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Influence of oxygen partial pressure and silver additions on microstructure and related properties of YBCO superconductors

机译：氧分压和银添加量对YBCO超导体组织和相关性能的影响

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Microstructure has a great influence on the mechanical and superconducting properties of YBCO. Mechanical properties of YBCO can be improved by both modifying the monolithic microstructure and developing composites of YBCO with silver (Ag). When monolithic YBCO was sintered to high densities ((approx) 91%) at a relatively low temperature ((approx) 910(degrees)C) by controlling oxygen partial pressure during sintering, the result was a small-grain microstructure (average grain size (approx) 5 (mu)m) and hence a high strength of 191 (plus minus) 7 MPa. Addition of Ag as a second phase further improved the strength of YBCO. Composites of YBCO with 10 to 15 vol % Ag has a strength of 225 (plus minus) 6 MPa and a fracture toughness of 3.3 (plus minus) 0.2 MPa(radical)m. These improvements are believed to be due to compressive stresses in the YBCO matrix as a result of thermal mismatch between the YBCO and Ag phases. Furthermore, the Ag particles may provide increased resistance to crack propagation by pinning the crack. On the other hand, addition of Ag as a dopant to substitute for Cu sites in YBCO has a profound but nonmonotonic effect on grain microstructure and the resulting critical current density. (ERA citation 17:016062)

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