Grãos de Al2O3-Er2O3 abrasivos de cerâmica, processo para produzir grãos abrasivos de cerâmica, artigos de esmerilhamento e grãos abrasivos revestidos

摘要

Al2O3-Er2O3 ceramic abrasive grains comprising a second phase consisting of aluminum oxides and erbium oxides in the form of reaction products surrounding a first phase and the first phase exclusive of the second phase and substantially consisting of alpha alumina only, the size of the crystal grain consisting of two phases being below 1 micron, which are obtained by a sol-gel process wherein erbium precursor is incorporated before sintering in an amount of 0.05 - 0.4 wt% in a form of Er2O3, which is suitable for lapping composition, grinding wheel, grinding disc and coated abrasive articles.