在783 ~843 K温度范围和不同保温时间(30 ~240 min)对45钢进行了离子氮氧共渗和离子渗氮表面改性处理,对比研究了两种处理方法的动力学.离子氮氧共渗是在离子渗氮的基础上添加流量为0.2 L/min的空气实现的.利用光学显微镜和X射线衍射仪对化合物层显微组织、厚度及物相组成进行了测试和分析.结果表明,添加适量空气可显著促进活性氮原子在基体内的扩散,离子氮氧共渗的扩散系数比普通离子渗氮显著提高,扩散激活能从227.25 kJ/mol降低到138.57 kJ/mol,从而可达到降低温度或缩短保温时间的效果.同时,计算得到了45钢在783 ~ 843 K温度范围内离子氮氧共渗时化合物层厚度与温度T(K)和保温时间t(s)的动力学关系式.
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