Treatment that combines plasma nitriding and PVD hardcoating
Abrasive and erosive wear, corrosive decomposition products, cavitation and adhesive interactions are wear mechanisms that are caused by additives in plastics and can result in premature failure of tooling. To counteract these tribological cost generators, Sulzer Metaplas GmbH, Bergisch-Gladbach, Germany, offers a duplex treatment that combines plasma nitriding and PVD hardcoating. Plasma nitriding is a classic surface heat treatment that increases surface hardness as the result of nitrogen diffusion upon subjecting the surface to a glow discharge plasma. The nitrided layer created by the plasma serves as a supporting surface for the subsequent PVD hardcoating.
The Metaplas hardcoatings are formed by physical deposition from the gas phase. The electronic bonding forces ensure outstanding bonding between the PVD coating and substrate. The classic PVD hardcoatings TiN, CrN, multilayer CrN, CrN-mod as well as the dry lubricant coating W-C:H have demonstrated their ability to provide protection against wear in the plastics and elastomer processing industries. The variety of materials available permits exact matching of the coating to the requirements of the application. The combination of plasma nitriding and PVD coating - the latter can be performed at temperatures of 180°C and higher - also permits treatment of heat treated steels and less hardenable hot work tool steels. The mechanical properties of the core material, e.g. toughness and insensitivity to cracking, remain unchanged in this process.
Oerlikon Metaplas GmbH
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