JPS54138894A - Production of magnetic iron oxide powder - Google Patents
Production of magnetic iron oxide powderInfo
- Publication number
- JPS54138894A JPS54138894A JP4757178A JP4757178A JPS54138894A JP S54138894 A JPS54138894 A JP S54138894A JP 4757178 A JP4757178 A JP 4757178A JP 4757178 A JP4757178 A JP 4757178A JP S54138894 A JPS54138894 A JP S54138894A
- Authority
- JP
- Japan
- Prior art keywords
- feooh
- powder
- production
- iron oxide
- oxide powder
- 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
Landscapes
- Compounds Of Iron (AREA)
- Hard Magnetic Materials (AREA)
Abstract
PURPOSE: To obtain the title powder with superior dispersibility and orientation property in magnetic coating without sintering the particles by synthesizing α- FeOOH in a basic aq. soln. and washing the α-FeOOH in an aq. org. acid soln. of pH 2W3, followed by heat reduction or reduction and oxidation.
CONSTITUTION: The above α-FeOOH is dispersed in pure water. An org. acid such as citric acid is added to adjust the dispersion to pH 2.0W3.0, and the α-FeOOH is wasged with strirring. The washed α-FeOOH is then reduced in a H2 atmosphere at 250W500°C to produce magnetitie (Fe3O4) magnetic powder. This powder is air-oxidized at below 300°C, usually around 250°C to produce maghemite (γ-Fe2O3) magnetic powder.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4757178A JPS54138894A (en) | 1978-04-20 | 1978-04-20 | Production of magnetic iron oxide powder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4757178A JPS54138894A (en) | 1978-04-20 | 1978-04-20 | Production of magnetic iron oxide powder |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54138894A true JPS54138894A (en) | 1979-10-27 |
Family
ID=12778914
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4757178A Pending JPS54138894A (en) | 1978-04-20 | 1978-04-20 | Production of magnetic iron oxide powder |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54138894A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2449711A1 (en) * | 1979-02-23 | 1980-09-19 | Philips Nv | PROCESS FOR THE PREPARATION OF A FEOOH PIGMENT, AND MAGNETIC RECORDING ELEMENT COMPRISING SUCH A PIGMENT |
FR2449710A1 (en) * | 1979-02-23 | 1980-09-19 | Philips Nv | PROCESS FOR THE PREPARATION OF A MAGNETIC PIGMENT OF G-FE2O3 PARTICLES AND MAGNETIC RECORDING ELEMENT COMPRISING SUCH A PIGMENT |
JPS62209806A (en) * | 1986-03-10 | 1987-09-16 | Matsushita Electric Ind Co Ltd | Preparation of magnetic powder |
JPS62244106A (en) * | 1986-04-17 | 1987-10-24 | Matsushita Electric Ind Co Ltd | Manufacture of magnetic powder |
JPS62259405A (en) * | 1986-05-02 | 1987-11-11 | Nissan Chem Ind Ltd | Spindle-like magnetic iron powder |
US4913890A (en) * | 1988-03-04 | 1990-04-03 | Basf Aktiengesellschaft | Preparation of acicular α-Fe2 O3 |
-
1978
- 1978-04-20 JP JP4757178A patent/JPS54138894A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2449711A1 (en) * | 1979-02-23 | 1980-09-19 | Philips Nv | PROCESS FOR THE PREPARATION OF A FEOOH PIGMENT, AND MAGNETIC RECORDING ELEMENT COMPRISING SUCH A PIGMENT |
FR2449710A1 (en) * | 1979-02-23 | 1980-09-19 | Philips Nv | PROCESS FOR THE PREPARATION OF A MAGNETIC PIGMENT OF G-FE2O3 PARTICLES AND MAGNETIC RECORDING ELEMENT COMPRISING SUCH A PIGMENT |
JPS62209806A (en) * | 1986-03-10 | 1987-09-16 | Matsushita Electric Ind Co Ltd | Preparation of magnetic powder |
JPS62244106A (en) * | 1986-04-17 | 1987-10-24 | Matsushita Electric Ind Co Ltd | Manufacture of magnetic powder |
JPS62259405A (en) * | 1986-05-02 | 1987-11-11 | Nissan Chem Ind Ltd | Spindle-like magnetic iron powder |
US4913890A (en) * | 1988-03-04 | 1990-04-03 | Basf Aktiengesellschaft | Preparation of acicular α-Fe2 O3 |
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