碳纤维织物增强铜基复合材料的显微结构及其热物理性能

Microstructure and Thermal Physical Properties of Carbon Fiber Fabric Reinforced Copper Matrix Composite

采用无压浸渗法制备碳纤维织物增强铜基复合材料,利用扫描电子显微镜(SEM)和X射线衍射仪(XRD)分析显微结构和相组成,并测定热导率及热膨胀系数。研究结果表明:碳纤维在铜合金基体中分布均匀,润湿良好,微观组织无明显空洞缺陷。碳与铜两相之间形成ZrC层,随着Zr含量增加,复合材料的ZrC界面层厚度增大,热导率增加,热膨胀系数降低。当Zr的质量分数为25%,复合材料水平方向和垂直方向的热导率达到最高值分别为153和102W/m·K;当Zr的质量分数为30%,复合材料水平方向和垂直方向热膨胀系数达到最低值,分别为5.9×10-6和13.1×10-6/K。

Carbon fiber fabric reinforced copper matrix(Cf/Cu)composites were fabricated by pressureless infiltration method.Microstructure and phase composition of the composites were observed,and the coefficient of thermal conductivity and thermal expansion of the composite materials were measured.The results show that carbon fibers were distributed uniformly in the matrix of copper alloy,a good wettability of the fibers by copper matrix is observed and no obvious microscopic defects;A ZrC layer was formed between the Cu and carbon;With the increase of Zr content,the ZrC interface layer becomes thicker.Increasing Zr content has also led to increasing thermal conductivity and decreasing thermal expansion coefficients of the composites.When the mass fraction of Zr is 25%,the horizontal and vertical coefficient of thermal conductivity of the composite reaches the highest value of 153W/m·K and 102W/m·K respectively;When the mass fraction of Zr is 30%,the horizontal and vertical coefficient of thermal expansion of composite reached the lowest value of 5.9×10-6/K and 13.1×10-6/K respectively.