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    11.
    发明专利
    未知

    公开(公告)号：DE3781593D1

    公开(公告)日：1992-10-15

    申请号：DE3781593

    申请日：1987-06-11

    Applicant: BASF AG

    Inventor： MAIR GUNTHER DR ,  STECK WERNER DR

    IPC: C01G53/00 ,  A61K49/18 ,  C01G49/00 ,  C01G51/00 ,  C09K9/00 ,  H01F1/36 ,  H01F1/37 ,  H01F1/44

    Abstract: The general compsn. of the particles is : MvMnwZnxFeyOz in which M is Co and/or Ni, v and w vary from 0-0.998 but are not both equal to 0 at the same time, x is 0.001-0.998, y is 2.001-2.998 and z is 3.001-4 with the restrictions : v+w+x = 0.002-0.998 and v+w+x+y=3. The particles are pref. coated with anionic tensids or acid phosphoric-acid esters and dispersed in a resp. non-polar or polar liq. forming a colloid. They are mfd. by pptn. from a watery soln. contg. the metal-salts by a base and, in the case of a non-polar suspension, coated with tensids. The particle are then flocculated by adding methanol, sepd. from the liq. and redispersed in a non-polar liq.. They can then be re-ppted., sepd. and redispersed in a non-polar liq. several times. Alternatively the particles are coated with an acid phosphoric acid ester after pptn. from the metal-salt soln.. The particles are then transferred into a polar liq. with a higher b.pt. than water, pref. 110-250 deg.C, by mixing and boiling off the water. Then the suspension is mixed with a second polar liq. with an even higher b.pt. and the first polar liq. removed. In both above methods the dispersion may be washed with a watery base and then with water until the effluent is neutral. The processing is pref. carried out in an inert gas ambient.

    Process for preparing pulverulent metal nitrides
    16.
    发明专利
    Process for preparing pulverulent metal nitrides 未知

    公开(公告)号：DE3901725A1

    公开(公告)日：1990-07-26

    申请号：DE3901725

    申请日：1989-01-21

    Applicant: BASF AG

    Inventor： MAIR GUNTHER DR ,  BITTLER KNUT DR ,  STERZEL HANS-JOSEF DR

    IPC: C01B21/06 ,  C01B21/068 ,  C01B21/076

    Abstract: Pulverulent metal nitrides are prepared in a two-stage process by reacting metal-halogen compounds (metal halides) with ammonia in a first stage and heat treating the reaction products obtained in the first stage at temperatures of from 500 to 1700@C. The metal-halogen compounds are introduced in the form of droplets into a reaction zone having an ammonia atmosphere. The process is particularly suitable for preparing silicon nitride.

    18.
    发明专利
    未知

    公开(公告)号：DE3633130A1

    公开(公告)日：1988-03-31

    申请号：DE3633130

    申请日：1986-09-30

    Applicant: BASF AG

    Inventor： MAIR GUNTHER DR

    IPC: C01G49/00 ,  C04B35/26 ,  G11B5/706 ,  H01F1/10 ,  H01F1/11 ,  H01F1/34 ,  H01F1/36 ,  H01F10/18 ,  H01F41/16

    Abstract: Finely divided, spherical, two-layer solid particles having a diameter of from 5 to 100 nm and consisting of (A) from 60 to 70% by weight of a core of spherical, rhombohedral alpha -Fe2O3 having a purity greater than 98% and (B) from 30 to 40% by weight of a shell of a basic metal hydroxide sulfate which has an alkali metal ion content of less than 500 ppm and is of the general formula MvMnwZnx(OH)y(SO4)z where M is Mg, Co, Ni, Cd, divalent Fe and/or divalent Cu, v is from O to 0.8, w is from 0.1 to 0.9, x is from 0.1 to 0.9, y is from 1.01 to 1.99, z is from 0.005 to 0.505, v++x 1 and 0.5 y+z=1, and a process for the production of finely divided, magnetic, cubic or hexagonal ferrite particles.

    19.
    发明专利
    未知

    公开(公告)号：DE3539777A1

    公开(公告)日：1987-05-14

    申请号：DE3539777

    申请日：1985-11-09

    Applicant: BASF AG

    Inventor： RITTER KLAUS DR ,  MICHAELSEN KLAUS ,  MAIR GUNTHER DR

    IPC: F16J15/40 ,  F16J15/43 ,  F16J15/54 ,  F04D29/10

    Abstract: A shaft seal containing magnetic liquid, for pump shafts or the like, consists of a permanent magnet which surrounds the shaft and is a distance away and one or more pole pieces connected to the said magnet. The pole piece, together with the shaft surface, forms an air gap in which the magnetic liquid is held by the magnetic field, so that a liquid sealing ring is produced. A volume of gas located between the magnetic liquid seal and the shaft channel to the medium prevents the magnetic liquid from coming into contact with the medium.

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