Superconductor technology: apparatus – material – process – Processes of producing or treating high temperature... – With melting
Patent
1995-04-07
1999-02-16
Gorski, Joseph M.
Superconductor technology: apparatus, material, process
Processes of producing or treating high temperature...
With melting
505452, 427 62, H01L 3924
Patent
active
058720812
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.
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General Atomics
Gorski Joseph M.
Shimabun Co., Ltd.
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