JPS56169708A - Manufacture of magnetic metal powder - Google Patents

Manufacture of magnetic metal powder

Info

Publication number
JPS56169708A
JPS56169708A JP7301480A JP7301480A JPS56169708A JP S56169708 A JPS56169708 A JP S56169708A JP 7301480 A JP7301480 A JP 7301480A JP 7301480 A JP7301480 A JP 7301480A JP S56169708 A JPS56169708 A JP S56169708A
Authority
JP
Japan
Prior art keywords
particles
suspension
aqueous solution
manufacture
blown
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
JP7301480A
Other languages
Japanese (ja)
Other versions
JPS5919166B2 (en
Inventor
Shigeo Hirai
Toshinobu Sueyoshi
Masahiro Amamiya
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 JP55073014A priority Critical patent/JPS5919166B2/en
Priority to EP81104141A priority patent/EP0041257B1/en
Priority to DE8181104141T priority patent/DE3167164D1/en
Publication of JPS56169708A publication Critical patent/JPS56169708A/en
Priority to US06/516,432 priority patent/US4456475A/en
Publication of JPS5919166B2 publication Critical patent/JPS5919166B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Paints Or Removers (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Magnetic Record Carriers (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

PURPOSE: To manufacture a metallic iron-based magnetic powder which has excellent denseness and magnetic characteristics as well as high breaking resistance during heat treatment by adding an alkaline earth metal hydroxide to ferrous hydroxide as a raw material.
CONSTITUTION: An aqueous solution containing FeSO4 and one of alkaline earth metal compounds, e.g., MgSO4, Ca(NO3)2, etc., is added with NaOH aqueous solution while stirring to form a suspension containing the coprecipitate of Fe(OH)2 and Mg(OH)2 or Ca(OH)2 and having pH11 or more. The suspension is then heated and an oxygen-containing gas, e.g., air, etc., is blown into the suspension to separate the needlelike particles of α-iron oxyhydroxide (α-FeOOH). The particles are filtered, washed with water, dried, and then dispersed into an Na4SiO4 aqueous solution. And, CO2 gas is blown into the suspension to form α-FeOOH particles whose surface is covered with deposited silicic acid sol. Then, the particles are filtered, washed with water, dried, and then reduced by hydrogen in an electric oven to manufacture magnetic metallic iron particles having adjustable axis ratio and grain size.
COPYRIGHT: (C)1981,JPO&Japio
JP55073014A 1980-05-30 1980-05-30 Manufacturing method of metal magnetic powder Expired JPS5919166B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP55073014A JPS5919166B2 (en) 1980-05-30 1980-05-30 Manufacturing method of metal magnetic powder
EP81104141A EP0041257B1 (en) 1980-05-30 1981-05-29 Process for preparing ferromagnetic particles comprising metallic iron
DE8181104141T DE3167164D1 (en) 1980-05-30 1981-05-29 Process for preparing ferromagnetic particles comprising metallic iron
US06/516,432 US4456475A (en) 1980-05-30 1983-07-25 Process for preparing ferromagnetic particles comprising metallic iron

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55073014A JPS5919166B2 (en) 1980-05-30 1980-05-30 Manufacturing method of metal magnetic powder

Publications (2)

Publication Number Publication Date
JPS56169708A true JPS56169708A (en) 1981-12-26
JPS5919166B2 JPS5919166B2 (en) 1984-05-02

Family

ID=13506048

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55073014A Expired JPS5919166B2 (en) 1980-05-30 1980-05-30 Manufacturing method of metal magnetic powder

Country Status (1)

Country Link
JP (1) JPS5919166B2 (en)

Also Published As

Publication number Publication date
JPS5919166B2 (en) 1984-05-02

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