Hard-metal or cermet body, especially for use as a cutting insert

US6110603A · kind A · utility

Assignee

• Widia GmbH · DE

Inventors

• Limin Chen · Dix Hills, US
• Walter Lengauer · Leobendorf, AT
• Hans Werner Daub
• Klaus Dreyer · Essen, DE
• Dieter Kassel · Ronnenberg, DE

Key dates

• Filing date: Jun 29, 1999
• Grant date: Aug 29, 2000
• Expiry date: Jun 29, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/12139
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A hard metal or cermet body, especially as a cutting insert, has a WC content in the hard phase making up at least 10% and at most 96% thereof and three layers or zones between the interior of the body and the surface formed by the heat treatment to which the sinterable body is subjected. In the outermost layer hard material with limited binder content can be formed underlain by an intermediate layer of a substantially pure WC--Co composition, the innermost layer having a tungsten content falling to the value in the body interior and a binder phase and Group IVa and Group Va metal which increased progressively to the levels in the body interior.