Microcrystalline alumina-based ceramic articles

Details Microcrystalline alumina-based ceramic articles Microcrystalline alumina-based ceramic articles

C - Chemistry, Metallurgy

04

B

117/233, 261/38

C04B 35/10 (2006.01) C01F 7/02 (2006.01) C01F 7/30 (2006.01) C04B 35/111 (2006.01) C04B 35/622 (2006.01) C04B 35/624 (2006.01) C09K 3/14 (2006.01) D01F 9/08 (2006.01)

Patent

CA 1317978

ABSTRACT OF THE DISCLOSURE Microcrystalline alpha-alumina based ceramic articles comprising at least 60% alumina by weight in which substantially all the alumina is in the alpha phase having a uniform grain structure comprising alpha alumina crystallites with an average crystallite size less than 0.5 micrometer and a density greater than 90% theoretical are disclosed. Ceramic articles particularly useful as high modulus refractory fibers, among other shaped bodies such as beads, flakes, coatings, and shaped or randomly-shaped abrasive particles, are produced from a unique sol-gel process wherein hydroxy iron polymers are utilized to nucleate the alpha alumina transformation. An inherent advantage of the unique process disclosed is the resulting fine grained microstructure which is essential if a ceramic article such as an alpha alumina fiber is to have reasonable strength.

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