【摘要】 本文对用挤压铸造法制备的ＳｉＣｗ／Ａｌ复合材料的热膨胀系数和热传导率进行了测试和分析。结果表明：随温度的提高，ＳｉＣｗ／Ａｌ复合材料和铝合金的热膨胀系数均明显增加。经人工时效处理的复合材料热膨胀系数比铸态略有降低，而经－１９６℃深冷处理的复合材料表现出最低的热膨胀系数。另外，随晶须含量的提高，ＳｉＣｗ／Ａｌ复合材料的热膨胀系数明显降低，并且热传导率有所下降。更多还原

【Abstract】 The coefficient of thermal expansion and thermal conductivity of the squeeze casting SiCw/Al composites were measured and analyzed. The experimental results showed that with the increasing temperature, the coefficients of thermal expansion of both SiCw/Al composite and aluminium alloy are increased. The coefficient of thermal expansion of the T6 state SiCw/Al composite is lower than that of the as cast composite, and the deep cooled (-196℃) SiCw/Al composite shows the lowest coefficient of thermal expansion. It is also found that with the increase of the whisker volume fraction, the coefficient of thermal expansion of the SiCw/Al composite is obviously decreased, and the thermal conductivity of the composite is also decreased.更多还原