Process for preparing an ingot of high critical temperature superconducting oxide.

摘要

Process for the manufacture by melting-solidification of an ingot made of superconductive oxide with a high critical temperature, belonging especially to the classes YBaCuO, BiSrCaCuO, TlBaCaCuO, characterised in that the starting point is an ingot (1) of oxide which has the appropriate stoichiometry, which is held horizontally by levitation on a gas film inside a furnace (40), that it is melted, that a vertical temperature gradient is established in the said furnace so that a nucleation begins in the lower part of the said ingot, that, while the said temperature gradient is maintained, the overall temperature of the furnace is lowered at a rate lower than or equal to 0.1 DEG C/hour to the temperature corresponding to a complete solidification, and in that finally a conventional oxygenation treatment is applied to the said ingot.