JPS5723003A - Manufacture of magnetic metal powder - Google Patents
Manufacture of magnetic metal powderInfo
- Publication number
- JPS5723003A JPS5723003A JP9540380A JP9540380A JPS5723003A JP S5723003 A JPS5723003 A JP S5723003A JP 9540380 A JP9540380 A JP 9540380A JP 9540380 A JP9540380 A JP 9540380A JP S5723003 A JPS5723003 A JP S5723003A
- Authority
- JP
- Japan
- Prior art keywords
- compound
- layer containing
- suspension
- iron hydroxide
- coated
- 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
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 improve the characteristics of a magnetic powder composed primarily of metallic iron to be manufactured by a method in which Ni(OH)2 is added to a ferrous hydroxide suspension as a raw material and also the surfaces of iron hydroxide formed are coated with a layer containing one of an Al compound and a Zn compound and an Si compound.
CONSTITUTION: To an alkaline suspension of Fe(OH)2, whose pH is regulated to 11 or more, Ni(OH)2 is added in a Ni/Fe ratio of 0.001W0.15 and then oxygen- containing gas, e.g., air, is introduced into the suspension to precipitate alpha-Fe oxyhydroxide. Then, the surfaces of the iron hydroxide particles as such or after being baked are coated with a layer containing 0.01W10wt%[(Al+Zn/Fe)] sulfates or nitrates of Al and Zn and then with a layer containing 0.1W10wt%(Si/Fe) a water-soluble silicate. The iron hydroxide pariticles thus obtained are washed with water, dried, and then heated in a reductive atmosphere for reduction to obtain a densed granular metal magnetic powder having an uniform grain size.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55095403A JPS5932523B2 (en) | 1980-07-11 | 1980-07-11 | Manufacturing method of metal magnetic powder |
DE8181104423T DE3176436D1 (en) | 1980-06-11 | 1981-06-10 | Process for preparing ferromagnetic particles comprising metallic iron |
EP81104423A EP0041727B1 (en) | 1980-06-11 | 1981-06-10 | Process for preparing ferromagnetic particles comprising metallic iron |
US06/272,722 US4390361A (en) | 1980-06-11 | 1981-06-11 | Process for preparing ferromagnetic particles comprising metallic iron |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55095403A JPS5932523B2 (en) | 1980-07-11 | 1980-07-11 | Manufacturing method of metal magnetic powder |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5723003A true JPS5723003A (en) | 1982-02-06 |
JPS5932523B2 JPS5932523B2 (en) | 1984-08-09 |
Family
ID=14136695
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55095403A Expired JPS5932523B2 (en) | 1980-06-11 | 1980-07-11 | Manufacturing method of metal magnetic powder |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5932523B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62219326A (en) * | 1986-03-20 | 1987-09-26 | Hitachi Maxell Ltd | Magnetic recording medium |
JPH04192116A (en) * | 1990-11-27 | 1992-07-10 | Fuji Photo Film Co Ltd | Magnetic material with improved transparency |
CN111902869A (en) * | 2018-03-30 | 2020-11-06 | 索尼公司 | Method for producing magnetic powder and method for producing magnetic recording medium |
-
1980
- 1980-07-11 JP JP55095403A patent/JPS5932523B2/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62219326A (en) * | 1986-03-20 | 1987-09-26 | Hitachi Maxell Ltd | Magnetic recording medium |
JPH04192116A (en) * | 1990-11-27 | 1992-07-10 | Fuji Photo Film Co Ltd | Magnetic material with improved transparency |
JP2670901B2 (en) * | 1990-11-27 | 1997-10-29 | 富士写真フイルム株式会社 | Magnetic materials with improved transparency |
CN111902869A (en) * | 2018-03-30 | 2020-11-06 | 索尼公司 | Method for producing magnetic powder and method for producing magnetic recording medium |
Also Published As
Publication number | Publication date |
---|---|
JPS5932523B2 (en) | 1984-08-09 |
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