JPS6449206A - Manufacture of hexagonal system ferrite magnetic powder - Google Patents
Manufacture of hexagonal system ferrite magnetic powderInfo
- Publication number
- JPS6449206A JPS6449206A JP62206164A JP20616487A JPS6449206A JP S6449206 A JPS6449206 A JP S6449206A JP 62206164 A JP62206164 A JP 62206164A JP 20616487 A JP20616487 A JP 20616487A JP S6449206 A JPS6449206 A JP S6449206A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic powder
- aqueous
- hexagonal system
- coprecipitate
- nonionic surfactant
- 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 magnetic powder having high saturated magnetic flux density by bringing magnetic powder to be eventually obtained into contact with 0.01wt.% or more of aqueous soluble polymer and/or sulfonic acid, hydrosulfuric acid ester or nonionic surfactant with respect to the magnetic powder. CONSTITUTION:Aqueous solution containing 8-16 to 0.8-3 of molar ratio of Fe ions to one or more metallic ions selected from a group consisting of Ba, Sr, Ca and Pb is mixed with aqueous alkaline solution, such as ammonia, ammonium carbonate, etc., and coprecipitate is produced under the conditions of the liquid temperature of 25 deg. and pH of 5 or above. In this case, after the quantity of 0.01wt.% or more of aqueous soluble polymer having high molecular weight, such as aqueous polymer like methyl cellulose, ethyl cellulose, etc., or sulfonate, hydrosulfonic acid ester and nonionic surfactant from oligomer with respect to the magnetic powder to be eventually obtained is brought into contact with the magnetic powder, obtained coprecipitate is heated to obtain hexagonal system ferrite magnetic powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62206164A JPS6449206A (en) | 1987-08-19 | 1987-08-19 | Manufacture of hexagonal system ferrite magnetic powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62206164A JPS6449206A (en) | 1987-08-19 | 1987-08-19 | Manufacture of hexagonal system ferrite magnetic powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6449206A true JPS6449206A (en) | 1989-02-23 |
Family
ID=16518864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62206164A Pending JPS6449206A (en) | 1987-08-19 | 1987-08-19 | Manufacture of hexagonal system ferrite magnetic powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6449206A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993022777A1 (en) * | 1992-04-24 | 1993-11-11 | Tdk Corporation | Method of producing anisotropic ferrite magnet, anisotropic ferrite magnet, hexagonal ferrite particles, and method for producing them |
| WO2011062217A1 (en) * | 2009-11-20 | 2011-05-26 | 戸田工業株式会社 | Magnetic iron oxide microparticle powder, aqueous dispersion containing magnetic particles, and process for production of same |
-
1987
- 1987-08-19 JP JP62206164A patent/JPS6449206A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993022777A1 (en) * | 1992-04-24 | 1993-11-11 | Tdk Corporation | Method of producing anisotropic ferrite magnet, anisotropic ferrite magnet, hexagonal ferrite particles, and method for producing them |
| WO2011062217A1 (en) * | 2009-11-20 | 2011-05-26 | 戸田工業株式会社 | Magnetic iron oxide microparticle powder, aqueous dispersion containing magnetic particles, and process for production of same |
| US9127168B2 (en) | 2009-11-20 | 2015-09-08 | Toda Kogyo Corporation | Magnetic iron oxide fine particles, and magnetic particle-containing water dispersion and process for producing the same |
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