JPS5595627A - Manufacture of magnetic material - Google Patents
Manufacture of magnetic materialInfo
- Publication number
- JPS5595627A JPS5595627A JP225080A JP225080A JPS5595627A JP S5595627 A JPS5595627 A JP S5595627A JP 225080 A JP225080 A JP 225080A JP 225080 A JP225080 A JP 225080A JP S5595627 A JPS5595627 A JP S5595627A
- Authority
- JP
- Japan
- Prior art keywords
- slurry
- alkali
- magnetic material
- naoh
- citric acid
- 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
- Compounds Of Iron (AREA)
- Hard Magnetic Materials (AREA)
Abstract
PURPOSE: To provide a magnetic material with superior dispersibility, magnetic field orientation properties, etc. by adding an alkali to a slurry contg. ferric hydroxide, citric acid (salt) and an alkali cpd. to adjust the slurry to a specified pH value followed by heating at a specified temp.
CONSTITUTION: An alkali such as NaOH is added to a slurry contg. a predetermined amt. of ferric hydroxide, citric acid or its slat, and an alkali cpd. such as NaOH so that the slurry is adjusted to pH10W13 at 25°C. The pH-adjusted slurry is heated to a treatment temp. of 100W250°C and agitated to form needlelike α-Fe2O3, which is then separated by heat reduction or other method to obtain magnetite taking over the needle form of α-Fe2O3. The magnetite may be reoxidized to give γ-Fe2O3 taking over the needle form. The magnetic material for recording obtd. by this method has no pore in the particles and high density, is free from branching, and exhibits superior magnetic characteristics.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP225080A JPS5595627A (en) | 1980-01-12 | 1980-01-12 | Manufacture of magnetic material |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP225080A JPS5595627A (en) | 1980-01-12 | 1980-01-12 | Manufacture of magnetic material |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13708777A Division JPS5469594A (en) | 1977-11-14 | 1977-11-14 | Production of ferric oxide and magnetic material |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5595627A true JPS5595627A (en) | 1980-07-21 |
JPS5617290B2 JPS5617290B2 (en) | 1981-04-21 |
Family
ID=11524106
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP225080A Granted JPS5595627A (en) | 1980-01-12 | 1980-01-12 | Manufacture of magnetic material |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5595627A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57123831A (en) * | 1981-01-20 | 1982-08-02 | Sakai Chem Ind Co Ltd | Preparation of magnetic iron oxide powder |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60148895A (en) * | 1984-01-11 | 1985-08-06 | 株式会社日立製作所 | Electric chain block |
-
1980
- 1980-01-12 JP JP225080A patent/JPS5595627A/en active Granted
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57123831A (en) * | 1981-01-20 | 1982-08-02 | Sakai Chem Ind Co Ltd | Preparation of magnetic iron oxide powder |
JPS6029646B2 (en) * | 1981-01-20 | 1985-07-11 | 堺化学工業株式会社 | Method for producing magnetic iron oxide powder |
Also Published As
Publication number | Publication date |
---|---|
JPS5617290B2 (en) | 1981-04-21 |
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