Melted alumina-zirconia ceramic grains, abrasive tools and refractory parts produced from said grains
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United States of America Patent
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Mar 14, 2006
Grant Date -
Mar 4, 2004
app pub date -
Jun 10, 2003
filing date -
Dec 9, 1998
priority date (Note) -
Expired
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Abstract
A process for producing fused alumina-zirconia grits includes mixing raw materials suitable to produce grits with the following chemical composition, in % by weight: ZrO2+HfO2: 10-60%, Al2O3: 38-90%, SiO2: <0.8%, and Impurities: <1.2%. The process also includes adding carbon and aluminum metal to the mixture of raw materials to obtain a charged batch containing, in % by weight,: Carbon: 0.4-1% Aluminum metal: 0.5-2.5%. The process further includes melting the charged batch in an electric arc furnace with a voltage of 175-205 V and a delivered specific electrical energy of 2.5 to 4 kWh per kg of charge.
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