采用无压熔渗法将Al/Al合金渗透到多孔α-Si3N4中,并对AlN-Si-Al复合材料在50~300°C的热性能进行研究。SEM和TEM结果表明,AlN的晶粒尺寸小于1μm,另外,AlN-Si-Al复合材料还表现出较高的热导率55~107W/(m·K)。采用热导率为107W/(m·K)的商用Al得到的AlN-Si-Al复合材料的热膨胀系数为6.5×10-6K-1。Al的热膨胀系数高达23.6×10-6K-1,而AlN-Si-Al复合材料却具有低的热膨胀系数,其原因是在渗透过程中形成了Si和AlN。 The Al / Al alloy was infiltrated into porous α-Si3N4 by pressureless infiltration method, and the thermal properties of AlN-Si-Al composites at 50 ~ 300 ° C were studied. The SEM and TEM results show that the grain size of AlN is less than 1μm. In addition, the AlN-Si-Al composites also show high thermal conductivity of 55-107 W / (m · K). The AlN-Si-Al composite material obtained using commercial Al having a thermal conductivity of 107 W / (m · K) had a thermal expansion coefficient of 6.5 × 10 -6 K -1. Al has a coefficient of thermal expansion of up to 23.6 × 10 -6 K -1, whereas AlN-Si-Al composites have a low thermal expansion coefficient due to the formation of Si and AlN during the infiltration process.