Hydroxide-coated rare earth oxide particles

Details Hydroxide-coated rare earth oxide particles Hydroxide-coated rare earth oxide particles

1997-12-03

1999-06-22

Marcheschi, Michael

Compositions: ceramic

Ceramic compositions

Yttrium, lanthanide, actinide, or transactinide containing

423263, 428403, 427212, 427215, C04B 3550

Patent

active

059142871

ABSTRACT:
Proposed is a powder consisting of rare earth oxide-based composite particles having an average particle diameter in the range from 0.1 to 100 .mu.m, each of which has a composite structure consisting of a core of a rare earth oxide and a coating layer of a rare earth hydroxide, the coating layer of the rare earth hydroxide having an average thickness of at least 5 nm but not exceeding 10% of the average particle diameter of the composite particles. While a rare earth oxide powder is useful as a sintering aid of a ceramic powder which is used in molding usually in the form of an aqueous slurry, the composite particles when added to an aqueous slurry of a ceramic powder exhibit a remarkable effect as a viscosity stabilizer or gelation inhibitor of the aqueous slurry so that improvements can be obtained in the productivity of the manufacturing process and quality of ceramic products.

REFERENCES:
patent: 5461101 (1995-10-01), Rothon et al.
patent: 5569490 (1996-10-01), Imura et al.
patent: 5643844 (1997-07-01), Yasrebi et al.

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