2.
    发明专利
    未知

    公开(公告)号:NO912333D0

    公开(公告)日:1991-06-17

    申请号:NO912333

    申请日:1991-06-17

    Applicant: HOECHST AG

    Abstract: For the production of tube-shaped mouldings of high-temperature superconductor material based on oxides of bismuth, calcium, strontium and copper, a homogeneous melt of the oxide mixture is allowed to run in a predetermined stoichiometry at temperatures from 900 to 1100 DEG C into a casting zone rotating about its horizontal axis. The solidified moulding is taken out of the casting zone and heat-treated for 4 to 150 hours at 700 to 900 DEG C in an oxygen-containing atmosphere. A plant for producing tube-shaped mouldings consists of a rotatably mounted mould (4, 9) which is provided at least on one end face with an end ring 6 reducing its free cross-section, a casting chute 7 protruding into the interior of the mould (4, 9) and a crucible 8 which is arranged above the casting chute 7 and through which the casting chute 7 can be charged with melt.

    PROCESS FOR THE PREPARATION OF FULLERENE

    公开(公告)号:CA2076314A1

    公开(公告)日:1993-03-07

    申请号:CA2076314

    申请日:1992-08-18

    Applicant: HOECHST AG

    Abstract: HOE 91/H 016 K Process for the preparation of fullerene In the process for the preparation of a C60/C70 mixture, known as fullerene, by vaporization of carbon under pressures of 0,05 to 3 bar, condensation of the gaseous carbon on cooled zones with the formation of a fullerene/carbon black mixture and separation of the fullerene from this mixture, the vaporization and condensation are carried out in oxygen-containing gases from the group comprising CO, CO2 and O2 or mixtures thereof.

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