射频热等离子体球化氧化铝粉末的实验研究  

Experimental Study of RF Thermal Plasma Spheroidization of Alumina Powder

作　　者：朱海龙[1] 叶高英[1] 程昌明[1] 杨发展[1] 童洪辉[1] 

机构地区：[1]核工业西南物理研究院,四川成都610041

出　　处：《稀有金属材料与工程》2014年第11期2810-2813,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(11205050)

摘　　要：采用射频热等离子体作为高温热源对氧化铝粉末进行球化处理实验研究。结果表明:当送粉量为35 g/min时,球化后的氧化铝粉末表面极光滑,而且颗粒与颗粒之间没有粘连,分散性好,球化率几乎达到了100%。进一步提高送粉量,球化率有所降低。采用X射线衍射仪分析球化前后氧化铝粉末的相变。结果显示:前驱粉末为弱结晶的γ-Al2O3经射频热等离子体球化后变转为结晶度较好的α-Al2O3和θ-Al2O3。An experimental study was carried out for spheroidization of alumina powder using radio frequency （RF） thermal plasma. The results show that when the powder flow rate is 35 g/rain, the spheroidization rate is up to 100%, and the spheroidized alumina powder exhibits superior performance, such as smooth surface, no adhesion and good dispersion. If further increasing powder flow rate, the spheroidization rate will decrease. In addition, the phase transition of alumina powder was detected using X-ray diffraction. It is identified thatγ-Al2O3 is transformed into α-Al2O3 and θ-Al2O3after plasma spheroidization and the crystallinity is better than before.

关 键 词：射频热等离子体 氧化铝 球化 表征 

分 类 号：TQ133.1[化学工程—无机化工] O53[理学—等离子体物理]