液固分离法制备金刚石/铝封装材料的组织与性能

摘要

High performance diamond/Al composites for heat dissipation were manufactured by advanced cost-effectiveliquid-solid separation (LSS) technology. The effect of Cu coating on the interface bonding and thermal conductivity ofcomposite materials were researched. The fracture morphology and interfacial behavior of composite materials wereanalyzed by SEM, EMPA and XRD. The result show that the Al2Cu4 compounds form from coating element diffuse andAl matrix, which can enhance the interfacial bonding between the two phases and improve the properties of the materials.After Cu coating, the density of the composites increases by 1.16%, the thermal conductivity increases by 9.50%, thetensile strength increases by 17.39%. The thermal physical properties of Cu-diamond/Al are better than that of CE13(controlled expansion) alloy. Additionally, the experimental data of thermal conductivity and coefficient of thermalexpansion of diamond/Al composites show the similar tendency with those by Maxwell and Kerner models, respectively.%采用高性价比液固分离法(LSS)制备高性能金刚石/铝散热基板,研究金刚石镀铜对复合材料界面结合和导热性能的影响,利用SEM、EMPA、XRD分析复合材料的断口形貌及界面行为.结果表明:镀层元素向基体扩散与基体铝形成Al2Cu4化合物,中间相增强两相界面结合,改善材料性能.金刚石镀铜处理后,复合材料致密度提高1.16%,热导率提高9.50%,抗拉强度提高17.39%,复合材料的热物理性能优于CE13合金的.用Maxwell、Kerner理论模拟预测热导率(TC)、热膨胀系数(CTE)与实际测量结果相一致.