Hard metal or cermet body and method for producing the same

US7544410B2 · kind B2 · utility

Assignee

• Kennametal Widia Produktions GmbH & Co.KG · DE

Inventors

• Walter Lengauer · Leobendorf, AT
• Vera Ucakar · Wien, AT
• Klaus Dreyer · Essen, DE
• Dieter Kassel · Ronnenberg, DE
• Hans Werner Daub

Key dates

• Filing date: May 14, 2004
• Grant date: Jun 9, 2009
• Expiry date: Aug 25, 2025

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/265
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A hard metal or cermet body has a 2 to 100 μm thick first layer having a binder metal proportion of 2 to 25 mass % and up to 25 volume % of a nitride or carbonitride of one or more metals of Group IVa of the periodic system or up to 10 volume % of a carbide or carbonitride of V, Nb, Ta or Cr, balance WC, whereby the amount of nitride, carbonitride or carbide of the afore-mentioned metals amounts to at least 0.01 volume %. Under the first layer is a 2 to 40 μm thick second layer with an enhanced nitrogen proportion relative to the first layer, is disposed. Thereunder is a transition zone with a thickness of 2 to 100 μm in which the composition gradually changes to a homogeneous composition in the inner core of the hard metal or cermet body.