Rare earth oxide powder

Details Rare earth oxide powder Rare earth oxide powder

1993-05-28

1994-02-15

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Yttrium, lanthanide, actinide, or transactinide containing

C04B 3550, C04B 3551

Patent

active

052866882

ABSTRACT:
Proposed is a green ceramic body prepared from an aqueous slurry of a rare earth oxide powder capable of giving an aqueous slurry having greatly improved stability of the aqueous slurry thereof in respect of the consistency over a long period. The improved rare earth oxide powder can be prepared by: (a) blending a rare earth oxide powder with a flux composition which is, for example, a combination of a boron oxide constituent and an oxide, carbonate or chloride of an alkali metal or alkaline earth metal element in an amount in the range from 0.1 to 5% by weight based on the rare earth oxide powder to give a uniform blend; (b) calcining the blend at a temperature of 1200.degree. to 1400.degree. C. for 0.5 to 24 hours; (c) cooling the calcined blend to room temperature to give a semi-sintered mass; (d) disintegrating the semi-sintered mass into a powdery form hav-ing a specific surface area not exceeding 3 m.sup.2 /g; and (e) subjecting the powder to a leaching treatment with water to remove any water-soluble fraction of the flux composition.

REFERENCES:
patent: 3108887 (1963-10-01), Lenie et al.
patent: 3185652 (1965-05-01), Kleber et al.
patent: 4292081 (1981-09-01), Watanabe et al.
patent: 4755492 (1988-07-01), Greskovich et al.
patent: 5017532 (1991-05-01), Sonnenberg et al.
patent: 5061560 (1991-10-01), Tajima et al.
patent: 5082810 (1992-01-01), Bergna et al.

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