喷射沉积SiCP/Al-Si复合材料干滑动磨损性能的研究

采用喷射沉积法制备SiCP体积分数为15％,Si质量分数分别为7％,13％和20％的SiCP/Al-Si复合材料,并经热挤压致密化加工.采用环-块式摩擦试验机对复合材料的干滑动摩擦磨损性能进行了测试分析,滑动速度为1 m/s,外加戴荷分别为10,50,100,120,150、200和220 N,同时对摩擦层的显微组织和形貌以及复合材料磨损机制进行了分析.结果表明,随着复合材料基体中Si含量的增加,复合材料的磨损性能增强,在低戴荷下,复合材料主要以氧化磨损和磨粒磨损为主,在高载荷下,磨损机制则转变为粘着磨损,但对于SiCP/Al-20％Si复合材料仍以氧化磨损为主,并伴有轻微的粘着磨损.

Dry Sliding Wear Properties of Spray Formed and Hot Extruded SiCp /Al-Si Composites

Aluminium-based composites containing 7%, 13% ,20%Si contents and 15vol% of SiCp were fabricated by spray deposition technique and followed by hot extrusion. The dry sliding wear performance of SiCP/Al-Si composites was investigated. Dry sliding wear tests have been performed using a block-on-ring type apparatus under different normal loads of 10, 50, 100,120,150,200 and 220 N and at a constant sliding speed of 1 m/s. The microstructures, morphologies and phases of worn Surfaces were analyzed by optical microscope (OM), scanning electron microscope (SEM) and energy-dispersive X-ray microanalysis (EDX), respectively.The results have shown that Al-20%Si/SiCp composite has better wear properties in the applied load range and the transition load increases with silicon content increasing. At low test load (50 N), the main wear mechanism is oxidation wear and abrasive wear for three composites. Adhesive wear becomes the main wear mechanism for SiCp/Al-7Si at 120 N and SiCp/Al-13Si at 200 N. But for SiCp/Al-20Si at 220 N, the main wear mechanism is still oxidation wear, and has a minor adhesive wear.