JPS5745206A - Manufacture of acicular powder of magnetic iron oxide covered with cobalt - Google Patents

Manufacture of acicular powder of magnetic iron oxide covered with cobalt

Info

Publication number
JPS5745206A
JPS5745206A JP55119026A JP11902680A JPS5745206A JP S5745206 A JPS5745206 A JP S5745206A JP 55119026 A JP55119026 A JP 55119026A JP 11902680 A JP11902680 A JP 11902680A JP S5745206 A JPS5745206 A JP S5745206A
Authority
JP
Japan
Prior art keywords
cobalt
make
added
alkali
core crystals
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
JP55119026A
Other languages
Japanese (ja)
Other versions
JPH0227804B2 (en
Inventor
Jihei Senda
Soichi Miyamoto
Hideaki Tokunaga
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.)
CHITAN KOGYO KK
Titan Kogyo KK
Original Assignee
CHITAN KOGYO KK
Titan Kogyo KK
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 CHITAN KOGYO KK, Titan Kogyo KK filed Critical CHITAN KOGYO KK
Priority to JP55119026A priority Critical patent/JPS5745206A/en
Publication of JPS5745206A publication Critical patent/JPS5745206A/en
Publication of JPH0227804B2 publication Critical patent/JPH0227804B2/ja
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
    • G11B5/70647—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

Abstract

PURPOSE:To enhance holding power, etc., by a method wherein after alkali is added to a mixed solution to obtain a pH necessary to make iron hydroxide and cobalt hydroxide to be precipitated, it is made to form a uniform colloid solution by adding dilute sulfuric acid, and alkali is added again to make colloid nuclei to grow. CONSTITUTION:The mixed solution of iron and cobalt is made using iron salt and cobalt salt, and acicular core crystals of ferromagnetic iron oxide powder is added and stirred to make the core crystals to be dispersed. Alkali, such as caustic soda, etc., is added to obtain the pH of 12- 13 necessary to make iron hydroxide and cobalt hydroxide to be precipitated, and then pH is made to descend to 3-5 by adding dilute acid, such as dilute sulfuric acid, etc., to convert the precipitation into a uniform colloid solution to make it as nuclei to induce uniform cobalt ferrite, etc., moreover alkali sufficient to make the nuclei to grow is added, heat of the grade not to make cobalt to disperse inside of the core crystals is applied and is stirred, and cobalt compound, etc., are made to be deposited uniformly to the core crystals and to cover the surface of the unit core crystals uniformly. Accordingly high holding power can be obtained and distribution of holding power can be improved remarkably.
JP55119026A 1980-08-30 1980-08-30 Manufacture of acicular powder of magnetic iron oxide covered with cobalt Granted JPS5745206A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55119026A JPS5745206A (en) 1980-08-30 1980-08-30 Manufacture of acicular powder of magnetic iron oxide covered with cobalt

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55119026A JPS5745206A (en) 1980-08-30 1980-08-30 Manufacture of acicular powder of magnetic iron oxide covered with cobalt

Publications (2)

Publication Number Publication Date
JPS5745206A true JPS5745206A (en) 1982-03-15
JPH0227804B2 JPH0227804B2 (en) 1990-06-20

Family

ID=14751138

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55119026A Granted JPS5745206A (en) 1980-08-30 1980-08-30 Manufacture of acicular powder of magnetic iron oxide covered with cobalt

Country Status (1)

Country Link
JP (1) JPS5745206A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5609789A (en) * 1992-12-29 1997-03-11 Ishihara Sangyo Kaisha, Ltd. Cobalt-containing magnetic iron oxide and process for producing the same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS525494A (en) * 1975-07-02 1977-01-17 Fuji Photo Film Co Ltd Ferromagnetic grit manufacturing process

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS525494A (en) * 1975-07-02 1977-01-17 Fuji Photo Film Co Ltd Ferromagnetic grit manufacturing process

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5609789A (en) * 1992-12-29 1997-03-11 Ishihara Sangyo Kaisha, Ltd. Cobalt-containing magnetic iron oxide and process for producing the same

Also Published As

Publication number Publication date
JPH0227804B2 (en) 1990-06-20

Similar Documents

Publication Publication Date Title
GB1436090A (en) Magnetic iron oxides with orientability and a process for their production
GB1060767A (en) Process for the preparation of -feooh
WO2004011387A1 (en) Method of producing ferrite magnet from layed precursor
GB721630A (en) Method for the production of ª†-fe o of improved magnetic properties
GB1441183A (en) Magnetic recording particles
JPS5745206A (en) Manufacture of acicular powder of magnetic iron oxide covered with cobalt
CN1297511C (en) Porous magnetic ferrite and its preparation method
JPS54151598A (en) Manufacture of plate iron oxide
DE1176111B (en) Process for the production of ferromagnetic ª † -FeO
GB759245A (en) Improvements in or relating to methods of manufacturing non-metallic magnetic cores having a substantially rectangular hysteresis loop
JPS5723002A (en) Manufacture of magnetic metal powder
JPS5475597A (en) Preparation of metal podwer for magnetic recording
JPS57124404A (en) Manufacture of magnetic iron oxide powder
JPS55162430A (en) Manufacture of ferromagnetic powder
JPS53128597A (en) Process for producing alpha ferric oxide
JPS55133505A (en) Manufacture of needle ferromagnetic metal particle powder for magnetic memory material
JPS6415309A (en) Production of metal fine powder
JPS57106527A (en) Manufacture of needlelike fine particle of iron oxyhydroxide
JPS5556605A (en) Magnetic recording medium
GB814180A (en) Mixed ferrites by a coprecipitation process
GB708460A (en) Improvements relating to magnetic cores for high frequency coils
GB645056A (en) Improved process of manufacturing magnetic material
JPH03271376A (en) White magnetic powder and its production
JPS5537404A (en) Production of ferric oxide pigment
CN104538624A (en) Preparation method of ferroferric oxide for iron nickel battery and application of ferroferric oxide