Fracture toughness for copper oxide superconductors

Details Fracture toughness for copper oxide superconductors Fracture toughness for copper oxide superconductors

1991-09-18

1993-04-13

Bell, Mark L.

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

505785, 505780, 505782, 505783, 252518, 252521, 501103, 501104, 501123, 501126, 501152, H01B 1206, H01L 3912, H01L 3902

Patent

active

052023060

ABSTRACT:
An oxide-based strengthening and toughening agent, such as tetragonal Zro.sub.2 particles, has been added to copper oxide superconductors, such as superconducting YBa.sub.2 Cu.sub.3 O.sub.x (123) to improve its fracture toughness (K.sub.IC). A sol-gel coating which is non-reactive with the superconductor, such as Y.sub.2 BaCuO.sub.5 (211) on the ZrO.sub.2 particles minimized the deleterious reactions between the superconductor and the toughening agent dispersed therethrough. Addition of 20 mole percent ZrO.sub.2 coated with 211 yielded a 123 composite with a K.sub.IC of 4.5 MPa(m).sup.0.5.

REFERENCES:
patent: 4985379 (1991-01-01), Egerton et al.
Sakai et al., "Superconductivity of YBa.sub.2 Cu.sub.3 O.sub.7-x by Addition of Reactive Fine Powders" Jap. Jour. Appl. Phy., vol. 30, No. 2, Feb. 1991, pp. 246-250.
Cheung et al., "Superconductor-Substrate Interactions of Y-B.sub.a -Cu Oxide" J. Mat. Res., vol. 4, No. 1, Jan./Feb. 1989, pp. 1-15.

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