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本文研究了一种新的渗硼方法——固一气渗硼法。在固体渗硼的基础上,通过活化剂的泛选和正交试验,研制出了适用于此渗硼法的颗粒渗硼剂。用此渗剂对45钢进行900℃、4小时固一气渗硼处理后,可在其表面形成96μm左右的硼化层(单相Fe_2B)。本文还对固一气渗硼过程的有关化学反应进行了热力学分析。根据硼化层厚度的“等效面积”的模型,分析了硼化层生长的动力学问题,导出了单相硼化层形成时Fick第二定律的分析解及硼化层生长的动力学因子所满足的方程。
In this paper, a new method of boronizing solid-in-air boronizing is studied. On the basis of solid boronizing, granulation boronizing agent suitable for this boronizing method was developed through the generalization and orthogonal experiment of activator. With this penetration agent, the 45 steel was infiltrated by solidified gas at 900 ℃ for 4 hours, and then a 96-μm boride layer (single-phase Fe 2 B) was formed on the surface of the steel. In this paper, the thermodynamic analysis of the chemical reaction of solid-gas-infiltration process was also carried out. According to the model of “equivalent area” of the thickness of the boride layer, the kinetics of the growth of the boride layer is analyzed, and the analytic solution of the second law of Fick in the formation of the single-phase boride layer and the kinetic factor of the growth of the boride layer are derived The equation satisfied.