Granular silicon carbide abrasive grain coated with refractory material, method of making the same and articles made therewith

US4505720A · kind A · utility

Assignee

• Minnesota Mining and Manufacturing Company · US

Inventors

• Thomas Gabor · Maplewood, US
• David E. Broberg · Windom, US
• Gunther H. Dierssen · White Bear Lake, US
• Donley D. Rowenhorst · Maplewood, US

Key dates

• Filing date: Jun 29, 1983
• Grant date: Mar 19, 1985
• Expiry date: Jun 29, 2003

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K3/1436
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Improved granular abrasive material comprises silicon carbide particles at least partially coated with an integral, durable surface layer of a hard refractory material comprising metal nitride or carbide. Hard refractory materials which provide a useful coating include, for example, silicon nitride or carbide, titanium nitride or carbide, sialon, and others. The surface layer is preferably provided by chemical vapor deposition, most preferably utilizing a fluidized bed. The improved granular abrasive material is particularly useful in various abrasive products such as coated abrasive products, nonwoven abrasive products and abrasive grinding wheels.