少了渗箱内壁与以45钢和20CrMnMo钢为例进行了直流电场下的固体软氮化. 软氮化试样为直流电场负 极, 电场正极为板状, 平行于试样的欲软氮化面放置. 实验结果表明: 直流电场加速软氮化过程, 改善渗层硬度梯度分布; 直流电场的加热作用加速渗剂的化学反应, 提高N、C原子在试样中的扩 散速度; 与常规加热固体软氮化工艺相比, 效率提高. 分析认为: 直流电场使含N、C活性基团向 负极试样快速定向扩散, 使得负极试样周围N、C浓度较常规粉末渗中的单纯热扩散提高, 相对减 样品非工作面对N、C原子的吸收; 直流电场的物理作用强化渗剂间的化学反应, 从而增加活性N、C原子或含N、C活性基团的产率与活性.
Plate anode and specimen as cathode parallels with each other, and both are sealed with agents in stainless box. The influence of direct current field (DCF) on nitrocarburizing has been investigated by applying DCF between the anode and the specimen as cathode during the soaking. The test results indicate that DCF can enhance nitrocarburizing, modifies hardness profile along the case depth and save energy. DCF has the heating effect to agents and specimen, which enhances chemical reactions in the agent, accelerates the diffusion of nitrogen and carbon atoms in the specimen. It is proposed that DCF make the concentrations of nitrogen and carbon at and around the specimen as cathode much higher than in any other position compared with the conventional powder-pack nitrocarburizing (CPN) process by forcing nitrogen-/carbon-containing species diffuse toward the cathode, which relatively decreases nitrogen/carbon absorption by inner wall surface of the pack box and the non-working surface of the specimen. DCF’s physical effect of enhancing chemical reaction in the agent increases the activity and productivity of nitrogen-/carbon-containing species, which overcomes the shortcoming that CPN can not produce enough boron-containing species by conventional way of heating.
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