Abstract: Mo-Cu alloys have the advantages of high conductivity and thermal conductivity, low expansion rate, etc. They were widely used in electro-nic packaging materials, heat sink materials, integrated circuit heat-dissipation components and other fields. Using copper nitrate, ammo-nium molybdate, glucose and urea as raw material, nano Mo-30Cu composite powders were prepared by low-temperature self-propagating and reduction method. Subsequently, different copper nitrate and urea, glucose ratio precursor powder and powder after reduction were characterized by XRD and SEM. The effect of sintering process on microstructure and properties of Mo-30Cu alloy was investigated. The results showed that the best mole ratio of copper nitrate to urea and glucose is 1∶2 and 1∶0.3, respectively. Mo-30Cu composite powders were fine and uniform, and Mo and Cu phases are evenly distributed, and the average diameter of powders is about 70 nm. The best sintering process is at 1 300℃ for 2 h. The alloy had a density of 98.3%, a bending strength of 1 022 MPa, a hardness of 221HV, a electrical conductivity of 22 MS/m, a thermal conductivity of 195 W·m-1·K-1,and a thermal expansion coefficient of 10.5×10-6 K-1.The microstructure is fine and uniform, and Mo and Cu are even.The fracture morphology showed ductile fracture.
郭世柏, 易正翼, 阙忠游, 孙靖. 低温自蔓燃和还原法制备纳米Mo-30Cu复合粉末及其烧结性能[J]. 材料导报, 2020, 34(18): 18114-18118.
GUO Shibo, YI Zhengyi, QUE Zhongyou, SUN Jing. Preparation of Nano Mo-30Cu Composite Powders by Low Temperature Self-Propagating and Reduction Method and Their Sintering Properties. Materials Reports, 2020, 34(18): 18114-18118.
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