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The Role of Oxygen in the Hot Isostatic Pressing of High Tc Superconductors

Published online by Cambridge University Press:  15 February 2011

John V. Niska  and
Bengt Loberg
John V. Niska
Affiliation:
Luleå University of Technology, Dept. of Engineering Materials, S-95187 Luleå, Sweden
Bengt Loberg
Affiliation:
Luleå University of Technology, Dept. of Engineering Materials, S-95187 Luleå, Sweden
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Abstract

The bismuth-based 2212 and 2223 superconductors and the yttrium-based 123 and 124 high Tc superconductors are oxide ceramics, so that oxidizing conditions must be maintained in the HIP to avoid oxygen loss and decomposition. This has been done in an argon gas HIP by using glass encapsulation, but internal gas pressure retards densification. The thermodynamics of the release of oxygen by the superconductive ceramics and the stability of the metal to oxygen can be shown on a free energy diagram (Ellingham diagram). The base metals (as Fe and Cu) are reactive with respect to superconductive ceramics but not silver.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 251: Symposium S – Pressure Effects on Materials Processing and Design , 1991 , 335
Copyright
Copyright © Materials Research Society 1992

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References

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