射频等离子体球化SiO_2粉体的研究

Spheroidization of Silica Powders in a Radio Frequency Plasma

采用射频等离子体球化颗粒形状不规则的二氧化硅粉体,研究了加料速率、颗粒大小等因素对球化率的影响。用光学显微镜观察球化前后颗粒的形貌;用流动仪测定球化后粉体的松装密度。结果显示,球化后的二氧化硅颗粒球形度高,细颗粒长大,并且随着球化率的增大粉体松装密度增加。初步查明加料速率、原料粒度等参数对球化率的影响。在适当的条件下可以得到球化率高、球形度好的粉体。

Spherical silica （Si02） particles were obtained by the process of heating irregularly shaped SiO2 powders under radio frequency plasma （RF plasma） condition. The effect of feed rate and particle size on spheroidization efficiency was studied. Properties of the powders were characterized by optical microscope photograph and apparent density. Because of the collisions between fine melting particles in the plasma torch, the processed powder,s mean diameter is larger than the original one. And the relationship between spheroidization efficiency and apparent density was also discussed.