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Browse Prior Art Database

Superconducting Ceramic-Metal Structure

IP.com Disclosure Number: IPCOM000036295D
Original Publication Date: 1989-Sep-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Chance, DA: AUTHOR [+6]

Abstract

The 90oK superconductor YBa2Cu3Ox is a ceramic and therefore not capable of withstanding large tensile stresses without fracture. It is also brittle and cannot be bent and used as a wire unless it can be placed in compression. A supporting material is therefore necessary for the superconductor to be used as a wire and for many practical applications. The supporting material should have the following properties: 1. It should be capable of withstanding temperatures up to 950oC so that it can be co-fired with the superconductor in air. 2. It should be bonded to the superconductor by an interface reaction between the oxides. 3. It should have a thermal expansion coefficient which is similar and preferably slightly higher than that of the superconductor. 4. It should be ductile.

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Superconducting Ceramic-Metal Structure

The 90oK superconductor YBa2Cu3Ox is a ceramic and therefore not capable of withstanding large tensile stresses without fracture. It is also brittle and cannot be bent and used as a wire unless it can be placed in compression. A supporting material is therefore necessary for the superconductor to be used as a wire and for many practical applications. The supporting material should have the following properties:
1. It should be capable of withstanding temperatures up to

950oC so that it can be co-fired with the

superconductor in air.
2. It should be bonded to the superconductor by an

interface reaction between the oxides.
3. It should have a thermal expansion coefficient which is

similar and preferably slightly higher than that of the

superconductor.
4. It should be ductile.

A strip combination of the superconductive ceramic 10 and support 12, as shown in Fig. 1, can be used as a superconducting wire and fabricated into loops for a superconducting magnet. The superconductor loops are kept in compression by winding loops, as shown in Fig. 2. The support 12 is in tension while the superconductive ceramic 10 is in compression. Support materials satisfying these criteria are typically Ni-Co-Fe-Cr alloys. Examples include INCONEL* alloys, NICHROME**, DURANICKEL*, Monel alloy and HAYNES*** alloy. *Trademark of International Nickel Corp. ** Trademark of Driver-Harris Corp. *** Trademark of Cabot Corp.

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