Effect of Plasma Spheroidization Process on the Microstructure and Crystallographic Phases of Silica, Alumina and Nickel Particles  

作　　者：胡鹏 闫世凯 袁方利 白柳杨 李晋林 陈运法 

机构地区：[1]Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100080,China Graduate University of Chinese Academy of Sciences, Beijing 100049,China [2]Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100080,China

出　　处：《Plasma Science and Technology》2007年第5期611-615,共5页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China (No.50574083)

摘　　要：During the plasma spheroidization process powders undergo different changes in their microstructures and crystal phases. In this paper, simple calculation of heat transfer between the plasma and a suspended particle was performed based on three hypotheses for the purpose of guiding experiments. Experimental investigation of the crystal phases and microstructural changes during the plasma processing was made using silica, alumina and nickel powders as starting materials. It has been revealed from the experimental results that these materials undergo different changes in crystal phases and microstructures, and these changes are essentially determined by the structures, properties and aggregate states of the starting materials.During the plasma spheroidization process powders undergo different changes in their microstructures and crystal phases. In this paper, simple calculation of heat transfer between the plasma and a suspended particle was performed based on three hypotheses for the purpose of guiding experiments. Experimental investigation of the crystal phases and microstructural changes during the plasma processing was made using silica, alumina and nickel powders as starting materials. It has been revealed from the experimental results that these materials undergo different changes in crystal phases and microstructures, and these changes are essentially determined by the structures, properties and aggregate states of the starting materials.

关 键 词：radio frequency plasma SPHEROIDIZATION MICROSTRUCTURE crystal phase silica alumina NICKEL 

分 类 号：O539[理学—等离子体物理]