Finely divided metal oxides and sintered objects therefrom

Chemistry of inorganic compounds – Radioactive – Thorium compound

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2523011R, 264 05, 264 56, 423 3, 423 21, 423 23, 423 49, 423 53, 423 62, 423 69, 423 87, 423 89, 423 99, 423111, 423138, 423155, 423263, 423604, 423608, 423625, C01F 1500, C01I 1700, C01F 702, C01G 102

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040655440

ABSTRACT:
Finely-divided metal oxides are prepared by the steps of (a) contacting a compound of a metal with a carbohydrate material to obtain an intimate mixture thereof, (b) igniting this mixture to oxidize the same and to insure conversion of substantially all of said metal compound to a fragile agglomerate of its metal oxide, and (c) pulverizing the product of step (b) to form a finely-divided metal oxide powder having a mean particle size below about 1.0 micron. Certain of the finely-divided metal oxide powders produced by this process have the useful property of sinterability at temperatures significantly lower than metal oxide powders heretofore readily available. The powders are useful in the preparation of high strength compacted shapes for use in high temperature and/or corrosive environment, in the preparation of refractory cements, catalysts, catalysts supports and the like.

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patent: 3417028 (1968-12-01), Montgomery et al.
patent: 3432314 (1969-03-01), Mazdiyazni et al.
patent: 3438723 (1969-04-01), Pechini
patent: 3514252 (1970-05-01), Levy et al.

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