Abrasive grits formed of ceramic containing oxides of aluminum and rare earth metal, method of making and products made therewith
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United States of America Patent
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Nov 21, 1989
Issued Date -
N/A
app pub date -
May 2, 1988
filing date -
May 27, 1987
priority date (Note) -
Expired
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Abstract
Ceramic abrasive grits comprising alpha alumina and at least about 0.5 percent by weight rare earth metal oxide are prepared by combining alumina hydrate and rare earth metal oxide or its precursors to produce a blend, drying the blend to produce a dried solid, crushing the dried solid to produce grits, calcining the dried grits to substantially remove bound volatile materials, and firing the grits to produce a ceramic material. The rare earth metal is selected from the group consisting of praseodymium, samarium, ytterbium, neodymium, lanthanum, gadolinium, cerium, dysprosium, erbium, and mixtures of one or more rare earth metal.
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