Sintered sol gel alumina abrasive filaments
AssigneeNorton Company
InventorsCharles V. Rue, Ronald H. van de Merwe, Ralph Bauer, Scott W. Pellow, Thomas E. Cottringer, Richard J. Klok
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Abstract
A filament shaped sintered alumina based abrasive made up predominantly of fine alpha alumina crystals.
Claims14
A sintered sol gel filament shaped alumina based abrasive comprised of sintered alpha alumina crystals, said filament shaped alumina based abrasive having an average aspect ratio of at least ob 1 and a hardness of at least 16 GPa, said alpha alumina crystals having a size no greater than 1 micron.
A method of making a sintered filament shaped alumina based abrasive containing alpha alumina crystals, said alpha alumina crystals having a size of about 1 micron or less, comprising the steps of:
- providing a gelled dispersion of submicron hydrated alumina particles;
- shaping said gelled dispersion into filaments;
- drying the filaments;
- firing said dried filaments to a temperature between 1909.degree. C. and 1500.degree. C. for a time selected to convert the alumina in said filaments to a ceramic body, the major portion of which is made up of alpha alumina crystals of about 1 micron or less in size.
Dependencies are inferred from the claim text.