Zirconium corundum abrasive grains with a high SiO2 content

摘要

The present invention relates to zirconium corundum abrasive grains based on Al2O3 and ZrO2 melted in an electric arc furnace with a content of - Al2O3 between 52 and 62% by weight, - ZrO2(+ HfO2) between 35.0 and 45.0% by weight, with a total of at least 80 % by weight of the ZrO2, based on the total content of ZrO2, present in the tetragonal and/or cubic high-temperature modification,- Si compounds of more than 0.8% by weight, expressed as SiO2,- carbon between 0.03 and 0.5% by weight %,- additives between 0.5 and 10% by weight and- raw material-related impurities of less than 3% by weight, the raw material basis for the abrasive grains comprising aluminum oxide, baddeleyite and zircon sand.