关于锰球氮化的动力学模型及生产工艺探索
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摘要
建立了锰球氮化的动力学模型,采用管式炉热重法对单个锰球进行了氮化,试验结果和模型能很好的吻合;此外还利用井式炉对氮化锰球的生产进行了初步探索,对井式炉氮化过程中炉料的温度进行了测量。结果表明,锰球氮化模型在实际生产中的应用关键在于氮气在锰球内部的扩散系数、局部化学反应速率常数、锰球半径等参数的确定;在井式炉生产过程中,由于锰和氮气之间的反应为剧烈的放热反应,反应放出的热量积聚,引起温度升高,可能产生烧结现象。
A dynamic model of the nitriding manganese pellets had been established in this paper. Each manganese pellet had been nitrided separately by tube furnace thermogravimetry. The experimental result coincided with the model. In addition,manganese nitride pellets were preliminarily produced by pit furnace. The furnace temperature was measured during the nitriding process. The result indicated that,on one hand,the application of the model of the nitriding manganese pellets was determined by parameters including diffusion coefficient of nitrogen inside the pellets,partial chemical reaction rate constant,radius of the pellets,and among others. On the other hand,during the pit furnace production,as manganese and nitrogen are drastic exothermic reaction,the released heat accumulated and thus the increased temperature might lead to sintering phenomenon.
A dynamic model of the nitriding manganese pellets had been established in this paper. Each manganese pellet had been nitrided separately by tube furnace thermogravimetry. The experimental result coincided with the model. In addition,manganese nitride pellets were preliminarily produced by pit furnace. The furnace temperature was measured during the nitriding process. The result indicated that,on one hand,the application of the model of the nitriding manganese pellets was determined by parameters including diffusion coefficient of nitrogen inside the pellets,partial chemical reaction rate constant,radius of the pellets,and among others. On the other hand,during the pit furnace production,as manganese and nitrogen are drastic exothermic reaction,the released heat accumulated and thus the increased temperature might lead to sintering phenomenon.
引文
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[2]刘勇,储少军,朱翔鹰,等.电解锰粉常压氮化过程的非催化气固反应模型[C]//第22届全国铁合金学术研讨会论文集,2013.
[3]贾耀卿.常用金属材料手册(上)[M].北京:中国标准出版社,2006:48.
[4]刘勇,储少军,王国宁.关于氮化锰球生产工艺优化的技术方向[C]//第21届全国铁合金学术研讨会论文集,2012.
[5]梁英教,车荫昌.无机物热力学数据手册[M].沈阳:东北大学出版社,1993:230-234.
[2]刘勇,储少军,朱翔鹰,等.电解锰粉常压氮化过程的非催化气固反应模型[C]//第22届全国铁合金学术研讨会论文集,2013.
[3]贾耀卿.常用金属材料手册(上)[M].北京:中国标准出版社,2006:48.
[4]刘勇,储少军,王国宁.关于氮化锰球生产工艺优化的技术方向[C]//第21届全国铁合金学术研讨会论文集,2012.
[5]梁英教,车荫昌.无机物热力学数据手册[M].沈阳:东北大学出版社,1993:230-234.