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US 5,489,318 AGranted
Abrasive grain comprising calcium oxide and/or strontium oxide
AssigneeMinnesota Mining and Manufacturing Company
InventorsDwight D. Erickson, William P. Wood
Life of this patent
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Abstract
Alumina-based abrasive grain comprising rare earth oxide and calcium oxide and/or strontium oxide, and a method of making the same. The abrasive grain is useful in abrasive articles, such as coated abrasives, three-dimensional, low density abrasives, and bonded abrasives.
Claims18
A ceramic abrasive grain comprising:
- (a) an alpha alumina matrix;
- and
- (b) one or more crystalline reaction products, each comprising aluminum oxide, a rare earth oxide selected from the group consisting of praseodymium oxide, samarium oxide, europium oxide, holmium oxide, lanthanum oxide, gadolinium oxide, dysprosium oxide, neodymium oxide, erbium oxide, and mixtures thereof, and at least 0.07 percent by weight, based on the total weight of said abrasive grain, of calcium oxide, strontium oxide, or a combination thereof, said crystalline reaction products comprising a phase or phases within said alpha alumina matrix,
- said abrasive grain having an average hardness of at least 17 GPa.
1 more element
A ceramic abrasive grain comprising:
- (a) an alpha alumina matrix;
- and
- (b) one or more crystalline reaction products, each comprising aluminum oxide, a rare earth oxide selected from the group consisting of praseodymium oxide, samarium oxide, europium oxide, holmium oxide, lanthanum oxide, gadolinium oxide, dysprosium oxide, cerium oxide, neodymium oxide, erbium oxide, and mixtures thereof, and at least 0.07 percent by weight, based on the total weight of said abrasive grain, of strontium oxide, said crystalline reaction products comprising a phase or phases within said alpha alumina matrix,
- said abrasive grain having an average hardness of at least 17 GPa.
1 more element
Dependencies are inferred from the claim text.