METHOD OF PRODUCTION OF A POROUS HIGH-TEMPERATURE SUPERCONDUCTING CERAMICS BASED ON BISMUTH Russian patent published in 2005 - IPC

FIELD: power industry; cryoelectronics; production of porous high-temperature superconducting ceramics based oh bismuth.

SUBSTANCE: the invention is pertaining to the field of power industry and cryoelectronics, in particular, to production of porous high-temperature superconducting ceramics based on bismuth. The technical result of the invention is production of a porous material based on the bismuthic high-temperature superconducting material possessing a great strength of pinning and a great strength of levitation. The method of production of porous high-temperature superconducting ceramics on the base of bismuth Pb_0.3Bi_01.8 Sr_1.9Ca₂Cu₃O_x including sintering of the material in two stages. The new in the invention is the fact, that at the first stage synthesize an intermediate product of nominal composition Pb_0.3Bi_01.8 Sr_1.9Ca_yCu₃O_x where 1.0 ≤ y ≤1.5, at the temperature of 800°C-820°C within 12-24 hours, and at the second stage they add calcium carbonate CaCO₃ in the produced intermediate product till obtaining the stoichiometric formula Pb_0.3Bi_01.8 Sr_1.9Ca₂Cu₃O_x with the following joint milling, press it and make its final sintering at the temperature of 830°-850°C within 200-300 hours.

EFFECT: the invention ensures production of a porous material based on the bismuthic high-temperature superconducting material possessing a great strength of pinning and a great strength of levitation.

6 dwg