Cemented carbide insert

US6616970B2 · kind B2 · utility

Assignee

• SANDVIK AB · SE

Inventors

• Anders Lenander · Tyresö, SE
• Mikael Lindholm · Kalmar, SE

Key dates

• Filing date: Nov 19, 2001
• Grant date: Sep 9, 2003
• Expiry date: Nov 19, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/30
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Methods of making a coated cemented carbide body include: forming a powder mixture having WC, 5-12 wt % Co, 3-11% cubic carbides of Ta and Ti with a ratio of Ta/Ti is 1.0-4.0; adding N in an amount of 0.6-2.0% of the weight of Ta and Ti; milling and spray-drying the mixture to form a powder; compacting and sintering the powder at a temperature of 1300-1500° C., in a controlled atmosphere of about 50 mbar followed by cooling, whereby a body having a binder phase enriched and essentially gamma-phase free surface zone of 5-50 &mgr;m in thickness is obtained; applying a pre-coating treatment to the body; and appling a hard, wear-resistant coating to the body.