Alumina coated cutting tool

US10286453B2 · kind B2 · utility

Assignee

• Sandvik Intellectual Property AB · SE

Inventors

• Sakari Ruppi · Fagersta, SE
• Hindrik Engstrom · Söderbärke, SE
• Jonas LAURIDSEN · Västerås, SE
• Oscar ALM · Norberg, SE
• Peter Matsson · Avesta, SE
• Tommy Larsson · Ludvika, SE
• Erik Lindahl · Solna, SE
• Jan Engqvist · Uppsala, SE
• Dirk Stiens · Tübingen, DE

Key dates

• Filing date: Jan 29, 2015
• Grant date: May 14, 2019
• Expiry date: Jan 29, 2035

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B23B2228/08
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A coated cutting tool insert includes a substrate of cemented carbide, cermet, ceramics, steel or cubic boron nitride having deposited thereon a coating having a total thickness of 60 μm, including one or more layers having a wear resistant layer of α-Al2O3 of a thickness of 1 to 45 μm deposited by chemical vapour deposition (CVD). The α-Al2O3 layer includes at least two portions, a first thickness portion and a second thickness portion immediately on top of the first thickness portion. The first thickness portion has an essentially columnar α-Al2O3 grain structure, and at a transition from the first thickness portion to the second thickness portion the grain boundaries of at least 1 out of 25 neighboring grains of the α-Al2O3 grains undergo a directional change into a direction that is essentially perpendicular, 90±45 degrees, to the grain boundaries in the first thickness portion.