JPS5613411A - Manufacture of magnetic powder of metallic iron - Google Patents

Manufacture of magnetic powder of metallic iron

Info

Publication number
JPS5613411A
JPS5613411A JP8931479A JP8931479A JPS5613411A JP S5613411 A JPS5613411 A JP S5613411A JP 8931479 A JP8931479 A JP 8931479A JP 8931479 A JP8931479 A JP 8931479A JP S5613411 A JPS5613411 A JP S5613411A
Authority
JP
Japan
Prior art keywords
manufacture
magnetic powder
metallic iron
needle
raw material
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.)
Pending
Application number
JP8931479A
Other languages
Japanese (ja)
Inventor
Keizou Okuno
Keizo Nakamoto
Izumi Hoshihara
Takao Takahashi
Shojiro Ito
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.)
JFE Steel Corp
Kawatetsu Kagaku KK
Original Assignee
Kawasaki Steel Corp
Kawatetsu Kagaku 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 Kawasaki Steel Corp, Kawatetsu Kagaku KK filed Critical Kawasaki Steel Corp
Priority to JP8931479A priority Critical patent/JPS5613411A/en
Publication of JPS5613411A publication Critical patent/JPS5613411A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To manufacture magnetic powder of metallic iron efficiently with improved productivity, by coating the surface of raw material particles with a specific amount of specific substance such as alumina sol in the manufacture of magnetic powder of metallic iron by the gaseous phase reduction of needle-shaped iron oxyhydroxide.
CONSTITUTION: In the manufacture of magnetic powder described in the title by heating and reducing needle-shaped iron oxyhydroxide or needle-shaped iron oxide in reducing gas atmosphere, the surface of raw material particles is coated with uniform colloidal soln. using one or more members among specific substances such as alumina sol, colloidal silica, and polysilicate in an amount 0.1W10wt% of iron atom, then the raw material is reduced by heatint it in reducing gas atmosphere such as H2 etc. The coating material softens during reduction and coats the surface of the particles uniformly, whereby sintering is prevented. This method makes possible the heat treatment at a high temp. and in a short time so as to increase the productivity, and permits to manufacture magnetic powder of metallic iron having improved magnetic characteristics.
COPYRIGHT: (C)1981,JPO&Japio
JP8931479A 1979-07-16 1979-07-16 Manufacture of magnetic powder of metallic iron Pending JPS5613411A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8931479A JPS5613411A (en) 1979-07-16 1979-07-16 Manufacture of magnetic powder of metallic iron

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8931479A JPS5613411A (en) 1979-07-16 1979-07-16 Manufacture of magnetic powder of metallic iron

Publications (1)

Publication Number Publication Date
JPS5613411A true JPS5613411A (en) 1981-02-09

Family

ID=13967197

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8931479A Pending JPS5613411A (en) 1979-07-16 1979-07-16 Manufacture of magnetic powder of metallic iron

Country Status (1)

Country Link
JP (1) JPS5613411A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56114833A (en) * 1980-02-08 1981-09-09 Mitsui Toatsu Chem Inc Production of fine particle of iron compound for magnetic recording
JPS575805A (en) * 1980-06-11 1982-01-12 Hitachi Maxell Ltd Preparation of magnetic metal powder
JPS5846607A (en) * 1981-09-14 1983-03-18 Dainippon Ink & Chem Inc Manufacture of magnetic metal powder
JPS6367705A (en) * 1986-09-09 1988-03-26 Nissan Chem Ind Ltd Manufacture of magnetic iron powder
JPH0496052A (en) * 1990-08-13 1992-03-27 Fuji Photo Film Co Ltd Silver halide photographic sensitive material

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56114833A (en) * 1980-02-08 1981-09-09 Mitsui Toatsu Chem Inc Production of fine particle of iron compound for magnetic recording
JPS6313934B2 (en) * 1980-02-08 1988-03-28 Mitsui Toatsu Chemicals
JPS575805A (en) * 1980-06-11 1982-01-12 Hitachi Maxell Ltd Preparation of magnetic metal powder
JPS5846607A (en) * 1981-09-14 1983-03-18 Dainippon Ink & Chem Inc Manufacture of magnetic metal powder
JPH0122968B2 (en) * 1981-09-14 1989-04-28 Dainippon Inki Kagaku Kogyo Kk
JPS6367705A (en) * 1986-09-09 1988-03-26 Nissan Chem Ind Ltd Manufacture of magnetic iron powder
JPH0496052A (en) * 1990-08-13 1992-03-27 Fuji Photo Film Co Ltd Silver halide photographic sensitive material

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