Method of producing high-temperature superconducting ceramics material by mechanical orientation
US5017548A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 1, 1989 |
| Grant date | May 21, 1991 |
| Priority date | — |
| Expiry date | Dec 1, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S505/725
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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 …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.