JPS57140307A - Manufacture of metallic nitride powder for magnetic recording - Google Patents
Manufacture of metallic nitride powder for magnetic recordingInfo
- Publication number
- JPS57140307A JPS57140307A JP56025077A JP2507781A JPS57140307A JP S57140307 A JPS57140307 A JP S57140307A JP 56025077 A JP56025077 A JP 56025077A JP 2507781 A JP2507781 A JP 2507781A JP S57140307 A JPS57140307 A JP S57140307A
- Authority
- JP
- Japan
- Prior art keywords
- manufacture
- nitride powder
- gaseous mixture
- metallic nitride
- magnetic recording
- 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
- Hard Magnetic Materials (AREA)
Abstract
PURPOSE: To manufacture the titled metallic nitride powder made essentially of Fe4N and free from sintering among the particles by bringing H2 and NH3 into contact with iron oxide or the like while changing the mixing ratio as the reaction proceeds.
CONSTITUTION: Iron oxide such as α-Fe2O3 or iron oxyhydroxide such as α- FeOOH (A) is brought into contact with a gaseous mixture (B) of H2 with NH3 at about 350W550°C and reacted to form Fe4N. The material (A) may be impregnated or coated with a metallic compound of Co, Ni or the like. In the early stage of said reaction a gaseous mixture contg. ≥50% H2 preferably in <0.05vol. ratio of NH3/H2 is used, and as the reaction proceeds, the percentage of H2 is reduced. In the final stage a gaseous mixture contg. ≥50% NH3 preferably in 1W10vol. ratio of NH3/H2 is used.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56025077A JPS57140307A (en) | 1981-02-23 | 1981-02-23 | Manufacture of metallic nitride powder for magnetic recording |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56025077A JPS57140307A (en) | 1981-02-23 | 1981-02-23 | Manufacture of metallic nitride powder for magnetic recording |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57140307A true JPS57140307A (en) | 1982-08-30 |
JPH0123402B2 JPH0123402B2 (en) | 1989-05-02 |
Family
ID=12155856
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56025077A Granted JPS57140307A (en) | 1981-02-23 | 1981-02-23 | Manufacture of metallic nitride powder for magnetic recording |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57140307A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59144035A (en) * | 1983-02-07 | 1984-08-17 | Hitachi Maxell Ltd | Magnetic recording medium |
JPS59154640A (en) * | 1983-02-23 | 1984-09-03 | Hitachi Maxell Ltd | Magnetic recording medium |
JPS59228705A (en) * | 1983-06-10 | 1984-12-22 | Hitachi Ltd | Vertical magnetic recording medium and manufacture of the same |
JPS60247822A (en) * | 1984-05-24 | 1985-12-07 | Konishiroku Photo Ind Co Ltd | Magnetic recording medium |
JPS62271403A (en) * | 1986-05-20 | 1987-11-25 | Taiyo Yuden Co Ltd | Nitrided iron system magnetic powder |
JP2005268389A (en) * | 2004-03-17 | 2005-09-29 | Dowa Mining Co Ltd | Iron-nitride magnetic powder and its manufacturing method |
JP2007036027A (en) * | 2005-07-28 | 2007-02-08 | Dowa Holdings Co Ltd | Magnetic powder suitable for low noise medium |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2021241415A1 (en) | 2020-05-27 | 2021-12-02 | パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカ | Anomaly detection system and anomaly detection method |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5039300A (en) * | 1973-08-10 | 1975-04-11 | ||
JPS5151796A (en) * | 1974-10-31 | 1976-05-07 | Sony Corp |
-
1981
- 1981-02-23 JP JP56025077A patent/JPS57140307A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5039300A (en) * | 1973-08-10 | 1975-04-11 | ||
JPS5151796A (en) * | 1974-10-31 | 1976-05-07 | Sony Corp |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59144035A (en) * | 1983-02-07 | 1984-08-17 | Hitachi Maxell Ltd | Magnetic recording medium |
JPH0568008B2 (en) * | 1983-02-07 | 1993-09-28 | Hitachi Maxell | |
JPS59154640A (en) * | 1983-02-23 | 1984-09-03 | Hitachi Maxell Ltd | Magnetic recording medium |
JPS59228705A (en) * | 1983-06-10 | 1984-12-22 | Hitachi Ltd | Vertical magnetic recording medium and manufacture of the same |
JPS60247822A (en) * | 1984-05-24 | 1985-12-07 | Konishiroku Photo Ind Co Ltd | Magnetic recording medium |
JPS62271403A (en) * | 1986-05-20 | 1987-11-25 | Taiyo Yuden Co Ltd | Nitrided iron system magnetic powder |
JP2005268389A (en) * | 2004-03-17 | 2005-09-29 | Dowa Mining Co Ltd | Iron-nitride magnetic powder and its manufacturing method |
JP4534059B2 (en) * | 2004-03-17 | 2010-09-01 | Dowaエレクトロニクス株式会社 | Iron nitride magnetic powder and method for producing the same |
JP2007036027A (en) * | 2005-07-28 | 2007-02-08 | Dowa Holdings Co Ltd | Magnetic powder suitable for low noise medium |
Also Published As
Publication number | Publication date |
---|---|
JPH0123402B2 (en) | 1989-05-02 |
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