Patent ID: 9481819
Filing Date: 2016-11-01
CPC Classification: C04B,C09K

Claim Text:
1. A method of manufacturing an alumina-based abrasive grain, comprising: (a) preparing boehmite powder and activated alumina powder as starting materials; (b) forming a sol by wet-blending the boehmite powder, the activated alumina powder, a solvent and a deflocculant; (c) heating the sol at a first temperature which is higher than a room temperature and lower than a boiling point of the solvent and stirring the sol so as not to generate a precipitate; (d) forming a gel by heating the sol at a second temperature higher than the first temperature at which a viscosity of the sol is increased and the sol becomes a paste; (e) blending the gel with an organic solvent and performing wet crushing on the resulting mixture; (f) preparing a powder by drying the wet-crushed gel; (g) blending a binder and a solvent with the dried product, which is the powder, and molding the resulting mixture; (h) calcining the molded product; (i) performing dry crushing on the calcined product; and (j) sintering the dry-crushed product to transform activated alumina and boehmite contained therein to an α-Al