SUPERCONDUCTING CERAMICS HAVING SUPERIOR WATER RESISTANCE

摘要

PURPOSE:To obtain superconducting ceramics having considerably improved water resistance by adhering a water resistance coating film to the surface of a superconducting ceramic sintered body having a rhombic phase stable at low temp. and a specified compsn. CONSTITUTION:Powdery starting material having a rhombic phase stable at low temp. and a compsn. represented by a formula MBa2Cu3O7-x (where M is Y or La and x=0-0.25) is press-sintered at 550-600 deg.C under 200-2000kg/cm<2> pressure in an atmosphere contg. >=20vol.% O2. A thermosetting or thermoplastic resin such as epoxy resin, acrylic resin or urethane resin is adhered to the surface of the resulting sintered body by dipping, spraying or other method. The surface of the sintered body is isolated from moisture in the air and water in various service atmospheres, the resistance to the elution of the sintered body and the deterioration of the characteristics due to water are considerably improved and superconducting ceramics having superior water resistance is obtd.