(上海工程技术大学 材料工程学院，上海 201620)
摘 要: 在真空环境下，将铜熔渗到钼纤维预制体中，制得纤维结构的致密的钼铜复合材料。通过控制钼纤维预制体的表观密度，可以方便地改变钼铜复合材料的成分组成。采用扫描电镜和金相显微镜观察材料的微观组织形貌，研究工艺参数对钼铜复合材料的成分、密度、硬度和电导率的影响。结果表明：采用无纺技术结合模压成形获得的钼纤维预制体可形成较宽范围的孔隙度，从而得到钼含量不同的钼铜复合材料；熔渗工艺制得的钼铜复合材料具有致密均匀、特征明显的纤维结构组织；所得钼铜复合材料的致密度均达到99%以上。当钼质量分数为84.77%时，得到的材料致密度达到最大值99.43%，其硬度为226.7HV，电导率为16.5 MS/m。
关键字: 纤维结构；钼铜复合材料；钼纤维；熔渗
（School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China）
Abstract:In vacuum environment, the dense fiber-structured molybdenum-copper (Mo-Cu) composites were fabricated by infiltrating liquid copper into molybdenum fibrous preform. By controlling the relative density of molybdenum fibrous preform, the composition of Mo-Cu composites could be easily changed. The microstructure and morphologies of Mo-Cu composites were observed by scanning electron microscopy and optical microscopy, and the effects of process parameters on the composition, physical and mechanical properties were investigated. The results indicate that molybdenum fibrous preform obtained by non-woven technology with mould pressing formation has wider range of porosity, Mo-Cu composite with different molybdenum contents are obtained. The Mo-Cu composites have dense and homogeneous structure with obvious fibrous character by infiltration. The relative density of the composites is above 99%. When the mass fraction of molybdenum is 84.77%, the maximum relative density reaches 99.43% for fiber-structured Mo-Cu composites. Meanwhile, their hardness and electrical conductivity are 226.7HV and 16.5 MS/m, respectively.
Key words: fibrous structure; molybdenum-copper composites; molybdenum fiber; infiltration
