Shelling-resistant abrasive grain, a method of making the same, and abrasive products
AssigneeMinnesota Mining and Manufacturing Company
InventorsVernon M. Wald, Robert S. Kirk
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Abstract
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.
Claims6
A method of making ceramic abrasive grain characterized by having separated protuberant masses of inorganic material autogenously bonded to the surface thereof, said method comprising the steps of:
- (a) providing a mass of first particles comprising alpha-alumina precursor material each particle of which is sinterable to an alpha-alumina-based abrasive grain;
- (b) introducing into said mass second particles much finer than said first particles, said second particles being capable of autogenous bonding to the surface of said first particles upon sintering of said first particles;
- and
- (c) heating said particles under sintering conditions to sinter said first particles and cause autogenous bonding of said second particles to the surface of each of said first particles.
Dependencies are inferred from the claim text.