Minnesota Mining and Manufacturing Company

Robert S Kirk

Vernon M Wald

Fireworks container

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

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

Robert S Kirk