论文部分内容阅读
采用高温焙烧加酸洗的处理工艺对SiC颗粒表面进行处理,利用真空热压法制备SiC_P/Al-25Si复合材料,借助扫描电镜对粉末形貌及试样组织进行表征,采用X衍射仪对表面处理态SiC进行物相分析,测试了该复合材料的抗拉强度及热膨胀系数,研究了SiC颗粒表面状态及形貌对复合材料微观组织、抗拉强度及热膨胀系数的影响。结果表明,SiC颗粒经高温焙烧加酸洗处理后,SiC_P/Al-25Si复合材料中SiC颗粒与基体结合良好,材料致密度增大,同时该复合材料的抗拉强度明显提高,热膨胀系数降低。
The surface of SiC particles was treated by high temperature roasting and pickling process. The SiC_P / Al-25Si composite was prepared by vacuum hot pressing. The morphology and microstructure of the samples were characterized by scanning electron microscopy. Phase analysis of the treated SiC was carried out. The tensile strength and thermal expansion coefficient of the SiC were measured. The influence of SiC particle surface morphology and morphology on the microstructure, tensile strength and thermal expansion coefficient of the composite was investigated. The results show that SiC particles are bonded with SiC matrix matrix by high temperature roasting and pickling, and the density of the SiC particles increases with the addition of SiC. The tensile strength and the coefficient of thermal expansion of the SiC / Al-25Si composites decrease obviously.