Grinding beads and method of producing the same
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United States of America Patent
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Dec 13, 2011
Grant Date -
Feb 5, 2009
app pub date -
Jul 31, 2007
filing date -
Jul 31, 2007
priority date (Note) -
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Abstract
A ceramic consisting essentially of: about 51% to about 68% by weight ZrO.sub.2; about 20% to about 40% by weight Al.sub.2O.sub.3; about 9% to about 12% by weight CeO.sub.2; about 0.05% to about 0.2% by weight SiO.sub.2; about 0.01% to about 0.1% by weight MgO; about 0.1% to about 0.6% by weight MnO; and about 0.01% to about 0.8% by weight CaO.
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