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气体渗碳和气体碳氮共渗是汽车制造中应用最普遍的一种化学热处理方法。采用以吸热式气氛或吸热-放热式气氛为主的可控气氛,能显著地提高零件质量。但是,目前还有不少问题,如渗层中常出现某些缺陷、设备复杂、处理周期仍然较长等。为克服这些缺点,人们正在重新评价碳、氮、氧在渗层形成过程中所起的作用,试图修改过去的传统观点,并在此基础上着手研制新的气氛、钢材预处理方法及新的化学热处理工艺等。
Gas carburizing and gas carbonitriding are the most commonly used chemical heat treatments in automotive applications. Adopting a controlled atmosphere mainly with an endothermic atmosphere or an endothermic-exothermic atmosphere can significantly improve the quality of parts. However, there are still many problems, such as infiltrating often appear some defects, equipment complexity, the processing cycle is still longer and so on. In order to overcome these shortcomings, people are reevaluating the role played by carbon, nitrogen and oxygen in the formation of an infiltration layer, attempting to modify the traditional viewpoints of the past and on this basis to develop new atmospheres, steel pretreatment methods and new Chemical heat treatment process.