CEMENTED CARBIDE WITH REFINED STRUCTURE

• Main Authors: NORGREN, SUSANNE, KUSOFFSKY, ALEXANDRA, ÅKESSON, LEIF
• Format: Patent
• Language: English; French; German
• Published: 08.10.2014
• Subjects: ALLOYS; BORING; CASTING; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; FERROUS OR NON-FERROUS ALLOYS; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; MACHINE TOOLS; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; PERFORMING OPERATIONS; POWDER METALLURGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; TURNING; WORKING METALLIC POWDER

The present invention relates to a coated cemented carbide milling insert for either wet or dry machining of cast iron such as nodular cast iron (NCI), grey cast iron (GCI), austempered ductile iron (ADI) and compacted graphite iron (CGI) where a high wear resistance and an excellent resistance against thermo cracks are required comprising: -a substrate comprising 5-7 wt-% Co, 140-250 ppm Ti+Ta and balance WC with a weight ratio Ti/Ta of 0.8-1.3 and -a PVD-layer consisting of Al x Ti 1-x N, with x 0.50-0.70 and with a thickness of 1-10 µm. The invention also relates to a method for making cutting tool inserts.