Coated cutting insert

US5071696A · kind A · utility

Assignee

• SANDVIK AB · SE

Inventors

• Christopher G. Chatfield · Stockholm, SE
• Jan N. Lindstrom · Knivsta, SE
• Mats Sjostrand · Sollentuna, SE
• Ingrid K. M. Collin · Stuvsta-Snättringe, SE

Key dates

• Filing date: Jun 15, 1990
• Grant date: Dec 10, 1991
• Expiry date: Jun 15, 2010

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/30
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The present invention relates to a body coated with at least one double layer Al.sub.2 O.sub.3 -TiC. Because the Al.sub.2 O.sub.3 -layer in contact with the TiC-layer consists of kappa-Al.sub.2 O.sub.3 or theta-Al.sub.2 O.sub.3 an improved adherence has been obtained. A further improvement of the properties is obtained if the body after the coating is heat treated for 0.3-10 hours at 900.degree.-1100.degree. C. in protecting gas atmosphere at which initially nucleated kappa- or theta-Al.sub.2 O.sub.3 is transformed to fine grained alpha-Al.sub.2 O.sub.3.