Abstract: A vitreous bonded abrasive article, more particularly a grinding wheel, having improved grinding performance is provided wherein the open pores of the abrasive article contain an impregnant which comprises at least one water insoluble, sulfur bearing organic substance having at least one carbon to sulfur bond, at least about 5% by weight sulfur and a melting point of at least about 30° C. said melting point being at least 10° C. below the decomposition temperature of the substance and selected from the group consisting of substituted and unsubstituted aliphatic, aromatic, cycloaliphatic, alkenyl, alkynyl, alkylaryl, arylalkyl and substituted heterocyclic sulfur bearing organic substances or a mixture of said substances grinding aid. The impregnant is free of a medium, other than the water insoluble, sulfur bearing substance, in which the substance or a mixture of such substances is dissolved or dispersed.

Abstract: A method is provided that produces grinding wheels which exhibit improved burn reduction or prevention, lower power consumption and increased penetration of metalworking fluid into the grinding zone in high metal removal rate grinding operations such as for example creep feed grinding.

Abstract: A vitreous bonded abrasive article such as a grinding wheel is provided comprising high density sol-gel alumina-based abrasive grains comprised of alpha alumina and a vitreous bond which binds together the abrasive grains. The grinding wheel of the invention exhibits enhanced G-ratio grinding performance over comparable wheels containing sol-gel alumina-based abrasive grain having a density less than 3.85 grams per cubic centimeter.

Abstract: There has been discovered the increased E-Modulus and grinding performance of vitreous bonded sol-gel abrasive grit abrasive articles, particularly abrasive grinding wheels, by the incorporation therein of inorganic, non-metallic bubbles. In a practice of the invention the abrasive article comprises a) an abrasive phase having sintered sol-gel alumina abrasive grits and second abrasive grits that are not of the sintered sol-gel type, b) a vitreous bond and c) essentially hollow, essentially spherical alumina particles having a softening temperature at least 50.degree. F. greater than the firing temperature of the vitreous bond.

Abstract: A method for making vitreous bonded abrasive articles, particularly grinding wheels, is provided that includes the step of blending sugar/starch particles into the other ingredients for making the wheel. The sugar/starch particles are intimate combinations of sugar and starch. Wheels of improved performance are obtained compared to similar wheels made by a comparable method not including the step of blending sugar/starch particles into the abrasive grain, vitreous bond material and other components used for making the wheel.