离子渗氮中的反应扩散与渗氮速度

根据夏立芳和Jost的反应扩散模型 ,选择典型材料 ,通过改变渗氮饱和条件获得不同表面化合物相组分 ,计算出氮原子在γ′相中的扩散系数Dγ′.结果表明 ,离子渗氮时 ,Dγ′ 约为α相中的 1/ 10 ,是气体渗氮时的 2 5倍以上 ,在实验上验证了理论分析 .对INTC的快渗机制作出更明确的解释 ,并指出控制表面饱和条件 ,使表面形成有利的反应化合物相组分或结构组态是实现钢的深层快渗的有效技术途径 .

Reaction diffusion and nitriding speed in ion nitriding

According to Xia Lifang and Jost' s model of reaction diffusion, typical materials were used and different surface compound compositions by changing the nitriding saturation condition were obtained. The diffusional coefficient of nitrogen in γ' phase was measured. The results showed that the Dγ' was about 1/10 that in a phase under ion - nitrding condition, and above 25 times that under gas - nitriding. These results demonstrated the theory deduced as above, and the mechanism of accelerating nitriding on INTC was explained explicitly by an experiment. It pointed out that forming a favorable compound composition or its structuralcomposition at the surface of steel was an effective technical way for the deep case accelerating nitriding.