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. 16, 1999
Filed:
Apr. 07, 1995
Lawrence D Woolf, Carlsbad, CA (US);
General Atomics, San Diego, CA (US);
Shimabun Co., Ltd., Kakogawa, JP;
Abstract
A melt processing method for bulk or thick film fabrication of RE123 superconductor material includes the steps of using Nd in the RE123 to increase the recrystallization speed of the RE123, and using a heavy rare earth in the RE123 to establish the peritectic melting point of the RE123 somewhere below the melting point of silver. Within these requirements, the method essentially includes heating the RE123 above its peritectic melting point, and then cooling the resultant decomposed material to recrystallize the RE123. The heavy rare earths to be used for lowering the RE123 peritectic melting temperature include Lu, Yb, Tm or Er or mixtures thereof. The addition of RE211, silver and the use of a low oxygen partial pressure also contribute to a lowering of the melting point of the RE123. When using Nd to accelerate the processing time, the RE123 can include a first component of Nd.sub.1-z R.sub.z 123 and a second component of Nd.sub.1-y R.sub.y 211. For these components, R is one of the heavy rare earths, z is between 0 and approximately 0.9, and y is between 0 and approximately 0.9.