GB1317524A - Method of making ferrite products for permanent magnets - Google Patents
Method of making ferrite products for permanent magnetsInfo
- Publication number
- GB1317524A GB1317524A GB2959471A GB2959471A GB1317524A GB 1317524 A GB1317524 A GB 1317524A GB 2959471 A GB2959471 A GB 2959471A GB 2959471 A GB2959471 A GB 2959471A GB 1317524 A GB1317524 A GB 1317524A
- Authority
- GB
- United Kingdom
- Prior art keywords
- particles
- magnetite
- microns
- aqueous slurry
- forming
- 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.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
- C04B35/2683—Other ferrites containing alkaline earth metals or lead
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Hard Magnetic Materials (AREA)
Abstract
1317524 Magnetic materials GENERAL MOTORS CORP 24 June 1971 [2 July 1970] 29594/71 Heading N1H A hexagonal ferrite MO. 6Fe 2 O 3 (M = Ba, Sr or Pb) is made by milling a homogeneous mixture of magnetite (Fe 3 O 4 ), a source of BaO, SrO or PbO and 0À3-1À5 wt per cent boric acid or boric oxide, and calcining the resultant mixture. A permanent magnet is made by comminuting the calcined mixture, e.g., to 1-2 microns, orienting the particles and forming them into a body of required shape, and sintering the body at 1900-2150‹ F (1038-1177‹ C). The magnetite used may contain 93À02% Fe 3 O 4 , 6À15% Fe 2 O 3 , 0À1% Si, 0À06% V and less than 0À002% Ti and may have an initial particle size of 50 microns. Orientation may be effected magnetically by pressing an aqueous slurry of commincited particles in a directional magnetic field, or mechanically by dispersing the particles in a binder and forming a flexible sheet from which magnetic bodies are cut. In an example, test cylinders of density 2À75 g/cm<SP>3</SP> are pressed from an aqueous slurry of ferrite particles made from magnetite, strontium carbonate and H 3 BO 3 .
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US5175170A | 1970-07-02 | 1970-07-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1317524A true GB1317524A (en) | 1973-05-23 |
Family
ID=21973175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2959471A Expired GB1317524A (en) | 1970-07-02 | 1971-06-24 | Method of making ferrite products for permanent magnets |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5524250B1 (en) |
| CA (1) | CA933344A (en) |
| FR (1) | FR2100169A5 (en) |
| GB (1) | GB1317524A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4687608A (en) * | 1981-07-14 | 1987-08-18 | Hitachi Metals, Ltd. | Composite permanent magnet for magnetic excitation and method of producing the same |
| CN112174655A (en) * | 2020-10-17 | 2021-01-05 | 马鞍山市旭峰磁电有限公司 | Ferrite magnetic shoe with strong deformation resistance and manufacturing process thereof |
| CN115724655A (en) * | 2021-08-25 | 2023-03-03 | 横店集团东磁股份有限公司 | Method for preparing high-performance permanent magnetic ferrite material from low-purity iron oxide red |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IN150524B (en) * | 1978-02-09 | 1982-11-06 | Aimants Ugimag Sa | |
| FR2417168A1 (en) * | 1979-02-06 | 1979-09-07 | Aimants Ugimag Sa | Strong permanent magnets made from ferrite powder - esp. flexible magnets, using inexpensive process to produce high energy prod. |
-
1971
- 1971-06-18 CA CA116027A patent/CA933344A/en not_active Expired
- 1971-06-24 GB GB2959471A patent/GB1317524A/en not_active Expired
- 1971-07-02 JP JP4816271A patent/JPS5524250B1/ja active Pending
- 1971-07-02 FR FR7124242A patent/FR2100169A5/fr not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4687608A (en) * | 1981-07-14 | 1987-08-18 | Hitachi Metals, Ltd. | Composite permanent magnet for magnetic excitation and method of producing the same |
| CN112174655A (en) * | 2020-10-17 | 2021-01-05 | 马鞍山市旭峰磁电有限公司 | Ferrite magnetic shoe with strong deformation resistance and manufacturing process thereof |
| CN115724655A (en) * | 2021-08-25 | 2023-03-03 | 横店集团东磁股份有限公司 | Method for preparing high-performance permanent magnetic ferrite material from low-purity iron oxide red |
Also Published As
| Publication number | Publication date |
|---|---|
| CA933344A (en) | 1973-09-11 |
| FR2100169A5 (en) | 1972-03-17 |
| JPS5524250B1 (en) | 1980-06-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |