Process for the production of a crystal-oriented surface layer o

Details Process for the production of a crystal-oriented surface layer o Process for the production of a crystal-oriented surface layer o

1990-03-08

1991-12-10

Beck, Shrive

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

505733, 427 62, 427190, 427189, B05D 302

Patent

active

050718282

ABSTRACT:
Process for the production of a polycrystalline, crystal-oriented layer of a high temperature superconductor of the class (Y,RE) Ba.sub.2 Cu.sub.3 O.sub..apprxeq.7 on a substrate or between two substrates of Ag or an Ag alloy containing up to 20% by weight Au, Pd or Pt, wherein a first powder layer, of at most 5 .mu.m thickness and consisting of the simple oxides and/or mixed oxides of the elements Y, Ba, Cu in the ratio Y:Ba:Cu:O=1:2:3:6.5, is first applied, and on it is applied a second powder layer of the superconducting substance (Y,RE) Ba.sub.2 Cu.sub.3 O.sub..apprxeq.7 in a thickness of 5-10 .mu.m, and the whole is sintered in an O.sub.2 -containing atmosphere.

REFERENCES:
Shimizu et al., "Tape Conductor Fabrication Processes for High-Tc Ba.sub.2 YCu.sub.3 O.sub.7-y ", Jpn. J. Appl. Phys. 27(3), Mar. 1988, L414-416.
Tachikawa et al., "Fabrication of Superconducting Y-Ba-Cu Oxide Through an Improved Diffusion Process", Jpn. J. Appl. Phys. 27(8), Aug. 1988, L501-503.
Severin et al., "Superconducting YBa.sub.2 Cu.sub.3 O.sub.x Thin Layers by Solid State Diffusion", Mat. Res. Rull., vol. 23 (1988), pp. 707-717.
Gurvitch et al., "Preparation and Substrate Reactions of Superconducting Y-Ba-Cu-O Films", Appl. Phys. Lett. 51(13), Sep. 1987, pp. 1027-1029.
Singh et al., "Mechanical and Superconducting Properties of Sintered Composite YB.sub.2 Cu.sub.3 O.sub.7-.delta. Tape on a Silver Substrate", Appl. Phys. Lett. 53(3), Jul. 1988, pp. 237-239.
Oda et al., "Superconductivity of Y.sub.l Ba.sub.2 (Cu.sub.l-x Fe.sub.x).sub.3 O.sub.y ", Jpn. J. Appl. Phys. 26(10), Oct. 1987, L660-L663.
Escudero et al., "Superconductivity at 90K in the Y-Ba-Al-Cu-O System", Jpn. J. Appl. Phys. 26(6), Jun. 1987, L1019-L1020.
Japanese Journal of Applied Physics, vol. 27, No. 7, Jul. 1988, K. Koshino et al.: "Preparation of Superconducting Bl-Sr-Ca-Cu-O Printed Thick Films on MgO Substrate an Ag Metal Tape", pp. L1297-L1299.
F. Kloucek, W. E. Rhine, H. K. Bowen, "Thick Films of YBa.sub.2 Cu.sub.3 O.sub.x Fabricated from Colloidal Solutions", International Conference on High-T.sub.c Superconductors, Interlaken 1988, pp. 798, 799.
P. Murugaraj et al., "Preparation of Highly Oriented Polycrystalline YBa.sub.2-y Cu.sub.3 O.sub.x Superconductors", Solid State Communications, vol. 66, No. 7, 1988, pp. 735-738.
T. Takenaka et al., "Superconducting Properties of Grain-Orientated YBa.sub.2 Cu.sub.3 O.sub.7-x Ceramics", Japanese Journal of Applied Physics, vol. 27, No. 7, 1988, L1209-L1212.
Junji Tabuchi et al., "Preparation of Superconducting Y-Ba-Cu-O Thick Films with Preferred C-Axis Orientation by a Screen-Printing Method": Appl. Phys. Lett. 53(7), Aug. 15, 1988.
J. T. Markert et al., "Magnetism, Superconductivity, and Chemical Substitutions in YBa.sub.2 Cu.sub.3 O.sub.7-.delta. ", MRS Bulletin/Jan. 1989.

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