纳微米SiC_p/Al-Si复合材料的摩擦磨损性能

Friction and Wear Properties of Nano/Micro SiC Particles Reinforced Aluminum Composites

通过真空热压烧结工艺制备了单一纳米、单一微米及其混合颗粒增强的Al-Si复合材料,测试了这些颗粒增强AlSi复合材料的摩擦磨损性能,并分析了其磨损机理。结果表明,与基体材料相比,颗粒增强Al-Si复合材料的体积磨损量明显降低,当纳米SiC_p含量为3%时,随着微米SiC_p含量的增加,纳微米SiC_p/Al-Si复合材料的体积磨损量先减小后增加。当增强颗粒含量为3%的纳米+15%的微米时,复合材料的体积磨损量最小,耐磨性较基体材料提高58.2%。利用扫描电镜对纳微米SiC_p/Al-Si复合材料的磨损形貌进行观察,发现复合材料的磨损机制主要为磨粒磨损。

Al-Si composites reinforced with single nano,single micro and hybrid nano-micro SiC particles were fabricated by vacuum hot pressing sintering.The friction and wear properties of the particles reinforced Al-Si composites were tested,and the wear mechanism was described.The results reveal that compared with that of the Al-Si matrix alloy,wear volume of the composites prepared was decreased greatly.At the amount of 3% SiC nano-particles,with increasing in the addition of SiC micro-particles,the wear volume of the composites is decreased firstly and then increased.The wear volume of the composites with（3%nm＋15%μm）hybrid nano-micro SiC particles reinforced reaches minimum value,and wear resistance is improved by 58.2% compared with those of the Al-Si matrix alloy.The wear morphology of the nano-micro SiC particles reinforced composites was observed by SEM（scanning electron microscope）,and it is found that the wear mechanism is characterized mainly by abrasive wear.