射频等离子体制备球形钨粉的研究

通过射频等离子体球化处理工艺，以不规则形状钨粉为原料，制备了球形钨粉，并研究了加料速率和粉末粒度对粉末球化率的影响。采用扫描电子显微镜、X射线衍射和激光粒度分析仪对球化处理前后粉末的形貌、物相和粒度分布进行了测试和分析。结果表明：粒度在5.5~26.5 μm范围的不规则形状钨粉，经等离子球化处理后得到表面光滑、分散性好、球化率可达100%的球形钨粉。球化处理后，粉末的粒度略微增大。随加料速率的增加，钨粉的球化率降低。随着钨粉球化率的提高，粉末的松装密度和流动性得到显著改善。松装密度由6.80 g/cm3 提高到11.5 g/cm3，粉末流动性由14.12 s/50 g提高为6.95 s/50 g

Preparation of Spherical Tungsten Powder by RF Induction Plasma

Spherical tungsten powder was prepared by radio frequency(RF) plasma with irregular tungsten powder as starting material.The effect of feeding rate and particle size on the spheroidization efficiency was studied.The phase composition,morphologies and particle size distributions of the powder before and after spheroidization were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM) and laser micron sizer(LMS).The results show that the spherical tungsten powder can be obtained from irregu...