高体积SiC/Al复合材料的热处理与力学性能  

Heat Treatment and Mechanical Property of High-fraction SiC/Al Composite

作　　者：袁曼[1] 马春雪[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《热加工工艺》2013年第4期93-96,共4页Hot Working Technology

基　　金：国家自然科学基金资助项目(60776019)

摘　　要：采用气压浸渗法制备高体积分数的SiC/Al复合材料,测试了其SiC预制型经过1200℃高温氧化4 h得到的该复合材料的抗弯强度,最高可达422 MPa,分析了界面产物以及结合状况;同时,对复合材料进行T2态和T6态热处理,T2态处理后,该复合材料抗弯强度降低,T6态处理后,其抗弯强度最高可达462 MPa,约提高9%。采用激光拉曼光谱分析了两种不同热处理后的力学性能变化的原因,T2态处理消除了复合材料的内应力,而T6态复合材料中仍然存在内应力;对比分析了两种不同热处理下的断口形貌,进行了该复合材料不同强度的评析。SiC/A1 composite was fabricated by gas pressure infiltration, and the bending strength of the composite of which SiC preforms oxidized at 1200 ℃ for 4 h was tested, the maximum value could reach 422 MPa. Besides, the interfacial reaction products and interfacial bonding were analyzed. T2 and T6 heat treatment were taken to SiC/A1 composite, the bending strength decreases after T2 treatment; rather not as T2 state, the bending strength after T6 treatment could reach 462 MPa, which increased about 9%. The raman spectrum was used to analyze the reason of the change of bending strength. When the composite was treated by T2 state, the internal stress was relieved; but the composite treated by T6 state, there still was certain internal stress in it. The different bending strength was commented by the fracture micrographs of SiC/A1 composite.

关 键 词：SIC/AL复合材料 抗弯强度 热处理 拉曼光谱 断口形貌 

分 类 号：TB333[一般工业技术—材料科学与工程]