Glow discharge treatment of Inconel 625 for glass fibreizing spinner discs

Fibreizing spinner discs work in absolutely extreme conditions. They are exposed to the influences of high temperatures, oxidation at elevated temperatures, combustion gases, and liquid glass. The spinner discs usually used are made from Inconel 625 alloys. Liquid glass affects the chemical composition of the Inconel surface zone, decreasing the chromium content. This causes corrosion phenomena. The recent studies concerning the application of CrN layers to protect the spinner disc against the external environment are presented. It has been shown that CrN layers improve the lifetime of the spinner disc. Produced CrN layers have diffusion character, hardness ∼1700 HV 0.05, and high wear and corrosion resistance.