Coated cemented carbide body and method for use

US6720095B2 · kind B2 · utility

Assignee

• SANDVIK AB · SE

Inventors

• Sakari Ruppi · Fagersta, SE
• Anna Sandberg · Sala, SE
• Edward Laitila · Fagersta, SE

Key dates

• Filing date: Dec 20, 2002
• Grant date: Apr 13, 2004
• Expiry date: Dec 20, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/24926
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A coated sintered cemented carbide body includes a cemented carbide body, a first layer adjacent the cemented carbide body, the first layer including Ti(C,N) and having a thickness of from about 3 to about 20 &mgr;m, an alumina layer adjacent said first layer, the alumina layer including &agr;-Al2O3 or &kgr;-Al2O3 and having a thickness of from about 1 to about 15 &mgr;m, and a further layer adjacent the aluminum layer of a carbide, carbonitride or carboxynitride of one or more of Ti, Zr and Hf, the further layer having a thickness of from about 1 to 15 &mgr;m. A friction-reducing layer, including one or more of &ggr;-Al2O3, &kgr;-Al2O3 and nanocrystalline Ti(C,N) and having a thickness of from about 1 to about 5 &mgr;m, can be adjacent to the further layer. A method to cut steel with a sintered cemented carbide body where the alumina is &agr;-Al2O3 and a method to cut cast iron with a sintered cemented carbide body where the alumina is &agr;-Al2O3.