C/Al-40%Cu复合材料的原位热解-热压法制备及微观结构

以聚乙烯醇缩丁醛为碳源,采用原位热解-热压法制备C/Al-40%Cu(体积分数)复合材料,研究了该复合材料的物相组成、微观结构以及界面反应特性。结果表明:复合材料主要由铝相、铜相、原位生成的碳材料以及少量残留的高分子材料组成,碳材料连续存在于铝、铜相颗粒之间,有效抑制了Al2Cu和Al4Cu9等金属间化合物的生成;复合材料的实测密度接近于理论密度,组织中未见明显孔洞,致密程度较高;复合材料界面结合良好,铝相和铜相、铝相和碳材料层之间均发生了元素互扩散,形成了厚度分别为2.0~3.5μm和1.0~1.5μm的扩散层,铜相和碳材料层之间以机械结合方式连接。

Preparation and Microstructure of C/Al-40%Cu Composite by In-situ Pyrolysis and Hot-Pressing Method

With polyvinyl butyral as carbon source,C/Al-40%Cu(volume fraction)composite was prepared by in-situ pyrolysis and hot-pressing method.The phase composition,microstructure and interface reaction characteristics of the composite were studied.The results show that the composite was mainly composed of aluminum phase,copper phase,in-situ produced carbon materials and few residual polymers.The carbon materials continuously existed between aluminum and copper grains,effectively inhibiting the generation of Al2Cu and Al4Cu9 intermetallic compounds.The measured density of the composite was close to the theoretical density,and no obvious pores were observed in the structure,indicating a relatively high densification degree.The interfaces of the composite were well bonded.The elemental interdiffusion occured between the aluminum phase and the copper phase,and between the aluminum phase and the carbon material layer,forming diffusion layers with thicknesses of2.0-3.5μm and 1.0-1.5μm,respectively.The copper phase and the carbon material layer were bonded mechanically.