GB917698A - - Google Patents
Info
- Publication number
- GB917698A GB917698A GB917698DA GB917698A GB 917698 A GB917698 A GB 917698A GB 917698D A GB917698D A GB 917698DA GB 917698 A GB917698 A GB 917698A
- Authority
- GB
- United Kingdom
- Prior art keywords
- powder
- cavity
- coil
- direct current
- mould
- 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.)
- Active
Links
Classifications
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/004—Filling molds with powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Soft Magnetic Materials (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
917,698. Magnetic compositions. INDIANA GENERAL CORPORATION. Feb. 9, 1961, No. 4874/61. Class 38 (2). [Also in Group V] A method for the production of hard magnetic moulded bodies, e.g. of ferrites of the composition MO.6Fe 2 O 3 , where M is Ba, Sr, or Pb, or mixtures thereof, comprises providing the ferrite as a finely-divided dry powder (particle size between 0.2 and 1 micron), subjecting the powder to an attenuating current field, e.g. 50-60 c/s. to prevent agglomeration of the powder, and transferring the powder to a mould cavity 15 in which the particles of the powder are aligned by application of a direct current field, compressing the powder (9000 p.s.i.) while the particles are aligned and firing the pressed article, e.g. at 1200‹ to 1280‹ C. The powder 10 is contained in a hopper 1 and is fed to a filling shoe 3 through a flexible pipe 2. The hopper and the tube are preferably made of plastics and the shoe 3 may be made of any non- magnetic material. Coils 4, 14 and 24 are wound round the hopper, pipe and shoe, respectively, and an A.C. voltage may be applied separately to each of these coils or to the coils in series to give an A.C. field of 1000- 3000 oersted. However, the coil 24 is preferably fed with a pulsating direct current to give a maximum field strength of about 10,000 oersted. This aligns the particles as they pass into the mould cavity 15. This cavity is formed in a cylinder 16, e.g. of copper or steel fitted into a table 20 which is adapted to shield the cavity 15. A plunger 17 forms the base of the cavity. A coil 5 is supplied with a steady direct current to give a field (1500-3000 oersted) in the same direction as that of the coil 24, when the pulsating direct current is used in this coil. The filling shoe 3 is slidable on the table 20 to fill the mould cavity after which the mould is removed and a male mould member (not shown) is used to compress the powder in the cavity 15.
Publications (1)
Publication Number | Publication Date |
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GB917698A true GB917698A (en) |
Family
ID=1753529
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB917698D Active GB917698A (en) |
Country Status (1)
Country | Link |
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GB (1) | GB917698A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3427156A (en) * | 1964-12-22 | 1969-02-11 | Krebsoege Gmbh Sintermetall | Sintering method and article manufactured thereby |
GB2218979A (en) * | 1988-05-24 | 1989-11-29 | Ube Industries | Ceramics |
-
0
- GB GB917698D patent/GB917698A/en active Active
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3427156A (en) * | 1964-12-22 | 1969-02-11 | Krebsoege Gmbh Sintermetall | Sintering method and article manufactured thereby |
GB2218979A (en) * | 1988-05-24 | 1989-11-29 | Ube Industries | Ceramics |
US4937214A (en) * | 1988-05-24 | 1990-06-26 | Ube Industries Co., Ltd. | Process for production of crystal grain-oriented ceramics |
GB2218979B (en) * | 1988-05-24 | 1992-07-15 | Ube Industries | Process for the production of crystal grain-oriented ceramics |
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