Minnesota Mining and Manufacturing Company

Lanxide Technology Company, LP

Alvin P Gerk

Marc S Newkirk

Christopher R Kennedy

Adam J Gesing

Michael A Rocazella

Robert J Seider

Paul V Kelsey

Robert A Wolffe

Daniel J Frydrych

A process for forming a ceramic alumina-based abrasive grain from a sol gel which contains aluminum oxide monohydrate, a dissolved metal containing sintering aid and sufficient sodium and/or calcium compound to provide in the ceramic from above about 0.05 to about 1.8 weight percent sodium plus calcium, provided that the weight percent calcium is from 0 to about 1.8 and the weight percent sodium is from 0 to about 0.4. The high sodium and calcium is permitted due to rapid heating of the sol gel after drying through a temperature range of from below about 800.degree. C. to above about 1200.degree. C., prior to sintering the dried gel at a temperature above 1200.degree. C. A grain made by the process and coated, bonded and non-woven abrasive articles comprising the grain.

Superior high alkali metal and calcium sol gel abrasive and processes

The invention comprises a method of making self-supporting ceramic and ceramic composite structures by the oxidation reaction of a body of molten parent metal precursor with a vapor-phase oxidant to form an oxidation reaction product. This reaction or growth is continued to form a thick, self-supporting ceramic or ceramic composite body. The body is recovered and in a separate subsequent operation, at least a portion of a surface is coated with one or more materials in order to effect desired changes in the properties of the surface, e.g., hardness, corrosion resistance.

Production of ceramic and ceramic-metal composite articles with surface

The sol-gel process for forming dense, alumina-base ceramics, the process comprising

Process for improved densification of sol-gel produced alumina-based

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Newark, DE, United States of America

Alvin P Gerk