【作者】 闫世凯； 袁方利； 胡鹏； 白柳杨； 李晋林；

【Author】 Yan Shikai~(1,2),Yuan Fangli~1,Hu Peng~(1,2),Bai Liuyang~(1,2),Li Jinlin~1 (1 Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100080; 2 Graduate University of Chinese Academy of Sciences,Beijing 100049)

【机构】 中国科学院过程工程研究所； 中国科学院研究生院；

【摘要】 以机械粉碎法制备的角形粉体为原料,用RF等离子体球化和分级技术制备球形陶瓷粉体,用作复合材料的增强体。原料和球化后样品用显微镜、XRD等表征。实验结果表明,RF等离子体法球化SiO₂、Al₂O₃可以得到球化率高的微米、纳米级粉体。在等离子体参数不变的条件下,原料粉体的性质对球化结果有较大影响:粒径较小的原料球化后颗粒长大;喷雾造粒制备的氧化铝,在球化的同时,颗粒进一步致密化,同时粉体的相结构发生了一定变化。研究表明:控制适当的工艺参数,用RF等离子体可以制备出所需球形陶瓷粉体,是工业化制备球形陶瓷粉体较为有效的技术途径。更多还原

【Abstract】 Spherical silica（SiO₂） and alumina（Al₂O₃） powders,which could be used as reinforcement in metal-matrix composites,were prepared in RF（radio frequency） thermal plasma. Mechanical crushed SiO₂ powders and spray granulated Al₂O₃ powder were used as raw materials. Optical microscope,XRD and TEM were used to characterize both the staring and plasma treated powders.The results show that highly spherical powders could be obtained by using RF thermal plasma. The diameters of the plasma treated particles become larger compared with that of the fine SiO₂ powder（mean diameter 2.9μm）,while the alumina particles become smaller and were densified simultaneously.The phase of the products changed during the plasma treatment processes.The plasma treated silica powders become amorphous and the spheroidized alumina powder’s phase become more complicated according to the experimental results.更多还原