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Mfr. of high temp. superconductors with melt-structured grain boundaries - comprises homogeneously distributing silver@ in film, heating superconducting part to 910-960 deg. C., cooling in inert atmos., then oxygen@ annealing
Mfr. of high temp. superconductors with melt-structured grain boundaries - comprises homogeneously distributing silver@ in film, heating superconducting part to 910-960 deg. C., cooling in inert atmos., then oxygen@ annealing
Mfr. of high temp. superconductors with melt structured grain boundaries consists of first forming a device from superconductor material or a material of corresponding compsn. and then annealing this. The features of the process are as follows: in the material which forms the device 1-50 wt.% Ag are present distributed homogeneously, the superconductor part is then heated to a temp. over 910 and not above 960 deg.C., and held there pref. for 5-20 hrs., the part is then cooled in inert gas with 0.01-1.0 vol.% O2, pref. 0.3-0.5 vol.% or with a change from a low to a high O2-content within the range quoted, at a rate of 0.5-10 deg.K. per hour, pref. 1-5 deg. K/hr., to a temp. of 890-910 deg.C. Then the standard O2 ambient anneal is carried out. Esp. claimed is the use of YBaCuOx with 3-10 wt.% Ag. The first anneal is pref. carried out at 920-940 deg.C. Also claimed is the process in which the part is first heated to a temp. of 935-960 deg.C., then cooled fast at a rate of 20-100 deg.K. per hour to a value between 910 and 935 deg.C. and held there for 5-20 hrs. USE/ADVANTAGE - The process generates parallel continuous crystals in a deposited film, some of which extend for the length of the part and have a width of 20-30 micron and thickness of 1 micron. The process is used to mfr. superconductor films on a Ag-substrate for use in magnets, electrical machines or energy transmission cables.
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