本文用转盘法在氩气保护下测得在温度为1550—1680℃间碳在液体铁中之扩散系数D=4.76exp(-38000/RT).实验证明,在脱氧完全与不脱氧的情况下,固体碳与液体铁反应均处于扩散动力学区域.在前一种情况下,反应的限制性环节为碳的扩散.在后一种情况下,总的反应由碳的溶解与碳-氧反应两平行过程组成,其限制性环节为碳的扩散及氧的扩散.
The diffusion coefficient of carbon in liquid iron has been determined byrotating disk method in the temperature range of 1550--1680℃ under argonatmosphere, the temperature dependence of diffusion coefficient being D=4.76 exp(-38000/RT). It was shown that in the case of either complete deoxidation orwithout any deoxidation, the reaction between solid carbon and liquid iron usu-ally lies in the region of diffusion kinetics. In the former case, the diffusion ofcarbon is the rate controlling factor of the reaction. While in the latter case, theoverall reaction consists of two parallel processes-the solution of carbon andthe reaction of solid carbon with the oxygen in liquid iron. The reaction rate isthen controlled by the diffusion of both carbon and oxygen.
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