JPS5571632A - Production of ferromagnetic powder - Google Patents

Production of ferromagnetic powder

Info

Publication number
JPS5571632A
JPS5571632A JP14587778A JP14587778A JPS5571632A JP S5571632 A JPS5571632 A JP S5571632A JP 14587778 A JP14587778 A JP 14587778A JP 14587778 A JP14587778 A JP 14587778A JP S5571632 A JPS5571632 A JP S5571632A
Authority
JP
Japan
Prior art keywords
cobalt
dispersion
alcohol
iron oxide
powder
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
JP14587778A
Other languages
Japanese (ja)
Other versions
JPS6242859B2 (en
Inventor
Toshinobu Sueyoshi
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.)
Maxell Holdings Ltd
Original Assignee
Hitachi Maxell 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 Hitachi Maxell Ltd filed Critical Hitachi Maxell Ltd
Priority to JP14587778A priority Critical patent/JPS5571632A/en
Publication of JPS5571632A publication Critical patent/JPS5571632A/en
Publication of JPS6242859B2 publication Critical patent/JPS6242859B2/ja
Granted legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To obtain cobalt-contg. iron oxide ferromagnetic powder having a narrow coercive force distribution by mixing a dispersion of iron oxide magnetic powder and a cobalt salt in an alcohol and an aq. alkali soln. and treating the mixt. at a temp. below the b.p.
CONSTITUTION: A cobalt salt such as cobalt chloride or cobalt sulfate is dissolved in an alcohol having compatibility with water, e.g. methanol or ethylene glycol. Iron oxide magnetic powder such as γ-Fe2O3 or partially reduced γ-Fe2O3 is added to form a dispersion of the powder in the alcohol. This dispersion is then mixed with an aq. alkali soln. contg. alkali in an amt. of an equivalent or more to the cobalt salt, and the mixt. is treated at a temp. below the b.p. for an adequate time.
COPYRIGHT: (C)1980,JPO&Japio
JP14587778A 1978-11-25 1978-11-25 Production of ferromagnetic powder Granted JPS5571632A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14587778A JPS5571632A (en) 1978-11-25 1978-11-25 Production of ferromagnetic powder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14587778A JPS5571632A (en) 1978-11-25 1978-11-25 Production of ferromagnetic powder

Publications (2)

Publication Number Publication Date
JPS5571632A true JPS5571632A (en) 1980-05-29
JPS6242859B2 JPS6242859B2 (en) 1987-09-10

Family

ID=15395105

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14587778A Granted JPS5571632A (en) 1978-11-25 1978-11-25 Production of ferromagnetic powder

Country Status (1)

Country Link
JP (1) JPS5571632A (en)

Also Published As

Publication number Publication date
JPS6242859B2 (en) 1987-09-10

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