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用喷射共沉积技术制备了含35vol%SiC的SiCp/Al复合材料。用扫描电镜观察了这种复合材料沉积态的孔隙和SiC颗粒分布。在拉伸实验机上测量了不同工艺条件下制备的SiCp/Al的应力-应变曲线,用扫描电镜观察了雾化前先抽真空、再充氮气保护工艺条件下得到的SiCp/Al经热压后拉伸试样的断口形貌。实验结果表明,沉积态复合材料孔隙数量较少、尺寸较小,SiC分布均匀。雾化前抽真空并充氮气、热压均可提高屈服强度、拉伸强度和伸长率。拉伸断口的扫描电镜观察结果表明,材料的断裂方式为微孔聚集型断裂。
SiCp / Al composites containing 35vol% SiC were prepared by spray co-deposition technique. The distribution of the as-deposited pores and SiC particles in this composite was observed by SEM. The stress-strain curves of SiCp / Al prepared under different process conditions were measured on a tensile testing machine. The vacuum stress before the atomization was observed by scanning electron microscopy. The SiCp / Al obtained after the nitrogen gas protection process was hot pressed Tensile specimen fracture appearance. The experimental results show that the composites have less pores, smaller size and uniform SiC distribution. Vacuum and nitrogen before atomization, hot pressing can improve the yield strength, tensile strength and elongation. The results of scanning electron microscopic observation of the tensile fracture show that the fracture mode of the material is micropore aggregation type fracture.