SHELLING-RESISTANT ABRASIVE GRAIN, METHOD OF MAKING SAME, AND ABRASIVE PRODUCTS

• Main Authors: WALD VERNON M, KIRK ROBERT S
• Format: Patent
• Language: English
• Published: 28.03.1990
• Subjects: ADHESIVES; ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS; CONCRETE; DYES; GRINDING; INORGANIC CHEMISTRY; LIME, MAGNESIA; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; PERFORMING OPERATIONS; POLISHES; POLISHING; REFRACTORIES; SLAG; TOOLS FOR GRINDING, BUFFING, OR SHARPENING; TRANSPORTING; TREATMENT OF NATURAL STONE

Sintered ceramic abrasive grains having increased surface area are incorporated into improved "shelling-resistant" grinding wheels. The grinding wheels comprise a vitreous bond and abrasive grains in which a portion of said abrasive grains are alumina based ceramic particles made by a sol-gel process. These alumina based 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.