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    Use of high-purity fused silica granules with a low BET surface for the production of high-quality glass products, e.g. optical fibres, crucibles, lenses, diffraction gratings, insulators and industrial apparatus
    31.
    发明专利
    Use of high-purity fused silica granules with a low BET surface for the production of high-quality glass products, e.g. optical fibres, crucibles, lenses, diffraction gratings, insulators and industrial apparatus 未知

    公开(公告)号：DE102007049158A1

    公开(公告)日：2009-04-16

    申请号：DE102007049158

    申请日：2007-10-13

    Applicant: EVONIK DEGUSSA GMBH

    Inventor： OSWALD MONIKA ,  SCHULZE-ISFORT CHRISTIAN ,  SCHUMACHER KAI

    IPC: C03C3/06 ,  C01B33/12 ,  C01B33/18

    Abstract: The use of fused silica granules with an average diameter of 1 micron to 5 mm, a BET surface of less than 1 m 2>/g and an impurity content of less than 50 ppm for the production of glass blanks and mouldings (e.g. for optical fibres), crucibles, optical components, diffraction gratings, insulators, industrial containers and apparatus, glass rods or tubes and lamps, for coating various substrates, as a filler in polymers and other materials, as a polishing material, or as a support material for solar cells. The use of fused silica granules with an average diameter of 1 micron to 5 mm, a BET surface of less than 1 m 2>/g and an impurity content of less than 50 ppm for the production of glass blanks ("boules"), glass mouldings (e.g."overcladding tubes"or"core rods"for optical fibres), melting pots (e.g."crucibles"), optical lenses, prisms and photomasks, diffraction gratings, electrical thermal and magnetic insulators, containers and apparatus for the chemical, pharmaceutical and semiconductor industries, glass rods and tubes, for coating metals, plastic, ceramics or glass, as a filler in metals, glasses, polymers, elastomers and paints, as polishing material for semiconductor materials and electrical switching circuits, for the production of lamps and as support material in the production of solar cells.

    33.
    发明专利
    未知

    公开(公告)号：DE102007035955A1

    公开(公告)日：2009-02-05

    申请号：DE102007035955

    申请日：2007-07-30

    Applicant: EVONIK DEGUSSA GMBH

    Inventor： MEYER JUERGEN ,  SCHOLZ MARIO ,  SCHUMACHER KAI

    IPC: C01B33/18 ,  C08K3/36 ,  C08K9/06 ,  C08L63/00

    Abstract: Surface-modified, pyrogenically prepared silica is prepared by subjecting the pyrogenically prepared silica, which is in the form of aggregates of primary particles and possesses a BET surface area of 150±15 m2/g, the aggregates having an average area of 12 000-20 000 nm2, an average equivalent circle diameter (ECD) of 90-120 nm and an average circumference of 1150-1700 nm, to surface-modification in a known way. It can be used as a filler for thickening liquid systems.

    36.
    发明专利
    未知

    公开(公告)号：DE102006017701A1

    公开(公告)日：2007-10-25

    申请号：DE102006017701

    申请日：2006-04-15

    Applicant: DEGUSSA

    Inventor： SCHUMACHER KAI ,  MOERTERS MARTIN ,  MANGOLD HELMUT ,  HASENZAHL STEFFEN

    IPC: C01B33/18 ,  B01J29/89 ,  C01B33/14 ,  C01B39/08 ,  C01G1/02 ,  C01G23/04

    Abstract: Process for the preparation of a pyrogenic silicon-titanium mixed oxide powder having a dioxide content and titanium dioxide content is greater than 99.7% by weight, all percentages by weight relating to the total amount of the powder, in which - 97.0 ± 1.5 parts by weight calculated as SiO 2 of silicon halide and 3.5 ± 1.5 parts by weight calculated as TiO 2 of titanium halide are evaporated, the vapours are taken to a mixing chamber, - hydrogen and primary air are taken to the mixing chamber separately therefrom, - the mixture of the vapours of silicon halide and titanium halide, hydrogen-containing combustible gas and primary air is subsequently ignited in a burner and the flame is burned into a reaction chamber, - secondary air is additionally introduced into the reaction chamber, the solid is subsequently separated from gaseous substances, and - the solid is subsequently freed as far as possible from halide-containing substances by treatment with steam at temperatures of 250 to 700°C - the amount of the required substances consisting of silicon chloride, titanium chloride, combustible gas, primary air and secondary air being chosen such that an adiabatic flame temperature T ad results, for which the following is true: 900 �¢ °C

    40.
    发明专利
    未知

    公开(公告)号：DE10308722A1

    公开(公告)日：2004-09-09

    申请号：DE10308722

    申请日：2003-02-28

    Applicant: DEGUSSA

    Inventor： SCHUMACHER KAI ,  KERNER DIETER ,  IHMIG RONALD

    IPC: B01F33/40 ,  B01F13/02 ,  B01F3/18 ,  B01F5/24 ,  H01L21/302

    Abstract: Method for the homogenisation of nanoscale powders, in which mixtures of nanoscale powders having the same or different chemical composition and/or structure and in solid form are introduced in the presence of a regulable gas stream into a vessel, the gas stream being adjusted so that the nanoscale powders remain in suspension and are thoroughly mixed.

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