| 摘要 |
<p>A process for fabricating superconducting ceramics materials composed essentially of a yttrium-including rare earth element, an alkaline earth metal, copper and balance oxygen and unavoidable impurities, and optionally containing a metal originating from an oxygen supplying agent is disclosed, which comprises: (a) providing starting powder composed of: (i) a member selected from the group consisting of (1) a mixt powder composed of powders of: (1-1) a yttrium-including rare earth element oxide, (1-2) an alkaline earth metal oxide, and (1-3) copper oxide, the mixture having a composition substantially the same as that of a contemplated superconducting ceramics, (2) a mixt powder composed of powders of: (2-1) a partial compound between any two of the component oxides constituing a contemplated supercoductive ceramics secelected from (1-1), (1-2) and (1-3), and (2-2) the rest of the component oxides selected from (1-1), (1-2) and (1-3), the mixture having a composition substantially the same as that of a contemplated superconducting ceramics, (3) powder of a superconducting ceramics composed essentially of a yttrium-including rare earth element, an alkaline earth metal, copper and balance oxygen and unavoidable impurities, (4) a mixed powder composed of at least two members selected from the mixt powders (1), (2) and (4); and (ii) optionally an oxygen-supply agent; (b) placing said starting powder in a metal casing and sealing said metal casing; (c) applying explosion force to said starting powder from outside of said metal casing to render said starting powder shock-compressed; (d) optionally heat-treating said starting powder when said starting powder is the mixt powder (1-1), (1-2) or (1-4) at a temperature sufficient for calcining said starting powder prior to or after said application of explosion force; (e) processing said explosively compressed product to produce an article having a predetermined form; and (f) optionally heat-treating said article at a temperature of from 300 DEG C to 950 DEG C. g</p> |
