(1. 太原理工大学 材料科学与工程学院，太原 030024；
2. 中国电子科技集团公司 第十二研究所，北京 100016)
摘 要: 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和1200 ℃，并分别保温脱碳0、20、40和60 min。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中的。微波加热场中固相脱碳反应的表观活化能为109.76 kJ/mol；常规加热场中固相脱碳反应的表观活化能为169.65 kJ/mol。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。
关键字: 高碳铬铁粉；固相脱碳；微波加热场；常规加热场；动力学
（1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2. 12th Research Institute, China Electronics Technology Group Company, Beijing 100016, China）
Abstract: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 were studied. Microwave oven and muffle furnace respective were used to heat high-carbon ferrochrome powder containing calcium carbonate to 900, 1000, 1100 and 1200 ℃, preserve heat and keep decarburization for 0, 20, 40 and 60 min. The results show that with the rising of heating temperature and holding time, the decarburization rates in microwave heating field and conventional heating field increase, when the heating temperature and holding time are the same, the decarburization rate in microwave heating field is significantly higher than that in conventional heating field. The apparent activation energy of solid phase decarburization reaction in microwave field is 109.76 kJ/mol; the apparent activation energy of solid phase decarburization reaction in conventional heating field is 169.65 kJ/mol. 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.
Key words: high-carbon ferrochrome powder; solid phase decarburization; microwave heating field; conventional heating field; kinetics
