铁碳合金薄带气-固反应脱碳动力学分析

Decarburization dynamics analysis of gas-solid reaction of Fe-C alloy ribbon

为了研究铁碳合金薄带固相脱碳反应的动力学。试验以Ar-H2-H2O为脱碳气氛,在可控气氛管式炉内对Fe-C合金薄带进行脱碳。把铁碳合金薄带放入加热场中加热到1 020、1 080和1 140℃,并分别保温脱碳0、10、30、50、60、70、80和90min。结果表明,碳向反应界面的扩散是脱碳反应的限制性环节,脱碳温度的升高和脱碳保温时间的延长均有利于提高脱碳量,而且提高反应温度有助于提高脱碳反应速率。铁碳合金薄带固态脱碳反应近似为一级反应,脱碳反应表观活化能为144.9kJ/mol。

The solid phase decarburization reaction kinetics of Fe-C alloy ribbon was studied.The Fe-C alloy ribbon was decarburized in the tube furnace taking Ar-H2-H2 O as the decarburizing atmosphere.The Fe-C alloy ribbon was put in heating field,and heated to 1 020,1 080 and 1 140℃,then insulated for 0,10,30,50,60,70,80 and 90minutes to decarburize,respectively.The results showed that the diffusion of carbon to the reaction interface was the restricted link for the decarburization reaction.And with the increase of the decarburization temperature and holding time,the content of decarburization was improved,and the decarburization rate was also improved due to the increase of the reaction temperature.The results illustrated that the solid phase decarburization reaction can be approximate to first-order reaction and the apparent activation energy of decarburization reaction was 144.9kJ/mol.