Method of producing high-temperature superconducting ceramics ma

Details Method of producing high-temperature superconducting ceramics ma Method of producing high-temperature superconducting ceramics ma

1989-12-01

1991-05-21

Dixon, Jr., William R.

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

505725, 264 69, H01L 3912

Patent

active

050175483

ABSTRACT:
A method for producing high-temperature superconducting ceramic material through mechanical orientation including mixing starting materials in powdered form in proportions effective to produce a high-temperature superconducting oxide ceramic having anisotropic crystal grains and shaping the mixture. Next, the shaped mixture is calcined at a temperature ranging from 600.degree. to 900.degree. C. and fired at a temperature higher than 1,000.degree. C. in an oxygen atmosphere for a time effective to produce a superconducting oxide ceramic having crystal grains. According to the invention, the superconductive oxide ceramic is then pulverized into particles having either a plate-like form or a needle-like form based on the anisotropic form of the crystal grains. Particles of a selected size are placed into a vessel and vibrated with an acoustic vibrator means under conditions effective to cause the pulverized particles to turn toward a common preferred orientation to provide oriented particles. Then, the oriented particles are shaped by applying pressure to the vessel in a direction perpendicular to the common preferred orientation and fired at a temperature ranging from 900.degree. to 1,000.degree. C. for a time effective to produce the high-temperature superconducting oxide ceramic material with anisotropic crystal structure.

REFERENCES:
Grader et al., "Improved pressforging of Ba.sub.2 YCu.sub.3 ZO.sub.x Superconductor", Appl. Phys. Let. 52(21) May 23, 1988, pp. 1831-1833.
Jin et al. "Processing for High Critical Currents in YBa.sub.2 Cu.sub.3 O.sub.7-x ", High Temp. Superconductors II, Apr. 1988, pp. 153-166.
Neurgaonkar et al. "Hot-Pressed Densification of High-Temp. Superconducting Ba.sub.2 Ln.sup.3+ Cu.sub.3 O.sub.7-x Ceramics", Mat. Res. Bull., vol. 23, pp. 143-147, 1988.

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