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采用底部真空无压浸渗新工艺制备了β-SiCp/Al复合材料。SiC预制体在1373 K高温氧化及被熔融铝浸渗时加入Si、Mg合金元素。通过金相显微镜及SEM表征了复合材料的表面和断口形貌。结果表明,SiC颗粒在基体铝中分布均匀,SiC预制体浸渗完全。XRD分析表明,复合材料中的主晶相为SiC和Al,存在Mg2Si,MgAl2O4界面产物,没有出现Al4C3脆性相。复合材料的力学性能研究表明,复合材料的磨损机制为磨粒磨损和黏着磨损;随着SiC体积分数的增加,复合材料的磨损率下降,硬度上升。
Β-SiCp / Al composites were prepared by a new vacuum pressureless infiltration process at the bottom. SiC preform is oxidized at 1373 K and infiltrated by molten aluminum, Si and Mg alloy elements are added. The surface and fracture morphology of the composites were characterized by optical microscope and SEM. The results show that the SiC particles are uniformly distributed in the matrix aluminum and the infiltration of the SiC preform is complete. XRD analysis showed that the main crystal phase in the composite is SiC and Al, and the interface products of Mg2Si and MgAl2O4 exist, and the brittle phase of Al4C3 does not appear. The mechanical properties of the composites show that the wear mechanism of the composites is abrasive wear and adhesive wear. With the increase of SiC volume fraction, the wear rate of the composites decreases and the hardness increases.