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实验在MoSi2电阻炉内用饱和浓度法测试了Fe-C-N体系氮的浓度和活度,并根据含化合物的金属熔体结构的共存理论模型,推导了Fe-C-N金属熔体作用浓度计算模型。实验测得1 485℃碳饱和的Fe-C-N熔体中在氮分压0.1 MPa时氮的溶解度为0.006 5%,并且计算的作用浓度与相应的实测活度相符合,从而证明所得模型可以反映Fe-C-N金属熔体的结构本质,由模型得出金属熔体高碳含量有利于脱氮。
The concentration and activity of nitrogen in the Fe-C-N system were tested by the saturation concentration method in the MoSi2 resistance furnace. Based on the coexistence theoretical model of the metal melt containing the compound, the calculation model of the action concentration of the Fe-C-N metal melt was deduced. The experimental results show that the solubility of nitrogen is 0.006 5% when the partial pressure of nitrogen is 0.1 MPa in 1 485 ℃ carbon-saturated Fe-CN melt, and the calculated concentration is consistent with the corresponding measured activity, which proves that the obtained model can reflect Fe-CN metal melt structure of the nature of the metal melt obtained from the model of high carbon content is conducive to denitrification.