| abstract |
patent summary: "eutectic zirconia alumina-based abrasive grains". The present invention relates to heat treated zirconia alumina abrasive grains. abrasive grains based on al2o3 and zro2 melted in an electric arc furnace having a weight content of al2o3 between 52% and 62% by weight, zro2 + hfo2 between 35% and 45% by weight, with at least 6% by weight. weight, based on the total weight content of zro2 that is present in the high temperature tetragonal and / or cubic modifications of zro2, which are themselves 0.2 to 0.7 wt%, expressed as sodium2, carbon between 0, 03% to 0.5% by weight, additives between 0.5% and 10% by weight, and raw material impurities of less than 3% by weight are heat treated in the air at 350 ° C to 700 ° C. 1 to 6 hours using a rotary kiln. |