JPS54162666A - Manufacture of needlelike magnetic alloy particle - Google Patents
Manufacture of needlelike magnetic alloy particleInfo
- Publication number
- JPS54162666A JPS54162666A JP7238178A JP7238178A JPS54162666A JP S54162666 A JPS54162666 A JP S54162666A JP 7238178 A JP7238178 A JP 7238178A JP 7238178 A JP7238178 A JP 7238178A JP S54162666 A JPS54162666 A JP S54162666A
- Authority
- JP
- Japan
- Prior art keywords
- particle
- cobalt
- chromium
- needlelike
- oxide
- 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
Abstract
PURPOSE: To stably manufacture the alloy particle with high magnetic characteristic and the needle property, by coating the surface of the needlelike iron compound particle with cobalt and chromium hydroxide, and by executing the heat treatment within the desirable nonreducing atmosphere, for obtaining the needlelike oxide particle which is then to be treated by the reducing treatment.
CONSTITUTION: The surface of the needlelike iron compound particle is coated with both of cobalt and chromium hydroxide; after that, it is desired that the particle is heat treated within the nonreducing atmosphere; hereupon, depending on the difference between the diffusion coefficients of cobalt and chromium, cobalt diffuses from the surface into the interior of particle and forms a solid solution with the iron oxide of the interior; on the other hand, chromium of small diffusion coefficient resides in the surface of particle. The amount of thus obtained Fe - Co particle is small; however, in the surface of particle, chromium layer distributes at high concentration; especially, this oxide particle hardly causes the interglanular sintering at the reducing treatment, and maintains the initial needle property at good condition.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7238178A JPS54162666A (en) | 1978-06-15 | 1978-06-15 | Manufacture of needlelike magnetic alloy particle |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7238178A JPS54162666A (en) | 1978-06-15 | 1978-06-15 | Manufacture of needlelike magnetic alloy particle |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54162666A true JPS54162666A (en) | 1979-12-24 |
JPS579602B2 JPS579602B2 (en) | 1982-02-22 |
Family
ID=13487647
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7238178A Granted JPS54162666A (en) | 1978-06-15 | 1978-06-15 | Manufacture of needlelike magnetic alloy particle |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54162666A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58119609A (en) * | 1982-01-11 | 1983-07-16 | Fuji Photo Film Co Ltd | Magnetic recording medium |
JPS595424A (en) * | 1982-07-01 | 1984-01-12 | Sony Corp | Magnetic recording medium |
JPS59142742A (en) * | 1983-02-04 | 1984-08-16 | Fuji Photo Film Co Ltd | Magnetic recording medium |
JPS59157204A (en) * | 1983-02-23 | 1984-09-06 | Chisso Corp | Manufacture of ferromagnetic metallic fine particle |
JPS60223018A (en) * | 1984-04-18 | 1985-11-07 | Fuji Photo Film Co Ltd | Magnetic recording medium |
JPH08329446A (en) * | 1994-10-24 | 1996-12-13 | Fuji Photo Film Co Ltd | Reproducing method of video image |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5724103U (en) * | 1980-07-17 | 1982-02-08 | ||
JPS62163402U (en) * | 1986-04-08 | 1987-10-17 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54122663A (en) * | 1978-03-16 | 1979-09-22 | Kanto Denka Kogyo Kk | Production of magnetic powder for magnetic recording based on iron |
-
1978
- 1978-06-15 JP JP7238178A patent/JPS54162666A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54122663A (en) * | 1978-03-16 | 1979-09-22 | Kanto Denka Kogyo Kk | Production of magnetic powder for magnetic recording based on iron |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58119609A (en) * | 1982-01-11 | 1983-07-16 | Fuji Photo Film Co Ltd | Magnetic recording medium |
JPH0412009B2 (en) * | 1982-01-11 | 1992-03-03 | Fuji Photo Film Co Ltd | |
JPS595424A (en) * | 1982-07-01 | 1984-01-12 | Sony Corp | Magnetic recording medium |
JPH0159646B2 (en) * | 1982-07-01 | 1989-12-19 | Sony Corp | |
JPS59142742A (en) * | 1983-02-04 | 1984-08-16 | Fuji Photo Film Co Ltd | Magnetic recording medium |
JPS59157204A (en) * | 1983-02-23 | 1984-09-06 | Chisso Corp | Manufacture of ferromagnetic metallic fine particle |
JPS62204B2 (en) * | 1983-02-23 | 1987-01-06 | Chisso Corp | |
JPS60223018A (en) * | 1984-04-18 | 1985-11-07 | Fuji Photo Film Co Ltd | Magnetic recording medium |
JPH0520808B2 (en) * | 1984-04-18 | 1993-03-22 | Fuji Photo Film Co Ltd | |
JPH08329446A (en) * | 1994-10-24 | 1996-12-13 | Fuji Photo Film Co Ltd | Reproducing method of video image |
Also Published As
Publication number | Publication date |
---|---|
JPS579602B2 (en) | 1982-02-22 |
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