采用无压熔渗法制备Si／A1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.
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