Abrasive grains on basis of eutectic alumina zirconia
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United States of America Patent
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Dec 12, 2017
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May 12, 2016
app pub date -
Jun 13, 2014
filing date -
Jun 19, 2013
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Abstract
Heat treated alumina zirconia abrasive grains based on Al2O3 and ZrO2 may be fused in an electric arc furnace, and may have a weight content of: Al2O3 between 52% and 62% by weight; ZrO2 and HfO2 between 35% and 45% by weight, with at least 6% by weight based on the total weight content of ZrO2 being present in the tetragonal and/or cubic high temperature modifications of ZrO2; Si-compounds between 0.2% and 0.7% 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-based impurities of less than 3% by weight. The heat treated alumina zirconia abrasive grains may be heat treated in air between 350° C. and 700° C. for a time period of one to six hours using a rotary kiln.
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