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:
Jul. 04, 2000
Filed:
Jul. 06, 1998
Noriki Hayashi, Osaka, JP;
Masato Murakami, Tokyo, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
International Superconductivity Technology Center, Tokyo, JP;
Abstract
Provided is a method of preparing a large-sized oxide superconducting bulk body having excellent characteristics and high homogeneity. The method is adapted to prepare an oxide superconducting bulk body by melt growth through a seed crystal method, and comprises steps of preparing a precursor by press-molding material powder obtained by mixing REBa.sub.2 Cu.sub.3 O.sub.7-z powder with RE.sub.2 BaCuO.sub.5 or RE.sub.4 Ba.sub.2 Cu.sub.2 O.sub.10 powder and a platinum additive, homogeneously semi-melting the precursor by holding the same at a holding temperature T.sub.1 .degree. C. (t.sub.1 +20.ltoreq.T.sub.1 .ltoreq.t.sub.1 +80 assuming that the melting point of the oxide superconducting bulk body is t.sub.1 .degree. C.) for a prescribed time, and crystal-growing the precursor at a temperature not more than the melting point t.sub.1 .degree. C.