【摘要】 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 )。更多还原

【Abstract】 The SiC p/Al composite with high SiC particle content is prepared by reactive infiltration under low pressure, and the thermal properties of the composite are investigated. The critical pressure for preparation is related to the dimension of SiC particles and extent of the reaction. The molten Al is infiltrated into the pre-formed SiC base, so the SiC p/Al composite with homogeneous microstructure and high SiC particle content is produced, the SiC particle content is up to 50%. There is slightly effect of interface reaction on CTE of the product, but the thermal conductivity is reduced by the interfacial reaction. To lower infiltration temperature and decrease retention time at high temperature are two effective ways to slow the interfacial reaction and increase the thermal properties of the material, if CTE is controlled below 10×10 -6 /K, the thermal conductivity factor will achieve 164(W·m -1 ·K -1 ).更多还原