预制块重熔法制备的SiC/Al复合材料的磨损性能研究

本文采用含高体积分数SiC颗粒预制体在高能超声搅拌下加入铝熔体的方法制备SiCP/Al复合材料,研究了复合材料的微观组织特征、硬度和摩擦磨损性能。实验结果表明：高能超声重熔预制块的方法制备的复合材料基体组织形态均匀细小,SiCP颗粒在复合材料中弥散分布,与基体间结合良好;随着SiCP颗粒体积分数的增加,复合材料的硬度上升,耐磨性显著提高。通过对复合材料磨损表面的SEM观察分析表明,在干摩擦条件下,复合材料的磨损机理为微切削磨损和表层剥落及部分粘着磨损的综合作用。

Study of Wear Property of SiCP/ZL101 Composites Prepared by Re-melted Preform

The SiCP/ZL101 composites were fabricated by adding the SiC-Al preform containing high volume fraction of SiC particles into Al melt and stirring with ultrasonic wave.The morphological character,hardness and friction wear property of the composite were investigated.The experimental results indicatd that a homogeneously refined grains are obtained in the matrix of the composite prepared by remelting SiC-Al perform and ultrasonic wave stirring.The reinforcements are distributed homogeneously in the composite,and an improved combination between the SiC particle and matrix is observed.The hardness is increased and the wear-resistance improved significantly with increasing the volume fraction of SiC particles in the composite.The wear surface of the composite has been observed by SEM,and it is found that tiny cutting abrasion in combination with superficial layer spallation as well as partial adhesive wear are the dominant mechanism for the composite under the dry sliding condition.