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采用反应熔渗法在低压力下制备高体积比SiCp/Al复合材料 ,并研究其热学性能。临界熔渗压力与SiC颗粒尺寸及反应程度有关。Al熔体在无压或低压力下能渗入SiC预成形坯 ,制备出组织均匀的高体积比SiCp/Al复合材料 ,SiC颗粒体积分数约 5 0 %。界面反应对SiCp/Al复合材料的CTE的影响很小 ,但会降低SiC/Al的界面传热系数 ,影响材料的导热性能。降低熔渗温度和缩短保温时间可缓减界面反应程度 ,提高复合材料的热学性能 ,CTE在 10× 10 - 6 /K以下 ,复合材料的导热系数达到 164(W·m- 1 ·K- 1 )。
Reactive infiltration method was used to prepare SiCp / Al composites with high volume ratio at low pressure and their thermal properties were studied. The critical infiltration pressure is related to the SiC particle size and reaction degree. Al melt can infiltrate into the SiC preform under no pressure or low pressure to prepare uniform high volume ratio SiCp / Al composites, the volume fraction of SiC particles is about 50%. The interfacial reaction has little effect on the CTE of SiCp / Al composites, but it decreases the interfacial heat transfer coefficient of SiC / Al and affects the thermal conductivity of the composites. Decreasing the infiltration temperature and shortening the holding time can reduce the interfacial reaction and improve the thermal properties of the composites. The CTE is below 10 × 10-6 / K and the thermal conductivity of the composites reaches 164 (W · m -1 · K -1 ).