JPS643021A - Barium ferrite magnetic powder and production thereof - Google Patents

Barium ferrite magnetic powder and production thereof

Info

Publication number
JPS643021A
JPS643021A JP2173687A JP2173687A JPS643021A JP S643021 A JPS643021 A JP S643021A JP 2173687 A JP2173687 A JP 2173687A JP 2173687 A JP2173687 A JP 2173687A JP S643021 A JPS643021 A JP S643021A
Authority
JP
Japan
Prior art keywords
precipitate
magnetic powder
raw material
water
flux
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
JP2173687A
Other languages
Japanese (ja)
Other versions
JPH0647467B2 (en
JPH013021A (en
Inventor
Kyoji Odan
Takayuki Kimura
Kazuo Hashimoto
Akira Satake
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.)
Ube Corp
Original Assignee
Ube Industries Ltd
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 Ube Industries Ltd filed Critical Ube Industries Ltd
Priority to JP2173687A priority Critical patent/JPH0647467B2/en
Publication of JPS643021A publication Critical patent/JPS643021A/en
Publication of JPH013021A publication Critical patent/JPH013021A/en
Publication of JPH0647467B2 publication Critical patent/JPH0647467B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Compounds Of Iron (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

PURPOSE: To obtain the titled magnetic powder having sharp particle size distribution and excellent coercive force and suitable as a magnetic recording medium for high-density recording, by using a starting material composed of compounds of Ba, Fe, Co and Zn at prescribed ratios, dissolving the raw material in water, adding an alkali metal hydroxide to the solution, subjecting to hydrothermal treatment, mixing a flux to the obtained precipitate and baking the mixture.
CONSTITUTION: A starting raw material is produced by mixing compounds of Ba, Fe, Co and Zn at gram-atom ratios of Ba/Fe=1/1W12, Fe/Co=12-x-y/x and Fe/Zn=12-x-y/y. The raw material is dissolved in water and an alkali metal hydroxide is added to the solution in an amount to attain a concentration of ≥3mol./l to obtain a precipitate. A slurry containing the precipitate is subjected to hydrothermal treatment at 130W300°C for 0.5W20hr. The obtained precipitate of fine crystals is washed with water, mixed with 10W80wt.% (based on dried precipitate) of a flux (e.g. NaCl), baked at 700W950°C for 10minW30hr, washed and dried to obtain the titled magnetic powder having a hexagonal magnetoplumbite plate crystal of formula (n is 0.8W1.0; x is 0.1W1.5; y is 0.1W1.5), a specific surface area of 20W70m2/g, a coercive force of 200W15,000e and a plate ratio of 2W15.
COPYRIGHT: (C)1989,JPO&Japio
JP2173687A 1986-11-28 1987-02-03 Barium ferrite magnetic powder and method for producing the same Expired - Lifetime JPH0647467B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2173687A JPH0647467B2 (en) 1986-11-28 1987-02-03 Barium ferrite magnetic powder and method for producing the same

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP28192886 1986-11-28
JP61-281928 1986-11-28
JP2173687A JPH0647467B2 (en) 1986-11-28 1987-02-03 Barium ferrite magnetic powder and method for producing the same

Publications (3)

Publication Number Publication Date
JPS643021A true JPS643021A (en) 1989-01-06
JPH013021A JPH013021A (en) 1989-01-06
JPH0647467B2 JPH0647467B2 (en) 1994-06-22

Family

ID=26358825

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2173687A Expired - Lifetime JPH0647467B2 (en) 1986-11-28 1987-02-03 Barium ferrite magnetic powder and method for producing the same

Country Status (1)

Country Link
JP (1) JPH0647467B2 (en)

Also Published As

Publication number Publication date
JPH0647467B2 (en) 1994-06-22

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