Sandvik Intellectual Property Ab

Peter Matsson

Tommy Larsson

Jan Engqvist

Erik Lindahl

Dirk Stiens

Sakari Ruppi

Hindrik Engstrom

Oscar Alm

Jonas Lauridsen

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 &#x3bc;m, including one or more layers having a wear resistant layer of &#x3b1;-AlOof a thickness of 1 to 45 &#x3bc;m deposited by chemical vapour deposition (CVD). The &#x3b1;-AlOlayer 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 &#x3b1;-AlOgrain 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 &#x3b1;-AlOgrains undergo a directional change into a direction that is essentially perpendicular, 90&#xb1;45 degrees, to the grain boundaries in the first thickness portion.

Alumina coated cutting tool

Growing community of inventors

Krylbo, Sweden

Peter Matsson