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5. Nitriding and nitrocarburizing under reduced pressure
This process is similar to gas nitriding in a vacuum purge furnace, comparable to the furnaces used for tempering steels after vacuum quenching. The nitriding medium is a gaseous mixture under reduced pressure (100 to 400 hPa). The compounds used are ammonia-based, with possible additions of methane (nitrocarburizing) and oxygen (pure or in the form of oxidized varieties, N 2 O), whose role seems paramount in controlling the combination layer . The reduction in pressure increases the mean free path and thus the stability of the gaseous molecules introduced, as well as the rate of species turnover. This process is kinetically efficient and enables...
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Nitriding and nitrocarburizing under reduced pressure
High-temperature nitriding of stainless steels
Bibliography
Standards and norms
French Standards Association (AFNOR)
PSA
- Nitruration - 315-2240 - 02.85
- Nitruration des aciers - 02-60-206 - 01.93
- Spécification technique pour la nitruration et les nitrocarburations des dentures d'engrenages - DN1 - 12.88
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