JPS5613411A - Manufacture of magnetic powder of metallic iron - Google Patents
Manufacture of magnetic powder of metallic ironInfo
- 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
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
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)
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 |
-
1979
- 1979-07-16 JP JP8931479A patent/JPS5613411A/en active Pending
Cited By (7)
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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