公开(公告)号：DE3582605D1

公开(公告)日：1991-05-29

申请号：DE3582605

申请日：1985-02-22

Applicant: BASF AG

Inventor： STECK WERNER DR ,  JAKUSCH HELMUT DR ,  EBENHOECH FRANZ LUDWIG DR

IPC: C01G49/02 ,  C01G51/00 ,  C09C1/24 ,  G11B5/706

公开(公告)号：DE3678329D1

公开(公告)日：1991-05-02

申请号：DE3678329

申请日：1986-05-03

Applicant: BASF AG

Inventor： SCHWAB EKKEHARD DR ,  STECK WERNER DR ,  RUDOLF PETER DR ,  VAETH GUENTER ,  JAKUSCH HELMUT DR ,  KOVACS JENOE DR

IPC: H01F1/06 ,  B22F1/02 ,  B22F9/22 ,  B22F9/24 ,  G11B5/706

公开(公告)号：DE3580612D1

公开(公告)日：1991-01-03

申请号：DE3580612

申请日：1985-04-22

Applicant: BASF AG

Inventor： HIBST HARTMUT DR ,  JAKUSCH HELMUT DR

IPC: B22F9/22 ,  B22F9/26 ,  C01G49/00 ,  G11B5/706 ,  H01F1/11

Abstract: Finely divided ferrite powder of the general formula CoxFe3-xO4.5-0.5 x where x is from greater than zero to one, having an essentially isotropic particle shape, is prepared by oxidation of ferrite powder of the composition CoxFe3-xO4, where x has the same limits, with an oxygen-containing gas at from 150 DEG to 500 DEG C.

公开(公告)号：DE3608540A1

公开(公告)日：1987-09-17

申请号：DE3608540

申请日：1986-03-14

Applicant: BASF AG

Inventor： ARNDT VOLKER DR ,  MEYER BERND DR ,  FESER RAINER DR ,  STECK WERNER DR ,  JAKUSCH HELMUT DR

IPC: C01G49/06 ,  C09C1/24 ,  G11B5/706 ,  H01F1/11 ,  C09C3/00 ,  C09C1/62 ,  C21B15/00

Abstract: Acicular alpha -Fe2O3 is prepared from iron(III) salts by heating an alkaline aqueous suspension of iron(III) hydroxide in the presence of one or more organic substances which form complexes with iron(III) ions to a temperature of 100 DEG C. or less.

公开(公告)号：DE3408000A1

公开(公告)日：1985-09-12

申请号：DE3408000

申请日：1984-03-03

Applicant: BASF AG

Inventor： GRAU WERNER DR ,  JAKUSCH HELMUT DR ,  KOVACS JENOE DR ,  OHLINGER MANFRED DR ,  RUDOLF PETER DR ,  ROLLER HERMANN

IPC: G11B5/708 ,  G11B5/70 ,  G11B5/72

Abstract: The invention relates to magnetic recording carriers which comprise a non-magnetic carrier material and a magnetic coating adhesively applied thereupon and composed of fine-particled ferromagnetic metal powder, at least one unmagnetic wear-resistant metal oxide powder, which has a spherical form and is defined in terms of its size distribution and the quantitative proportion thereof, organic binder and the usual auxiliaries.

公开(公告)号：DE3161835D1

公开(公告)日：1984-02-09

申请号：DE3161835

申请日：1981-07-09

Applicant: BASF AG

Inventor： RUDOLF PETER DR ,  KOVACS JENOE DR ,  JAKUSCH HELMUT DR

IPC: G11B5/62 ,  G11B5/706 ,  H01F1/113

公开(公告)号：DE4120663A1

公开(公告)日：1992-12-24

申请号：DE4120663

申请日：1991-06-22

Applicant: BASF AG

Inventor： RICHTER HANS JUERGEN DR ,  SCHWAB EKKEHARD DR ,  JAKUSCH HELMUT DR ,  HIBST HARTMUT DR ,  GRAU WERNER DR ,  KNELLER ECKHART PROF DR ,  HAWIG REINHARDT

IPC: G11B5/706 ,  H01F1/03 ,  H01F1/057 ,  H01Q17/00 ,  H02K1/02

Abstract: A magnetisable material consists of at least two ferro- and/or ferrimagnetic phases which are magnetically coupled to each other by magnetic exchange coupling. At least one of the phases is a hard magnetic phase and at least one of the phases is a soft magnetic phase. The vol. percentage of the soft magnetic phase is at least 30%. At least 65% of the original saturation remanence is obtd. again after prior magnetic saturation in a direction corresp. to the application of an opposite magnetic field which is the same as the coercive field strength of the magnetic material, and after removing the field. The saturation remanence is at least 50% of the saturation magnetisation. The material is mfd. by spraying a melt of rare earth metals, Fe, B, a transition metal and Si on to a rotating metal roll in an inert atmos., and annealing the flakes produced at 670-780 deg.C to give the desired ratio of hard- to soft magnetic phases. Pref. an alloy of compsn. RExFeyBzSiuTv is used as the magnetic material, where RE is one or more rare earth metals and/or Y, Zr and Hf, and T is one or more transition metal with a body-centred cubic structure, and where x is not greater than 10 atom %, y is not greater than 85 atom %, z is not greater than 25 atom %, u is not greater than 10 atom %, and v is not greater than 10 atom %. Up to 10 atom % Fe may be replaced by Ni and/or Co. The soft magnetic phases comprises alpha-Fe and Fe3B, and the hard magnetic phase comprises Nd2Fe14B.

公开(公告)号：DE3600624A1

公开(公告)日：1987-07-16

申请号：DE3600624

申请日：1986-01-11

Applicant: BASF AG

Inventor： STECK WERNER DR ,  MAROSI LASZLO DR ,  HABERKORN HERBERT DR ,  FESER RAINER DR ,  HUEBNER WERNER ,  JAKUSCH HELMUT DR

IPC: G11B5/706 ,  C01G37/027 ,  B05D5/12

Abstract: The invention relates to a process for stabilizing acicular (needle-shaped) ferromagnetic chromium dioxide by treatment with alkali metal hydroxides in aqueous alkaline suspension at elevated temperature.

公开(公告)号：DE3536116A1

公开(公告)日：1987-04-16

申请号：DE3536116

申请日：1985-10-10

Applicant: BASF AG

Inventor： STECK WERNER DR ,  MAROSI LASZLO DR ,  HABERKORN HERBERT DR ,  FESER RAINER DR ,  HUEBNER WERNER ,  JAKUSCH HELMUT DR

IPC: H01F1/11 ,  C01G37/027 ,  G11B5/706 ,  G11B5/84

Abstract: The invention relates to a process for stabilising acicular (needle-shaped) ferromagnetic chromium dioxide by treatment with alkali metal hydroxides in an aqueous alkaline suspension at elevated temperature.

公开(公告)号：DE3416988A1

公开(公告)日：1985-11-14

申请号：DE3416988

申请日：1984-05-09

Applicant: BASF AG

Inventor： HIBST HARTMUT DR ,  JAKUSCH HELMUT DR

IPC: B22F9/22 ,  B22F9/26 ,  C01G49/00 ,  G11B5/706 ,  H01F1/11 ,  B22F9/16 ,  C01G51/00

Abstract: Finely divided ferrite powder of the general formula CoxFe3-xO4.5-0.5 x where x is from greater than zero to one, having an essentially isotropic particle shape, is prepared by oxidation of ferrite powder of the composition CoxFe3-xO4, where x has the same limits, with an oxygen-containing gas at from 150 DEG to 500 DEG C.