Hoechst Aktiengesellschaft

Nexans Superconductors Gmbh

Nexans Superductors Gmbh

Johannes Holzem

Joachim Bock

Eberhard Preisler

Werner Horst

Stephan Gauss

Guenter Brommer

Markus Grom

Gerhard Mietens

Friedrich-Wilhelm Dorn

Gerhard Nolte

Bernhard Hofmann

The invention relates to a high-temperature superconductor component with a particular cross-sectional area, which has a current-carrying section, the current-carrying section being in contact with a safety conductor in such a way that the critical current flowing on transition of the superconductor to normal conduction can be taken up without damage by the safety conductor in at least 1 second and rerouted, as well as a process for its production.

Protected superconductor component and process for its production

Protected superconducting component and method for producing the same

To produce tubular molded parts made of high-temperature superconductor oxide material based on bismuth, calcium, strontium and copper, a homogeneous melt of the oxide with a specified stoichiometry is allowed to run at temperatures of 900.degree. to 1100.degree. C. into a casting zone rotating about its horizontal axis. The solidified molded part is removed from the casting zone and it is annealed for 4 to 150 hours at 700.degree. to 900.degree. C. in an oxygen-containing atmosphere. A plant for producing tubular molded parts includes a rotatably arranged mold (4, 9) which is provided at least at one end face with a front plate 6 which reduces its free cross section, a runner 7 extending into the interior of the mold (4, 9) and a crucible 8 arranged above the runner 7 which is capable of feeding the runner 7 with melt (cf. FIG. 2 A).

Process for producing tubular molded parts of high temperature

Method for joining parts of ceramic high-temperature superconductor material of the composition Bi.sub.(2+a-b) (Sr.sub.1-c) Ca.sub.c) .sub.(3-a) Pb.sub.b Cu.sub.(2+d) O.sub.x, where a is 0 to 0.3, b is 0 to 0.5, c is 0.1 to 0.9 and d is 0 to 2 and x has a value depending on the state of oxidation of the metals present, the end faces of the parts located at a gap spacing apart from one another are heated by means of a fuel gas/oxygen flame to temperatures from 750.degree. to 875.degree. C. Simultaneously, a rod of the same material above the spacing gap is heated until the melt thereof drips off into the gap between the end faces of the two parts, completely filling the gap. At least the joint region between the two parts is then heat-treated for 7 to 100 hours at temperatures between 780.degree. and 850.degree. C.

Method for joining parts of ceramic high-temperature superconductor

The present invention relates to a method for the preparation of electrolytic manganese dioxide in which flocculent nuclei of a manganese oxide hydrate is dispersed in the electrolyte.

Process for the preparation electrolytic manganese dioxide

The disclosure relates to a process for removing molybdenum from aqueous salt solutions by adsorbing it on manganese dioxide. To this end, the salt solution is contacted with a bed of manganese dioxide (MnO.sub.2) precipitated electrolytically and transformed into granular material.

Process for removing molybdenum from aqueous salt solutions

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Huerth, Germany

Johannes Holzem