论文部分内容阅读
采用挤压铸造法制备了SiC颗粒体积分数分别为50%、55%和60%的SiCp/Cu复合材料,并分析测试了体积分数和热处理状态对复合材料热膨胀性能的影响规律。显微组织观察表明:复合材料的组织致密,SiC颗粒分布均匀。热膨胀性能测试表明:铸态复合材料的平均线热膨胀系数(20～100℃)介于8.8～9.9×10-6/℃之间,且随SiC含量的增加而降低,实验值与Kerner模型预测值相符。退火处理可以减小基体中的热残余应力,有助于降低复合材料的热膨胀系数,退火态复合材料的热膨胀系数实验值与Turner模型预测值相符。
SiCp / Cu composites with SiC particles volume fraction of 50%, 55% and 60% were prepared by squeeze casting. The effects of volume fraction and heat treatment on the thermal expansion properties of the composites were analyzed. Microstructure observation shows that: the composite structure of dense, uniform distribution of SiC particles. The results of thermal expansion tests show that the average linear thermal expansion coefficient (20 ~ 100 ℃) of as-cast composites is between 8.8 ~ 9.9 × 10-6 / ℃ and decreases with the increase of SiC content. The experimental values are in agreement with the Kerner model predictions Match. Annealing treatment can reduce the thermal residual stress in the matrix and reduce the thermal expansion coefficient of the composites. The thermal expansion coefficient of annealed composites is in good agreement with the Turner model.