JPS5572008A - Preparation of ferromagnetic powder - Google Patents

Preparation of ferromagnetic powder

Info

Publication number
JPS5572008A
JPS5572008A JP14587878A JP14587878A JPS5572008A JP S5572008 A JPS5572008 A JP S5572008A JP 14587878 A JP14587878 A JP 14587878A JP 14587878 A JP14587878 A JP 14587878A JP S5572008 A JPS5572008 A JP S5572008A
Authority
JP
Japan
Prior art keywords
powder
iron oxide
magnetic powder
dispersion
alcohol
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
JP14587878A
Other languages
Japanese (ja)
Other versions
JPS6151401B2 (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 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 JP14587878A priority Critical patent/JPS5572008A/en
Publication of JPS5572008A publication Critical patent/JPS5572008A/en
Publication of JPS6151401B2 publication Critical patent/JPS6151401B2/ja
Granted legal-status Critical Current

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  • Compounds Of Iron (AREA)
  • Paints Or Removers (AREA)
  • Magnetic Record Carriers (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

PURPOSE: To reduce dispersion in coercive force by forming layer of cobalt-containing iron oxide layer on magnetic iron oxide powder in an alcohol solvent.
CONSTITUTION: Cobalt chloride and ferrous chloride are dissolved into a water soluble alcohol such as polyethylene glycol. Acicular iron oxide is dispersed into the solution, and dispersed solution is added with an aqueous solution containing an equivalent or more of alkali. The dispersion is then mixed at a temperature below its boiling point and filtered to separate out the magnetic powder. In this process, the cobalt chloride and ferrous chloride dissolved in the alcohol are precipitated out by the added alkali and deposited on the iron oxide magnetic powder as Co(OH)2 and Fe(OH)2. The precipitated Co(OH)2 and Fe(OH)2 on the powder is allowed to have a better balance and more uniform distribution by the use of alcohol solvent than use of water. Further, an excellent powder dispersion assures uniformly distributed magnetic powder. Thus, uniform reaction is caused to occur, providing magnetic powder having narrower coercive force distribution.
COPYRIGHT: (C)1980,JPO&Japio
JP14587878A 1978-11-25 1978-11-25 Preparation of ferromagnetic powder Granted JPS5572008A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14587878A JPS5572008A (en) 1978-11-25 1978-11-25 Preparation of ferromagnetic powder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14587878A JPS5572008A (en) 1978-11-25 1978-11-25 Preparation of ferromagnetic powder

Publications (2)

Publication Number Publication Date
JPS5572008A true JPS5572008A (en) 1980-05-30
JPS6151401B2 JPS6151401B2 (en) 1986-11-08

Family

ID=15395129

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14587878A Granted JPS5572008A (en) 1978-11-25 1978-11-25 Preparation of ferromagnetic powder

Country Status (1)

Country Link
JP (1) JPS5572008A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02201073A (en) * 1989-01-31 1990-08-09 Toshiba Corp Fluid compressor
DE102017202628B4 (en) 2017-02-17 2022-03-17 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Method of encoding a plate-like workpiece, method of identifying a plate-like workpiece, radiation processing apparatus and coding system
JP2019189913A (en) 2018-04-26 2019-10-31 京浜ラムテック株式会社 Sputtering cathode, sputtering cathode assembly and sputtering apparatus

Also Published As

Publication number Publication date
JPS6151401B2 (en) 1986-11-08

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