Cemented carbide with binder phase enriched surface zone

US6913843B2 · kind B2 · utility

Assignee

• Seco Tools AB · SE

Inventors

• Jenni Zackrisson · Fagersta, SE
• Jan Qvick · Virsbo, SE

Key dates

• Filing date: May 17, 2004
• Grant date: Jul 5, 2005
• Expiry date: May 17, 2024

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/24942
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A cutting tool insert has a cemented carbide substrate and a coating. The cemented carbide substrate includes 73-93 wt % WC, 4-12 wt % binder phase, and cubic carbide phase with a binder phase enriched surface zone essentially free of cubic carbide phase. The cubic carbide phase includes elements from the groups IVB and VB, with the Ta content on a level corresponding to a technical impurity. Inserts according to the invention exhibit favorable edge strength and thermal shock resistance.