Process for preparing mixed oxides

Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing

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423592, 423617, 423624, 423625, 501 12, 501128, 501153, C01B 1314

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053167520

ABSTRACT:
A process for producing mixed oxides containing an alumina species in which a mixture of a hydrated alumina having a specified surface area (average crystal size), a fluid medium and a compound having the formula M.sub.x A.sub.y wherein M is selected from the group consisting of metals, silicon, boron, arsenic and tellurium, A is selected from the group consisting of oxygen and anions, x is from 1 to 4 and y has a value satisfying said formula depending on the valence of M, is formed into a uniform sol, the sol is recovered from the liquid medium and dehydrated, and the dehydrated product is de-agglomerated to produce a mixed oxide having an average particle size of about 1 micron or less.

REFERENCES:
patent: 4676928 (1987-06-01), Leach et al.
patent: 5030592 (1991-07-01), Komarneni et al.
patent: 5045514 (1991-09-01), Ismail et al.
Read, "Introduction to the Principles of Ceriamic Processing", John Wiley & Sons, 1988, New York, pp, 272-273.
Hoffman et al., "Dishasic Xerogels, A New Class of Materials: . . . " J. Am. Cer. Soc., vol. 67[7] pp. 468-471, (1984).
Mizuno et al., "Preparation of Highly Pure Fine Mullite Powder" J. Am. Ceram. Soc., 72[3] pp. 377-382 (1989).
Komarneni et al. "Application of Compositionally Diphasic Xerogells . . . " J. Am. Ceram. Soc., 69[7] pp. C-155-C-156 (1986).

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