The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 15, 1994
Filed:
May. 28, 1993
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
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.