Ceramic cutting tool material with improved toughness

US5110770A · kind A · utility

Assignee

• SANDVIK AB · SE

Inventors

• Nils G. L. Brandt
• Anders Thelin · Sundbyberg, SE

Key dates

• Filing date: Jun 28, 1991
• Grant date: May 5, 1992
• Expiry date: Jun 28, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B35/80
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

This invention relates to a cutting tool material with improved toughness behavior using alumina or silicon nitride as the matrix material. The improved toughness is achieved by the addition of whiskers and optionally zirconia in a monoclinic or tetragonal phase, to the matrix. The whiskers are disc-shaped with a thickness of 0.5-8 .mu.m and an equivalent diameter (hypothetical diameter of a circle with the same area as the disc) of about 5-50 .mu.m.