熔渗温度对Si/Al复合材料组织及性能的影响  

Effect of infiltration temperature on microstructure and properties of Si/Al composite

作　　者：张建云[1] 韩建平[1] 张学辉[1] 崔霞[1] 周贤良[1] 

机构地区：[1]南昌航空大学材料科学与工程学院,江西南昌330063

出　　处：《功能材料》2012年第6期806-808,共3页Journal of Functional Materials

基　　金：江西省教育厅科学技术基金资助项目(GJJ11522)

摘　　要：采用无压熔渗法制备Si/Al复合材料,研究了熔渗温度对所制备Si/Al复合材料Si相形貌的影响,对Si相间基体合金的凝固组织进行了分析,测试了Si/Al复合材料热膨胀系数、热导率及抗弯强度。结果表明,在相同熔渗时间下,随着熔渗温度升高,所制备Si/Al复合材料中Si相从颗粒状到形成网络状。Si相间的Al-Si基体合金中不再是典型的初生相和共晶组织,而是出现了类似离异共晶的结晶现象,即初晶Si和共晶Si是在原存的Si相上结晶长大。XRD分析显示在所制备复合材料中只有Si相和Al相。随着熔渗温度升高复合材料热膨胀系数、热导率以及抗弯强度均出现下降。Si/A1 composite was fabricated by pressureless infiltration. Effect of infiltration temperature on Si phase shape in prepared Si/A1 composite was investigated. The matrix alloy solidification microstructure in Siphase interspace was analyzed. The coefficient of thermal expansion, thermal conductivity and bending strength of Si/A1 composite were tested. The results show that at same infiltration time, with infiltration temperature increasing Si phase is from particle shape to network shape in prepared Si/A1 composite. The microstructure of A1-Si matrix alloy in Si phase interspace is no typieal primary phase and eutectie mierostructure. There is a phe-nomenon similar to the separate-eutectic microstructure. Primary Si phase and eutectic Si phase crystallize and grow at origin Si phase. XRD analyzing shows that there are Si phase and A1 phase in prepared Si/A1 composite. With infiltration temperature increasing, the coefficient of thermal expansion, thermal conductivity and bending strength of Si/A1 composite decrease.

关 键 词：Si/Al复合材料 无压熔渗 显微组织 性能 

分 类 号：TG333[金属学及工艺—金属压力加工]