Oxidation Behavior of Multilayer Hard Coatings (TiCN/Al₂O₃/TiN) in Process of Recycling Coated Multicomponent Hardmetal Scrap.

The coating is one of the biggest problems in the recycling of coated multicomponent hardmetal scraps. The isothermal oxidation behavior of WC-Co multicomponent cemented carbide inserts with a TiCN/Al₂O₃/TiN hard coating in the recycling process was investigated. The oxidation rate slowed down as the protective coating blocked element diffusion.