Silicon nitride having a high tensile strength

US5571760A · kind A · utility

Assignee

• Saint-Gobain/Norton Industrial Ceramics Corporation · US

Inventors

• Vimal K. Pujari · Corning, US
• Dennis M. Tracey · Medfield, US
• Michael Foley · Savanuru, IN
• Norman I. Paille, Jr. · Oxford, US
• Paul J. Pelletier · Sutton, US
• Lenny C. Sales · Carol Stream, US
• Craig A. Willkens · Sterling, US
• Russell L. Yeckley · Latrobe, US

Key dates

• Filing date: Oct 18, 1994
• Grant date: Nov 5, 1996
• Expiry date: Oct 18, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B41/0072
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A silicon nitride ceramic comprising: PA1 a) inclusions no greater than 25 microns in length, PA1 b) agglomerates no greater than 20 microns in diameter, and PA1 c) a surface finish of less than about 8 microinches, said ceramic having a four-point flexural strength of at least about 900 MPa.