活化元素Co对Mo-Cu合金组织和性能的影响

摘要

采用机械合金化制备Mo-18Cu复合材料,利用SEM、XRD和万能试验机研究了Co含量对Mo-18Cu合金的相对密度、力学性能、断口形貌组织、导热和导电性能的影响.试验结果表明,活化元素Co的添加降低了Mo-18Cu合金的烧结致密化温度100℃,增加了合金的相对密度、抗弯强度及硬度,但导电和导热性能降低.含Co 2.0wt%Mo-18Cu合金在1250℃烧结2h获得较好的综合性能,合金的相对密度、抗弯强度、硬度、电阻率和热导率分别为99.1%,960MPa,69HRA,2.06×10-7Ωm和142W·m-1·K-1.显微组织为均匀细小的网络结构.%Mo-18Cu composites with different contents of activating element Co were fabricated by mechanical alloying. Effects of activating element Co content on the relative density, mechanical properties, fracture morphology, resistivity and thermal conductivity of Mo-Cu alloy were investigated. The results show that the sintering temperature of densifing the alloy was decreased by 100℃ when Co was added, and the relative density, hardness and bending strength were increased. However, the resistivity and thermal conductivity were reduced with adding Co. Sintered at 1250℃ for 2 hours, Mo-18Cu alloy with 2.0wt％ Co had a relative density of 99. 1％, hardness 69HRA, bending strength 960MPa, resistivity 2.06 × 10-7Ωm, thermal conductivity 142W · m-1 · K-1 , respectively. The homogeneous and fine network-like microstructure could be obtained.