METHOD FOR OXYGENATION OF FUSED GRAIN-ORIENTED CERAMICS ON THE BASIS OF YBa2Cu3O7-? (??-YBCO) IN ISOSTATIC PRESSURE

摘要

The method for oxygenation of fused grain-oriented ceramics on the basis of YBa2Cu3O7-? (??-YBCO) in isostatic pressures includes its heating, conditioning to oxygenation of fused grain-oriented ceramics and its cooling. The method is performed in a gasostat. Pre-heating is made to temperature of beginning ortho-tetra transition of the structure YBa2Cu3O7-? (Y123) in inert gas flow at atmospheric pressure. It is continued ceramics heating. Step-by-step, inert gas is substituted for oxygen so that after the temperature lower than the temperature of fusing the structure Y123 have been reached, ceramics is conditioned at atmospheric pressure over the time of that fully enough for substitution inert gas for oxygen. Next cooling is performed in two stages. At the first stage, ceramics is cooling to temperature of finishing Y123 ortho-tetra transition simultaneously pressure is increased to values, at which oxygenation in equal condition for given temperature is occurred, and then ceramics is conditioned at this temperature to its oxygenation. At the second stage the heating is removed and ceramics is cooled in gasostat to the room temperature, then pressure is removed.