Gaseous Ferritic Nitro Carburising

About Gaseous Ferritic Nitro Carburising

Gaseous ferritic nitrocarburizing is alsoknown as controlled nitrocarburizing, soft nitriding, and vacuumnitrocarburizing or by the tradenames "UltraOx", ^[18] "Nitrotec","Nitemper", "Deganit", "Triniding","Corr-I-Dur", "Nitroc", "Nitreg-C", ^[19] "Nitrowear",and "Nitroneg". ^[3] [20] Theprocess works to achieve the same result as the salt bath process, exceptgaseous mixtures are used to diffuse the nitrogen and carbon into theworkpiece. ^[21]

The parts are first cleaned, usually witha vapor degreasing process,and then nitrocarburized around 570 C (1,058 F), with aprocessing time that ranges from one to four hours. The actual gas mixtures areproprietary, but they usually contain ammonia and an endothermic gas. ^[21]

In comparison to a standard nitridingprocess, ferritic nitrocarburizing or FNC in a vacuum furnace takes less timeto achieve case depth requirements - mainly in part due to the addition ofcarbon to achieve faster diffusion. ^[22]