Beta alumina manufacture

Details Beta alumina manufacture Beta alumina manufacture

1978-03-27

1980-03-18

White, Robert F.

Plastic and nonmetallic article shaping or treating: processes

Formation of solid particulate material directly from molten...

By extrusion spraying or gravity fall through orifice

106 65, 264 66, 429191, 429192, C04B 3510

Patent

active

041939549

ABSTRACT:
Anhydrous alumina powder, preferably powdered alpha-alumina, is formed into a high solids slurry in water containing one or more soluble compounds that yield Na.sub.2 O when heated in air, preferably a mixture of sodium carbonate and sodium nitrate, and optionally containing one or more soluble compounds that will yield lithium oxide, magnesium oxide or mixtures thereof, when heated in air. The slurry is rapidly dried, preferably by spraying in air, to precipitate the metal oxide precursor(s) and form an intimate substantially homogeneous mixture with the anhydrous alumina particles. This precursor powder is pressed into a shaped article, and heated to decompose the source(s) of metal oxide, react the components to form the desired beta-alumina phase, and sinter the article to produce the dense polycrystalline beta-alumina.

REFERENCES:
patent: 3795723 (1974-03-01), Clendenen
patent: 3959022 (1976-05-01), DeJonghe et al.
patent: 4052538 (1977-10-01), Eddy et al.
patent: 4083919 (1978-04-01), Pearlmon

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