射频等离子体制备球形钽粉及其性能表征

Preparation and characterization of spherical tantalum powder by radio frequency plasma

摘要: 采用射频等离子体对不规则状冶金级钽粉进行了球化处理, 研究了粉末供给速率对球化率的影响。结果表明, 当粉末供给速率为10 g·min^-1时, 钽粉的球化率可到90%以上; 球化后的钽粉球形度良好、表面光洁, 内部无空心缺陷, 流动性为13.84s·(50 g)^-1, 松装密度从5.87 g/cm³增加到9.35 g/cm³, 达到了增材制造技术的要求; 球化后的粉末杂质元素含量和物相组成没有发生变化。

Abstract: Spherical tantalum powders were fabricated by radio frequency (RF) plasma spheroidization process, the effect of powder feeding rate on the spheroidization efficiency was investigated. The results indicate that, the spheroidization efficiency can be above 90% as the powder feeding rate is 10 g·min^-1; the obtained tantalum powders after spheroidization exhibit the good sphericity, smooth surface, and narrow size distribution without the internal hollow defects; the flowability of the obtained tantalum powders increases to 13.83s·(50 g)^-1, and the apparent density increases from 5.87 g/cm³ to 9.35 g/cm³, meeting the requirements of additive manufacturing technology; the impurity content and phase composition of tantalum powders after spheroidization remain unchanged.