【作者】 李晓光； 陈津； 郝赳赳； 韩培德； 刘金营；

【Author】 LI Xiao-guang~(1)),CHEN Jin~(1)) HAO Jiu-jiu~(1)) HAN Pei-de~(1)) LIU Jin-ying~(2)) 5)College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,china; 6)12th Research Institute of China Electronics Technology Group Company,Beijing 100016,China

【机构】 太原理工大学材料科学与工程学院； 中国电子科技集团公司第十二研究所；

【摘要】 微波加热和常规加热的加热机理不同,在一定程度上影响着化学反应的动力学条件和活化能。本文以内配碳酸钙高碳铬铁粉为研究对象,对不同加热方式下固相脱碳的动力学行为和活化能进行了对比研究。内配碳酸钙高碳铬铁粉在微波加热场和常规加热场分别加热到900℃、1000℃、1100℃、1200℃并分别保温脱碳0、20、40、60 min。试验结果表明,随着脱碳温度的升高和脱碳保温时间的延长,微波加热场和常规加热场中的脱碳物料的脱碳率都随之提高,在相同的脱碳温度和脱碳保温时间下,微波加热场中脱碳物料的脱碳率远高于常规加热场。微波加热场中固相脱碳反应的表观活化能为61.38kJ·mol^-1;常规加热场中固相脱碳反应的表观活化能为118.19kJ·mol^-1。表明微波加热场能改善固相脱碳的动力学条件,提高内配碳酸钙高碳铬铁粉固相脱碳反应速率,促进碳在高碳铬铁粉中的扩散,降低脱碳反应的活化能。更多还原

【Abstract】 The heating mechanism of microwave heating is different from that of conventional heating,and it affects the kinetics condition and activation energy of chemical reaction to some extent.Taking the high-carbon ferrochrome powder containing calcium carbonate as the research object,the kinetics behavior and activation energy of solid phase decarburization under different heating methods are compared in this paper.Use microwave oven and muffle furnace respectively to heat high-carbon ferrochrome powder containing calcium carbonate to 900℃,1000℃,1100℃,1200℃,preserve heat and keep decarburization for 0 min, 20min,40min and 60min.The test results show that with the rising of heating temperature and holding time,the decarburization percentage of microwave heating field and conventional heating field all increase,when the heating temperature and holding time are same,the decarburization percentage of microwave heating field is significantly higher than that of conventional heating field.The apparent activation energy of solid phase decarburization reaction in microwave field is 61.38 kJ ? mol^-1;the apparent activation energy of solid phase decarburization reaction in conventional heating field is 118.19 kJ·mol^-1.Microwave heating field can improve the kinetics condition of solid phase decarburization,increase the reaction rate of solid phase decarburization of high-carbon ferrochrome powder containing calcium carbonate,promote the diffusion of carbon in high-carbon ferrochrome powder,and reduce the activation energy of decarburization reaction.更多还原