【摘要】 采用氩气雾化制备Cu-3Ag-0.5Zr合金粉末,对粉末的粒径分布、氧含量、松装密度、流动性、形貌、物相组成和显微组织等进行表征。结果表明,Cu-3Ag-0.5Zr合金雾化粉末球形度较高,粒径呈正态分布,90%（体积分数）的粉末粒径小于200μm,中位径Dv_（50）约为49.9μm。小于50μm,50～106μm以及大于106μm这3个粒级的粉末氧含量（质量分数）分别为0.067%,0.039%和0.013%,松装密度分别为4.39,4.95和5.02 g/cm³,粉末流动性分别为16.59,15.96和15.62 s/50 g。粉末组织细小均匀,平均晶粒尺寸为3.82μm。大粒径粉末为树枝晶组织,小粒径粉末为等轴晶组织,没有观察到明显的Ag或Zr等第二相析出,形成了成分均匀的过饱和固溶体。更多还原

【Abstract】 Cu-3Ag-0.5Zr alloy powder was fabricated by argon gas atomization, and its particle size distribution, oxygen content, apparent density, flowability, morphology, phase and microstructure were investigated. The results show that argon gas atomized Cu-3Ag-0.5Zr alloy powders are almost spherical and normal distribution. 90% of particle size of the powders is less than 200 μm. The median diameter Dv_（50） is about 49.9 μm. Oxygen content（mass fraction） of Cu alloy powders with size less than 50 μm, between 50-106 μm and more than 106 μm are 0.067%, 0.039% and 0.013%, the apparent density are 4.39, 4.95 and 5.02 g/cm³, and the flowability are 16.59, 15.96 and 15.62 s/50 g, respectively. The microstructure of the powders is fine and homogeneous, and the average grain size is 3.82 μm. The microstructure of large particle size powders is dendritic crystal structure and the microstructure of small particle size powders is equiaxed crystal structure. There is no obvious Ag or Zr second-phase precipitation in powder matrix, and the structure of powder is a homogeneous supersaturated solid solution.更多还原