Patent ID: 7648933
Filing Date: 2010-01-19
Classification: C03C,C09K

Abstract:
1. A composition with a Mohs hardness of at least 6.0, wherein said composition is comprised of at least 30 weight percent of spinel crystals, at least 10 weight percent of glass, and less than about 10 weight percent of ferrometasilicate, wherein said composition comprises at least 95 weight percent of particles with a particle size smaller than about 2.0 millimeters, wherein at least about 70 weight percent of said particles have a particle shape selected from the group consisting of blocky particle shape, pyramidal particle shape, and mixtures thereof, and wherein: (a) at least 20 weight percent of said spinel crystals are equiaxed spinel crystals, (b) the weight/weight ratio of said spinel crystals to said glass is at least 1.2/1, (c) said composition has a melting point in excess of 1300 degrees Celsius, (d) said composition has a density of from about 3.0 to 4.5 grams per cubic centimeter, and (e) said composition is comprised of from about 1 to about 20 weight percent of a calcium iron silicate.