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首页> 外文期刊>Metallurgia Italiana >NEW DEVELOPMENTS IN GASEOUS FERRITIC NITROCARBURISING BY USING HYDROCARBON GASES
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NEW DEVELOPMENTS IN GASEOUS FERRITIC NITROCARBURISING BY USING HYDROCARBON GASES

机译：油气气态对铁素体渗碳的新进展

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摘要

Industrial gaseous ferritic nitrocarburising processes, or shortly named ,,fnc", use mainly carbon dioxide or endothermic gas as the carbon providing gas in addition to ammonia gas. Both processes have positive and negative aspects and produce somewhat different layer structures. The carbon dioxide fnc process depicts a faster layer growth yielding a thicker and more porous nitride layer, whereas the endothermic fnc process produces a nitride layer with higher carbon content and a larger proportion of the epsilon-nitride phase. A newer variant of a fnc process uses hydrocarbons, and preferably propane or natural gas, as carbon providing gas replacing partly or totally carbon dioxide gas. This newer process uses different single or double step cycles combining the advantages of the enhanced nitrogen transfer as created by the carbon dioxide variant with the increased carbon transfer rate of the endothermic gas. This results in faster layer growth producing nitride layers with higher carbon content and a larger proportion of the epsilon-phase. This is advantageous with respect to wear resistance of the nitrocarburised components. In addition, it improves furnace productivity.
机译：工业气态铁素体氮碳共渗工艺（或简称为“ fnc”）除使用氨气外，还主要使用二氧化碳或吸热气体作为供碳气体。这两种工艺都具有正负两个方面，并产生一些不同的层结构。该工艺描述了更快的层生长，从而产生了更厚且多孔的氮化物层，而吸热fnc工艺则生成了具有更高碳含量和较大比例的ε-氮化物相的氮化物层。这种较新的方法使用不同的单步或双步循环，结合了二氧化碳变体产生的氮转移增强和碳转移率提高的优点，因此最好使用丙烷或天然气作为部分或全部替代二氧化碳的碳供气。吸热气体，这会导致更快的层生长，从而产生更高的碳化物氮化层bon含量和更大比例的ε相。就氮碳共渗成分的耐磨性而言，这是有利的。另外，它提高了炉子的生产率。

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