hybrid reinforced aluminum matrix composites were prepared by extrusion casting. Its organization, strength, friction and wear characteristics were studied. It was found that aluminum matrix composites reinforced with alumina staple fibers and graphite have excellent tribological properties. With the increase of graphite content in this kind of composite material, the friction coefficient obviously decreases. In the high short-fiber content of aluminum matrix composites, the role of graphite is particularly prominent. At high loads, graphite can significantly reduce the friction coefficient and wear of short fiber reinforced aluminum matrix composites. From the experimental and analytical point of view, graphite changes the type of composite wear.