【摘要】 采用挤压铸造方法,制备了高体积分数的Si_p/4032Al复合材料。显微组织观察表明,复合材料组织致密,颗粒分布均匀,材料中没观察到孔洞和缺陷;复合材料的线膨胀系数介于（8．1～12）×10^-6/K之间可调,并且随着增强体含量的增加而降低,退火后线膨胀系数略有降低,Kerner模型能够较好的预测复合材料的线膨胀系数;复合材料的热导率可达103 W/（m·K）,随着增强体含量的增加略有下降,退火处理后热导率略有升高,热导率计算结果均大于测试值。更多还原

【Abstract】 Si_p/Al composites with large content of Si particles are fabricated by squeeze-casting technology.The mierostructure observation shows that the composites are dense and Si particles are distributed uniformly,moreover, no holes and defects are observed within the composites.The linear CTE of Si_p/Al composites lies between （8.1～12 ） 10^-6/K and is increased,with increase of the contents of Si particles and decreased after annealing.Kemer mod- el can predict the coefficient of thermal expansion （CTE） of Si_p/Al composites moderately.The thermal conductivity can reach 103W/（m·K）,which is decreased with increase of the contents of Si particles and increased after annea- ling.The thermal conductivity calculated is higher than that tested.更多还原