Superconducting Ceramic-Metal Structure
Original Publication Date: 1989-Sep-01
Included in the Prior Art Database: 2005-Jan-28
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.