JPS6421002A - Method for stabilizing ferromagnetic iron powder - Google Patents
Method for stabilizing ferromagnetic iron powderInfo
- Publication number
- JPS6421002A JPS6421002A JP62176039A JP17603987A JPS6421002A JP S6421002 A JPS6421002 A JP S6421002A JP 62176039 A JP62176039 A JP 62176039A JP 17603987 A JP17603987 A JP 17603987A JP S6421002 A JPS6421002 A JP S6421002A
- Authority
- JP
- Japan
- Prior art keywords
- iron powder
- ferromagnetic iron
- reaction
- temp
- ferromagnetic
- 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title abstract 8
- 230000005294 ferromagnetic effect Effects 0.000 title abstract 6
- 238000000034 method Methods 0.000 title abstract 3
- 230000000087 stabilizing effect Effects 0.000 title 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract 2
- 239000001301 oxygen Substances 0.000 abstract 2
- 229910052760 oxygen Inorganic materials 0.000 abstract 2
- 239000007789 gas Substances 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 229910052742 iron Inorganic materials 0.000 abstract 1
- 230000005415 magnetization Effects 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 230000001590 oxidative effect Effects 0.000 abstract 1
- 230000006641 stabilisation Effects 0.000 abstract 1
- 238000011105 stabilization Methods 0.000 abstract 1
Landscapes
- Powder Metallurgy (AREA)
- Hard Magnetic Materials (AREA)
Abstract
PURPOSE:To stabilize ferromagnetic iron powder by heating to oxidize the ferromagnetic iron powder in gas atmosphere containing oxygen step by step in range of the specific temp. CONSTITUTION:The surface of the ferromagnetic iron powder composing of iron as main component produced by dry type reducing method is oxidized with reaction at four steps, that is under temps. of a first step; 50-150 deg.C, a second step; 0-40 deg.C, a third step; 45-70 deg.C, a fourth step; 0-40 deg.C. By this method, stabilization is easily executed without any damage to the saturation magnetization, and the ferromagnetic iron powder having excellent weather resistance can be produced. Further, it is desirable that the oxygen concn. in the reaction at the first step to the third step is >=about 0.05vol.% and <=the air composition, and oxidizing rate in the reaction at the first step is about 50-100g O2/1.0kg ferromagnetic iron powder and the reaction temp. at the second step is raised to about 5-50 deg.C/hr to come to the reaction temp. at the third step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62176039A JPS6421002A (en) | 1987-07-16 | 1987-07-16 | Method for stabilizing ferromagnetic iron powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62176039A JPS6421002A (en) | 1987-07-16 | 1987-07-16 | Method for stabilizing ferromagnetic iron powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6421002A true JPS6421002A (en) | 1989-01-24 |
Family
ID=16006651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62176039A Pending JPS6421002A (en) | 1987-07-16 | 1987-07-16 | Method for stabilizing ferromagnetic iron powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6421002A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01277322A (en) * | 1988-04-28 | 1989-11-07 | Konica Corp | Magnetic recording medium |
| JPH03148325A (en) * | 1989-10-31 | 1991-06-25 | Suzuki Motor Corp | Air conditioner for automobile |
| JP2002367142A (en) * | 2001-06-08 | 2002-12-20 | Sony Corp | Magnetic recording medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61132445A (en) * | 1984-11-29 | 1986-06-19 | Toyoda Gosei Co Ltd | Transparent decoration body |
| JPS6198651U (en) * | 1984-12-04 | 1986-06-24 |
-
1987
- 1987-07-16 JP JP62176039A patent/JPS6421002A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61132445A (en) * | 1984-11-29 | 1986-06-19 | Toyoda Gosei Co Ltd | Transparent decoration body |
| JPS6198651U (en) * | 1984-12-04 | 1986-06-24 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01277322A (en) * | 1988-04-28 | 1989-11-07 | Konica Corp | Magnetic recording medium |
| JPH03148325A (en) * | 1989-10-31 | 1991-06-25 | Suzuki Motor Corp | Air conditioner for automobile |
| JP2002367142A (en) * | 2001-06-08 | 2002-12-20 | Sony Corp | Magnetic recording medium |
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