JPS5565304A - Production of metal magnetic powder - Google Patents
Production of metal magnetic powderInfo
- Publication number
- JPS5565304A JPS5565304A JP13884078A JP13884078A JPS5565304A JP S5565304 A JPS5565304 A JP S5565304A JP 13884078 A JP13884078 A JP 13884078A JP 13884078 A JP13884078 A JP 13884078A JP S5565304 A JPS5565304 A JP S5565304A
- Authority
- JP
- Japan
- Prior art keywords
- reduction
- reduced pressure
- pressure
- reducing gas
- reduced
- 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
- 239000002184 metal Substances 0.000 title abstract 3
- 229910052751 metal Inorganic materials 0.000 title abstract 3
- 239000006247 magnetic powder Substances 0.000 title 1
- 238000006722 reduction reaction Methods 0.000 abstract 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 4
- 239000000843 powder Substances 0.000 abstract 4
- 238000006243 chemical reaction Methods 0.000 abstract 2
- 229910052742 iron Inorganic materials 0.000 abstract 2
- 150000002736 metal compounds Chemical class 0.000 abstract 2
- 230000001590 oxidative effect Effects 0.000 abstract 2
- 238000007664 blowing Methods 0.000 abstract 1
- 238000001035 drying Methods 0.000 abstract 1
- 230000005294 ferromagnetic effect Effects 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 abstract 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract 1
- 230000003647 oxidation Effects 0.000 abstract 1
- 238000007254 oxidation reaction Methods 0.000 abstract 1
- 230000035945 sensitivity Effects 0.000 abstract 1
Landscapes
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Powder Metallurgy (AREA)
- Hard Magnetic Materials (AREA)
Abstract
PURPOSE: To produce the ferromagnetic metal powder of high sensitivity which is suited for high-density recording media by reducing the metal compound powder composed primarily of iron with a reducing gas after heating and drying under vacuum, or interrupting reduction reaction and repeating pressure reduction-reduction then letting oxide films form with oxidative gas.
CONSTITUTION: The metal compound powder which is composed primarily of iron as represented by maghemite and magnetite is charged into a reduced pressure reaction furnace and is heated to dry under reduced pressure after which it is reduced by being contacted with reducing gas as represented by H2 and Co. It is also equanlly well to repeat blowing of the reducing gas with intervention of pressure- reduction operation by a number of times. These enable the sure releasing of residual moisture contents and the increase in reduction reaction efficiency to be achieved. After ending of the reduction reaction, the reaction furnace is brought to a reduced pressure and a small amount of oxidative gas is blown into the surface, by which the metal powder surfaces having been reduced are covered with oxide films so that the subsequent oxidation may be sufficiently suppressed.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13884078A JPS5565304A (en) | 1978-11-13 | 1978-11-13 | Production of metal magnetic powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13884078A JPS5565304A (en) | 1978-11-13 | 1978-11-13 | Production of metal magnetic powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5565304A true JPS5565304A (en) | 1980-05-16 |
Family
ID=15231422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13884078A Pending JPS5565304A (en) | 1978-11-13 | 1978-11-13 | Production of metal magnetic powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5565304A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60124023A (en) * | 1983-12-07 | 1985-07-02 | Daikin Ind Ltd | Magnetic recording medium |
| JPH0374809A (en) * | 1989-08-15 | 1991-03-29 | Fuji Photo Film Co Ltd | Processing method of ferromagnetic metal powder and magnetic recording medium |
-
1978
- 1978-11-13 JP JP13884078A patent/JPS5565304A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60124023A (en) * | 1983-12-07 | 1985-07-02 | Daikin Ind Ltd | Magnetic recording medium |
| JPH0374809A (en) * | 1989-08-15 | 1991-03-29 | Fuji Photo Film Co Ltd | Processing method of ferromagnetic metal powder and magnetic recording medium |
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