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公开(公告)号:JPS62226818A
公开(公告)日:1987-10-05
申请号:JP24565886
申请日:1986-10-17
Applicant: BASF AG
Inventor: MUELLER NORBERT , BOETTCHER BERNHARD , OHLINGER MANFRED , REINICKE HELMUT , HONECKER GERHARD
IPC: H01F1/11 , C01G37/02 , C01G37/027 , G11B5/706 , H01F1/10
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公开(公告)号:DE3775801D1
公开(公告)日:1992-02-20
申请号:DE3775801
申请日:1987-03-25
Applicant: BASF AG
Inventor: MUELLER NORBERT , OHLINGER MANFRED , WALTER EGON
IPC: C01G37/027 , G11B5/706
Abstract: Ferromagnetic CrO2 (I) is produced by mixing Cr2O3 and CrO3 in water, with addn. of modifier(s) (II), and then heating the mixt. at 240-500 deg. C and 100-700 bar. (II) is added in a predetermined amt. of a dust-tight package, made of material which is soluble or disintegrates in water.
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公开(公告)号:GB2000295B
公开(公告)日:1982-03-10
申请号:GB7826625
申请日:1978-06-09
Applicant: BASF AG
Inventor: HAMMON FRITZ , OHLINGER MANFRED , HARTMANN JOB-WERNER
Abstract: In order to determine the homogeneity of a magnetic dispersion, part of the dispersion is conducted through a measuring cell prior to its application to a base, the size, number and type of those regions of the magnetic dispersion which interfere with the homogeneity being determined with the aid of magnetic measurements. The measuring cell contains a magnetic head, a magnetic dispersion is made to flow in a stream of constant cross section past the air gap of the magnetic head, and a magnetic field at least partially penetrating the magnetic dispersion is produced. From the characteristics of the amplified output voltage of the magnetic head the various parameters of the inhomogeneities in the magnetic dispersion can then be ascertained.
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公开(公告)号:ZA855953B
公开(公告)日:1986-04-30
申请号:ZA855953
申请日:1985-08-07
Applicant: BASF AG
Inventor: OHLINGER MANFRED , MUELLER NORBERT , PETER RUDOLF , WETTSTEIN EUGEN
Abstract: Ferromagnetic chromium dioxide is prepared by converting oxides of trivalent and hexavalent chromium under superatmospheric pressure and at elevated temperatures in the presence of water and with the addition of an antimony compound as a modifier and, if required, further additives in an amount of not more than 15% by weight, by a method in which the antimony compound is present in the form of a water-soluble salt whose anion contains one or more organic molecular moieties which are oxidized in concentrated chromic acid.
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公开(公告)号:DE3680905D1
公开(公告)日:1991-09-19
申请号:DE3680905
申请日:1986-10-18
Applicant: BASF AG
Inventor: MUELLER NORBERT , BOETTCHER BERNHARD , OHLINGER MANFRED , REINICKE HELMUT , HONECKER GERHARD
IPC: H01F1/11 , C01G37/02 , C01G37/027 , G11B5/706 , H01F1/10
Abstract: Prodn. of Cr2O3 is effected by thermal decompsn. of hydrous NH4 bichromate (I) at 450-750 deg.C in a restricted combustion chamber such that the ratio of the vol. of the combustion chamber in l, to the flow rate of (I) in kg/min. is 1-6:1. Pref. decompsn. is effected in a combustion chamber attached to the feed inlet of a rotary furnace, the material emerging from the combustion chamber being post-reacted in the furnace at sub-decompsn. temp. before being discharged from the other end. The combustion chamber has a dia./length ratio of 1:2 2:1. The ratio of the dia. of the combustion chamber to the dia. of the furnace is 1-3:4.
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公开(公告)号:CA1269234A
公开(公告)日:1990-05-22
申请号:CA488306
申请日:1985-08-08
Applicant: BASF AG
Inventor: OHLINGER MANFRED , MUELLER NORBERT , RUDOLF PETER , WETTSTEIN EUGEN
Abstract: The invention relates to a process for the preparation of a ferromagnetic chromium dioxide by converting oxides of trivalent and hexavalent chromium under a pressure of from 100 to 700 bar and at a temperature of from 200.degree. to 600.degree.C in the presence of water, an antimony modifier and acicular iron oxide particles or acicular iron particles in an amount of not more than 15% by weight comprising adding an antimony compound as a modifier in the form of a water-soluble salt in an amount of at least 0.1% by weight but less than 4% by weight, based on the resulting chromium dioxide and said iron oxide or iron particles to a mixture of hexavalent chromium oxide and water, adding trivalent chromium oxide thereto and subjecting the resultant mixture to said pressure and temperature, with a proviso that the water-soluble antimony compound contains at least one organic molecular moiety anion which is oxidized by the oxide of hexavalent chromium with the evolution of gas when said antimony compound is added to a mixture of said hexavalent chromium oxide and water. This process allows the preparation of ferromagnetic chromium dioxides having a high coercive force while at the same time reducing the amount of modifiers required for this purpose.
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公开(公告)号:DE3609971A1
公开(公告)日:1987-10-01
申请号:DE3609971
申请日:1986-03-25
Applicant: BASF AG
Inventor: MUELLER NORBERT , BOETTCHER BERNHARD , OHLINGER MANFRED , REINICKE HELMUT , HONECKER GERHARD
Abstract: A process for the preparation of chromium(III) oxide by decomposing hydrated ammonium dichromate at elevated temperatures, an apparatus for carrying out this process and the use of the chromium(III) oxide thus prepared as a starting material for the synthesis of chromium dioxide.
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公开(公告)号:CA1204723A
公开(公告)日:1986-05-20
申请号:CA435169
申请日:1983-08-23
Applicant: BASF AG
Inventor: FRANK GERHARD , RUDOLF PETER , NEUBAUER GERALD , OHLINGER MANFRED , WILFINGER HANS J , PFANNEBECKER EMIL , DUFFNER PAUL
IPC: B01J23/74
Abstract: Molded iron catalysts which contain metallic iron particles, obtained from anisometric iron oxide particles by contact with hydrogen at ? 500.degree.C, and a lubricant, are prepared.
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公开(公告)号:DE3610192A1
公开(公告)日:1987-10-01
申请号:DE3610192
申请日:1986-03-26
Applicant: BASF AG
Inventor: MUELLER NORBERT , OHLINGER MANFRED , WALTER EGON
IPC: C01G37/027 , G11B5/706 , C01G37/033
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公开(公告)号:AU4594185A
公开(公告)日:1986-10-23
申请号:AU4594185
申请日:1985-08-08
Applicant: BASF AG
Inventor: OHLINGER MANFRED , MUELLER NORBERT , PETER RUDOLF , WETTSTEIN EUGEN
IPC: F27B7/28 , F27D1/00 , C01G37/027
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