FR2417168A1 - Strong permanent magnets made from ferrite powder - esp. flexible magnets, using inexpensive process to produce high energy prod. - Google Patents
Strong permanent magnets made from ferrite powder - esp. flexible magnets, using inexpensive process to produce high energy prod.Info
- Publication number
- FR2417168A1 FR2417168A1 FR7903560A FR7903560A FR2417168A1 FR 2417168 A1 FR2417168 A1 FR 2417168A1 FR 7903560 A FR7903560 A FR 7903560A FR 7903560 A FR7903560 A FR 7903560A FR 2417168 A1 FR2417168 A1 FR 2417168A1
- Authority
- FR
- France
- Prior art keywords
- pref
- esp
- high energy
- produce high
- ferrite 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.)
- Granted
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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/10—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
- H01F1/11—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles
- H01F1/113—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles in a bonding agent
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Hard Magnetic Materials (AREA)
- Compounds Of Iron (AREA)
Abstract
A mixt. is made of Fe2O3; >=1 carbonate of Ba, Sr, and/or Pb; and (a) 0.5-15%, pref. 1-10 wt.% of >=1 alkali(ne earth) halide; plus (b) 0.2-7%, esp. 0.5-3% alkali(ne earth)borate. The mixt. is calcined at 850-1100 degrees C., pref. 900-1000 degrees C., for >=15 minutes. The powder then has a magneto-plumbite structure, and is mixed with a thermoplastic or-setting binder (c) and aligned by mechanical and/or magnetic means. Cpd. (a) is pref. NaF; whereas cpd. (b) is pref. B4 O7 Na2, 10H2O, using wt. ratio a:b 2-5:1 and 3-10% NaF(a). After adding binder (c) and calendering, 15% by vol. of the grains pref. have an intrinsic coercive (iHc) below 300 Oe, and/or 30 vol.% have iHc 2500 Oe. Used for the inexpensive mfr. of rigid or flexible magnets with energy prod., BH max x 106 G-Oe rising up to 1.8.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7903560A FR2417168A1 (en) | 1979-02-06 | 1979-02-06 | Strong permanent magnets made from ferrite powder - esp. flexible magnets, using inexpensive process to produce high energy prod. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7903560A FR2417168A1 (en) | 1979-02-06 | 1979-02-06 | Strong permanent magnets made from ferrite powder - esp. flexible magnets, using inexpensive process to produce high energy prod. |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2417168A1 true FR2417168A1 (en) | 1979-09-07 |
FR2417168B1 FR2417168B1 (en) | 1983-09-09 |
Family
ID=9221880
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7903560A Granted FR2417168A1 (en) | 1979-02-06 | 1979-02-06 | Strong permanent magnets made from ferrite powder - esp. flexible magnets, using inexpensive process to produce high energy prod. |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2417168A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1022969A (en) * | 1963-10-14 | 1966-03-16 | Rola Company Australia Proprie | Method of producing a permanent magnet material |
FR2022693A1 (en) * | 1968-11-06 | 1970-08-07 | Plessey Co Ltd | |
FR2100169A5 (en) * | 1970-07-02 | 1972-03-17 | Gen Motors Corp | |
FR2104252A5 (en) * | 1970-08-12 | 1972-04-14 | Minnesota Mining & Mfg | |
US3853975A (en) * | 1972-03-13 | 1974-12-10 | Shell Oil Co | Ceramic production |
-
1979
- 1979-02-06 FR FR7903560A patent/FR2417168A1/en active Granted
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1022969A (en) * | 1963-10-14 | 1966-03-16 | Rola Company Australia Proprie | Method of producing a permanent magnet material |
FR2022693A1 (en) * | 1968-11-06 | 1970-08-07 | Plessey Co Ltd | |
FR2100169A5 (en) * | 1970-07-02 | 1972-03-17 | Gen Motors Corp | |
FR2104252A5 (en) * | 1970-08-12 | 1972-04-14 | Minnesota Mining & Mfg | |
US3853975A (en) * | 1972-03-13 | 1974-12-10 | Shell Oil Co | Ceramic production |
Also Published As
Publication number | Publication date |
---|---|
FR2417168B1 (en) | 1983-09-09 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |