DE1138750B - Process for the production of magnetizable iron oxides - Google Patents

Process for the production of magnetizable iron oxides

Info

Publication number
DE1138750B
DE1138750B DEB3948A DEB0003948A DE1138750B DE 1138750 B DE1138750 B DE 1138750B DE B3948 A DEB3948 A DE B3948A DE B0003948 A DEB0003948 A DE B0003948A DE 1138750 B DE1138750 B DE 1138750B
Authority
DE
Germany
Prior art keywords
ferric oxide
production
iron oxides
magnetizable iron
magnetizable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
DEB3948A
Other languages
German (de)
Other versions
DE1138750C2 (en
Inventor
Dr Friedrich Bergmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
BASF SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BASF SE filed Critical BASF SE
Priority to DEB3948A priority Critical patent/DE1138750B/en
Publication of DE1138750B publication Critical patent/DE1138750B/en
Application granted granted Critical
Publication of DE1138750C2 publication Critical patent/DE1138750C2/de
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G11B5/706—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material
    • G11B5/70626—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances
    • G11B5/70642—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances iron oxides
    • G11B5/70652—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances iron oxides gamma - Fe2 O3
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G49/00—Compounds of iron
    • C01G49/02—Oxides; Hydroxides
    • C01G49/06—Ferric oxide (Fe2O3)
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G11B5/706—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material
    • G11B5/70626—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances
    • G11B5/70642—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances iron oxides
    • G11B5/70647—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances iron oxides with a skin
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/42—Magnetic properties

Description

Verfahren zur Herstellung magnetisierbarer Eisenoxyde Magnetisierbare Eisenoxyde für Magnetogrammträger lassen sich dadurch herstellen, daß man Ferrioxyd mit reduzierenden Gasen in der Hitze behandelt und dann einer Oxydation zu y-Ferrioxyd unterwirft. Durch diese Maßnahmen läßt sich beispielsweise aus nichtmagnetischem a-Ferrioxyd ein Oxyd gewinnen, das zufolge seiner guten magnetischen Eigenschaften, insbesondere seiner Koerzitivkraft und Remanenz, für den genannten Zweck sehr gut geeignet ist.Process for the production of magnetizable iron oxides Magnetizable Iron oxides for magnetogram carriers can be produced by using ferric oxide treated with reducing gases in the heat and then an oxidation to y-ferric oxide subject. These measures can be used, for example, from non-magnetic a-ferric oxide win an oxide which, due to its good magnetic properties, especially its coercive force and remanence, very good for the stated purpose suitable is.

Es wurde nun gefunden, daß sich das Verfahren auch mit Vorteil auf ein y-Ferrioxyd anwenden läßt, das ,zwar magnetisch ist, aber keine befriedigenden Eigenschaften für den genannten Zweck aufweist, wenn man ein solches y-Ferrioxyd zunächst durch Erhitzen auf Temperaturen zwischen etwa 400 und 700° C in a-Ferrioxyd überführt. Die Wahl der Temperatur innerhalb dieses Bereiches richtet sich nach dem Reinheitsgrad des verwendeten y-Ferrioxyds; ein unreineres Oxyd erfordert höhere Temperaturen als ein reineres.It has now been found that the method is also advantageous a y-ferric oxide can be used, which is magnetic, but not satisfactory Has properties for the stated purpose, if one such γ-ferric oxide first by heating to temperatures between about 400 and 700 ° C in a-ferric oxide convicted. The choice of temperature within this range depends on the degree of purity of the γ-ferric oxide used; a more impure oxide requires higher ones Temperatures than a purer one.

Beispiel Ein wegen ungenügender magnetischer Eigenschaften zur Herstellung von Magnetogrammträgem schlecht geeignetes y-Ferrioxyd wird in einem Ofen unter Luftzutritt auf 500° C erhitzt. Sodann wird es einer reduzierenden Behandlung unterworfen, indem man etwa 8 Stunden lang einen Wasserstoffstrom bei 350° C darüberleitet. Man läßt den Ofen auf etwa 150' C abkühlen, spült ihn mit Stickstoff und leitet nun bei dieser Temperatur 8 Stunden lang einen Luftstrom hindurch. Nach dieser Behandlung hat die Koerzitivkraft des y-Ferrioxyds um etwa das 3,5fache und die Remanenz um etwa das 1,6fache zugenommen. Unterläßt man die Vorbehandlung durch Erhitzen auf 500' C, so führt die Reduktion und Oxydation unter denselben Bedingungen nur zu einer Erhöhung der Koerzitivkraft auf etwa das Doppelte, während die Remanenz sich nicht verändert.Example One because of insufficient magnetic properties for production γ-ferric oxide, which is poorly suited for magnetogram carriers, is placed in an oven under Access to air heated to 500 ° C. It is then subjected to a reducing treatment, by passing a stream of hydrogen over it at 350 ° C for about 8 hours. Man lets the oven cool down to about 150 ° C., flushes it with nitrogen and now conducts a stream of air therethrough at this temperature for 8 hours. After this treatment has the coercive force of y-ferric oxide around 3.5 times and the remanence around increased about 1.6 times. If the pretreatment by heating is omitted 500 ° C, the reduction and oxidation under the same conditions only lead to an increase in the coercive force to about double, while the remanence increases not changed.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung magnetisierbarer Eisenoxyde für Magnetogrammträger durch Behandlung von Ferrioxyd mit reduzierenden Gasen in der Hitze und nachträgliche Oxydation zu y-Ferrioxyd, dadurch gekennzeichnet, daß man y-Ferrioxyd mit ungenügenden magnetischen Eigenschäften durch Erhitzen auf Temperaturen zwischen etwa 400 und 700' C in a-Ferrioxyd überführt und dieses der reduzierenden und oxydierenden Behandlung unterwirft.PATENT CLAIM: Process for the production of magnetizable iron oxides for magnetogram carriers by treating ferric oxide with reducing gases in the heat and subsequent oxidation to y-ferric oxide, characterized in that y-ferric oxide with insufficient magnetic properties by heating to temperatures between about 400 and 700 ° C converted into a-ferric oxide and this the reducing and subjected to oxidative treatment.
DEB3948A 1950-05-26 1950-05-26 Process for the production of magnetizable iron oxides Granted DE1138750B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEB3948A DE1138750B (en) 1950-05-26 1950-05-26 Process for the production of magnetizable iron oxides

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB3948A DE1138750B (en) 1950-05-26 1950-05-26 Process for the production of magnetizable iron oxides

Publications (2)

Publication Number Publication Date
DE1138750B true DE1138750B (en) 1962-10-31
DE1138750C2 DE1138750C2 (en) 1963-05-16

Family

ID=6953474

Family Applications (1)

Application Number Title Priority Date Filing Date
DEB3948A Granted DE1138750B (en) 1950-05-26 1950-05-26 Process for the production of magnetizable iron oxides

Country Status (1)

Country Link
DE (1) DE1138750B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3974079A (en) * 1971-05-06 1976-08-10 Bayer Aktiengesellschaft Production of gamma iron oxide
US4213959A (en) * 1977-08-05 1980-07-22 Basf Aktiengesellschaft Manufacture of acicular, ferrimagnetic iron oxide

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3974079A (en) * 1971-05-06 1976-08-10 Bayer Aktiengesellschaft Production of gamma iron oxide
US4213959A (en) * 1977-08-05 1980-07-22 Basf Aktiengesellschaft Manufacture of acicular, ferrimagnetic iron oxide

Also Published As

Publication number Publication date
DE1138750C2 (en) 1963-05-16

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