Firing fines
AssigneeNorton Company
InventorsRalph Bauer, Thomas Edward Cottringer, Martin Bradley Barnes
Life of this patent
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Abstract
Fine powders of ceramic materials can be obtained by firing a precursor powder in a rotary kiln while carried on coarse carrier particles.
Claims9
A process for the production of a powdered ceramic material which comprises feeding a mixture comprising carrier particles of an inert material having a particle size of from about 3 to 30 mm and a precursor of the ceramic material in the form of a powder having an average particle size smaller than about 65 microns in a weight ratio of carrier to precursor of from about 3:1 to about 15:1 into a rotary kiln and firing at a temperature sufficient to effect conversion of the precursor to the ceramic material.
A process for producing alpha alumina in the form of a powder with an average particle size of from about 5 to about 40 microns which comprises feeding a mixture comprising a powder of a transitional alumina with a particle size less than about 65 microns and carrier particles of alpha alumina with an average particle size of from about 6 to 15 mm, in a carrier to powder weight ratio of from 5:1 to about 10:1, into a rotary kiln maintained at a temperature above the conversion temperature of the precursor to alpha alumina and thereafter separating alpha alumina powder from the carrier particles.
Dependencies are inferred from the claim text.