| 摘要 |
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 DEG to 900 DEG C. and fired at a temperature higher than 1,000 DEG 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 DEG to 1,000 DEG C. for a time effective to produce the high-temperature superconducting oxide ceramic material with anisotropic crystal structure. |
