Minnesota Mining and Manufacturing Company

Other

Vernon M Wald

Robert S Kirk

David E Broberg

Richard A Masson

Jerald A Scherger

Fredrick D Brown

Ahmet Celikkaya

An improved abrasive grain comprising the sintered product of a porous non-sintered particle having a coating of inorganic material thereon is provided. A preferred method of making such abrasive grains comprises coating the porous base particles with inorganic particles. The preferred step of coating comprises a step of mixing the base particles with a suspension containing the inorganic particles in a carrier fluid. The porous base particles having the coating of inorganic particles thereon are sintered, to generate the ceramic abrasive grain product. The abrasive grains may be incorporated, to advantage, in a variety of abrasive products including for example bonded abrasives, nonwoven abrasive products and coated abrasive products.

Abrasive grain, method of making same and abrasive products

Sinter ceramic abrasive grains having increased surface area and a method of making the same are provided. The abrasive grains are incorporated into improved 'shelling-resistant' abrasive articles such as coated abrasives, grinding wheels and non-woven abrasives. The ceramic abrasive grains are made by providing first particles comprising alpha-alumina precursor, introducing fine parpticles which can be sintered directly to the surface of the first particles upon sintering of the same, and heating the mixture of particles under sintering conditions to cause autogenous bonding of the fine particles of the surface of each of the first particles.

Shelling-resistant abrasive grain, a method of making the same, and

A coated abrasive article comprised of a blend of premium abrasive grains and nonabrasive diluent grains adhered to a backing material by a resinous binder. The article has an unexpected abrading efficiency, performing equal to, or superior to, a coated abrasive article containing only premium abrasive grains.

Coated abrasive products employing nonabrasive diluent grains

Sintered ceramic abrasive grains having increased surface area and a method of making the same are provided. The abrasive grains are incorporated into improved 'shelling-resistant' abrasive articles such as coated abrasives, grinding wheels and non-woven abrasives. The ceramic abrasive grains are made by providing first particles comprising alpha-alumina precursor, introducing fine particles which can be sintered directly to the surface of the first particles upon sintering of the same, and heating the mixture of particles under sintering conditions to cause autogenous bonding of the fine particles to the surface of each of the first particles.

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Saint Paul, MN, United States of America

Vernon M Wald