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Plasma nitrocarburizing of austenitic stainless steel at 420 °C is typically applied to improve the surface hardness and wear resistance without impairing the corrosion resistance of the material. Recently, based on the active screen technology a novel plasma assisted approach has been developed substituting the usually used steel active screen by carbon-fibre reinforced carbon. This new concept avoids the use of carbon containing feed gases and provides highly reactive process gases consisting predominantly of unsaturated hydrocarbons and CN-radicals. The feasibility of this novel approach has been proven by spectroscopic and metallurgical studies in smaller laboratory set-ups but also in industrial scale systems. The present contribution compiles recent achievements in active screen plasma nitrocarburizing of AISI 316L and related materials using a carbon active screen under variations of bias power and process gas composition. The results are compared to plasma nitrocarburizing treatments using an active screen made of steel.

Plasma Nitrocarburizing of AISI 316L Austenitic Stainless Steel Applying a Carbon Active Screen: Status and Perspectives *