(1. 太原理工大學(xué) 材料科學(xué)與工程學(xué)院，太原 030024；
2. 中國電子科技集團(tuán)公司 第十二研究所，北京 100016)
摘 要: 以內(nèi)配碳酸鈣高碳鉻鐵粉為研究對象，對不同加熱方式下固相脫碳的動力學(xué)行為和活化能進(jìn)行研究。內(nèi)配碳酸鈣高碳鉻鐵粉在微波加熱場和常規(guī)加熱場分別加熱到900、1000、1100和1200 ℃，并分別保溫脫碳0、20、40和60 min。結(jié)果表明，隨著脫碳溫度的升高和脫碳保溫時間的延長，微波加熱場和常規(guī)加熱場中的脫碳物料的脫碳率都提高，在相同的脫碳溫度和脫碳保溫時間下，微波加熱場中脫碳物料的脫碳率遠(yuǎn)高于常規(guī)加熱場中的。微波加熱場中固相脫碳反應(yīng)的表觀活化能為109.76 kJ/mol；常規(guī)加熱場中固相脫碳反應(yīng)的表觀活化能為169.65 kJ/mol。微波加熱場能改善固相脫碳的動力學(xué)條件，提高內(nèi)配碳酸鈣高碳鉻鐵粉固相脫碳反應(yīng)速率，促進(jìn)碳在高碳鉻鐵粉中的擴(kuò)散，降低脫碳反應(yīng)的活化能。
關(guān)鍵字: 高碳鉻鐵粉；固相脫碳；微波加熱場；常規(guī)加熱場；動力學(xué)
（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
