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前言 传统的氮化工艺中广为应用的是气体氮化法。但从它问世以来,最大的缺点是生产周期太长,要达到0.5mm的层深,一般就需50～70小时,生产率低、能耗大、成本高。因此,人们一直在寻求加速氮化的方法,目前采用的各种物理催渗和化学催渗都带来了设备、催掺剂等费用的增加,使成本下降率相应减少。能否既不增添设备和催渗剂,又能进一步缩短氮化周期呢? 本文试图从改变氮化工艺本身入手,以化学动力学为手段,探索加速氮化、缩短周期的方法和机理,进行循环两段气体氮化的试验与研究。
Preface The traditional nitriding process is widely used in gas nitriding. However, since it came out, the biggest drawback is that the production cycle is too long. To reach a depth of 0.5 mm, it generally takes 50 to 70 hours, low productivity, high energy consumption and high cost. Therefore, people are always looking for ways to accelerate nitriding. At present, all kinds of physical and chemical catalysis bring the cost of equipment and catalyst, and the cost reduction rate is correspondingly reduced. Can not add equipment and permeability enhancer, but also to further shorten the cycle of nitriding it? This article attempts to start from the change of nitriding itself, the chemical kinetics as a means to explore the method of accelerating nitriding, shortening the cycle and mechanism of Experimental and Research on Nitriding of Two Circulating Gas.