GB708127A - Improvements in or relating to non-metallic permanent magnetic bodies - Google Patents

Improvements in or relating to non-metallic permanent magnetic bodies

Info

Publication number
GB708127A
GB708127A GB16532/51A GB1653251A GB708127A GB 708127 A GB708127 A GB 708127A GB 16532/51 A GB16532/51 A GB 16532/51A GB 1653251 A GB1653251 A GB 1653251A GB 708127 A GB708127 A GB 708127A
Authority
GB
United Kingdom
Prior art keywords
oersted
gauss
per cent
metals
steps
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
Application number
GB16532/51A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26641578&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=GB708127(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB708127A publication Critical patent/GB708127A/en
Expired legal-status Critical Current

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
    • 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

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

708,127. Magnetic compositions. PHILIPS ELECTRICAL INDUSTRIES. Ltd. July 12, 1951 [Sept. 19, 1950; April 23. 1951], No. 16532/51. Class 38(2) A ferromagnetic material suitable for permanent magnets, having a retentivity Br of at least 1200 Gauss and needing a field strength I H C for disappearance of the magnetization of at least 700 Oersted, comprises non-cubic crystals of mixed oxides of iron and one or more of the metals (M) barium, strontium and lead. Calcium may replace up to two fifths of these last metals. The crystals are generally hexagonal and may have the structure of magneto-pluinbite, and their permanent magnetic properties are related to the small grain size of the material. The material may have the formula MO6Fe 2 O 3 ; an alternative, Ba Fe 18 O 27 is also described. Up to 40 per cent of impurities may be allowable as a separate phrase. A large number of examples are described in which Fe 2 O 3 and carbonates of M are ground in a ball mill with alcohol (or ethanol) and some or all of the following steps are carried out. These steps are, drying the mixture, sieving. presintering once or twice, mixing with a binder, extruding or moulding into rods which are air dried, and sintering in air for 3-20 min. at a temperature between 900‹ and 1450‹C but preferably above 1100‹C. In producing the BaFe 18 O 27 the method is slightly different and includes sintering in CO 2 . An example is also described in which the Fe 2 O 3 is replaced by actual magnetite. Values of Br (up to 2155 Gauss) and of I H C (up to 3900 Oersted) are stated for each example. The pore volume may be less than 15 per cent. The materials, which have high specific resistance, may be used for magnetic recording purposes.
GB16532/51A 1950-09-19 1951-07-12 Improvements in or relating to non-metallic permanent magnetic bodies Expired GB708127A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL156104 1950-09-19
NL160732 1951-04-23

Publications (1)

Publication Number Publication Date
GB708127A true GB708127A (en) 1954-04-28

Family

ID=26641578

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16532/51A Expired GB708127A (en) 1950-09-19 1951-07-12 Improvements in or relating to non-metallic permanent magnetic bodies

Country Status (9)

Country Link
US (1) US2762777A (en)
AT (1) AT196629B (en)
BE (1) BE504686A (en)
CH (1) CH306773A (en)
DE (1) DE977105C (en)
FR (1) FR1048792A (en)
GB (1) GB708127A (en)
LU (1) LU30876A1 (en)
NL (2) NL87161C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3184807A (en) * 1958-11-24 1965-05-25 Goodrich Co B F Gasket containing a permanent magnet

Families Citing this family (46)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU30876A1 (en) * 1950-09-19
DE977273C (en) * 1951-04-23 1965-09-09 Philips Nv Ferromagnetic core pre-magnetized by a permanent magnet with adjustable pre-magnetization
DE958044C (en) * 1952-04-22 1957-02-14 Eisen & Stahlind Ag Permanent magnet system for eddy current damping
LU32262A1 (en) * 1952-07-07
US2778803A (en) * 1953-02-06 1957-01-22 Aerovox Corp Magnetically hard materials
DE1026013B (en) * 1953-04-11 1958-03-13 Philips Nv Method and device for the production of a multi-pole, anisotropic, cylindrical, sintered permanent magnet
US2900344A (en) * 1953-07-29 1959-08-18 Philips Corp Making anisotropic permanent magnets
DE1010440B (en) * 1954-03-24 1957-06-13 Licentia Gmbh Permanent magnet material based on oxide
DE1095398B (en) * 1954-10-02 1960-12-22 Philips Nv Method for magnetizing a permanent magnetic body
FR1114010A (en) * 1954-11-09 1956-04-06 Audax Sintered mixed oxide permanent magnets
US3001943A (en) * 1954-11-18 1961-09-26 Indiana General Corp Process of heat treating ferromagnetic material
LU34051A1 (en) * 1954-12-21
US2854412A (en) * 1954-12-23 1958-09-30 Philips Corp Method of making a permanent magnet
ES230262A1 (en) * 1955-08-10 1957-03-01 Philips Nv Ferromagnetic material
LU34570A1 (en) * 1955-08-10
NL88282C (en) * 1955-08-10 1958-05-16
NL97514C (en) * 1956-01-24 1961-04-17
DE1068610B (en) * 1956-03-06 1959-11-05 LIC1ENTIA Patent-VerwaHtungs-G.mib.H., Hamburg Process for the production of permanent magnets on an oxide basis
US3002929A (en) * 1956-05-01 1961-10-03 Bell Telephone Labor Inc Process for making composite ferrites
DE1236391B (en) * 1956-05-16 1967-03-09 Philips Nv Process for the production of a ferromagnetic ferrite material with a hexagonal crystal structure
NL112994C (en) * 1956-06-02 1966-07-15
US2862132A (en) * 1956-06-08 1958-11-25 Westinghouse Electric Corp Spark gap device
DE1092141B (en) * 1956-09-19 1960-11-03 Philips Nv Elongated permanent magnet with changing magnetization along the length of the magnet
NL92523C (en) * 1956-10-19 1959-10-15
CH363104A (en) * 1957-02-09 1962-07-15 Baermann Max Permanent magnetic closure, sealing or adhesive element and method for producing the same
NL111324C (en) * 1957-05-13 1965-06-15
NL99528C (en) * 1957-06-22 1961-11-15
NL95813C (en) * 1957-10-21 1960-11-15
US2959832A (en) * 1957-10-31 1960-11-15 Baermann Max Flexible or resilient permanent magnets
NL114061C (en) * 1957-12-31
US3042617A (en) * 1958-12-31 1962-07-03 Rca Corp Magnetic bodies and methods of preparation thereof
US3185986A (en) * 1959-03-05 1965-05-25 James R Mccaughna Microwave absorber and method of manufacture
US2927898A (en) * 1959-03-30 1960-03-08 Licentia Gmbh Permanent magnet material
US3113109A (en) * 1959-10-07 1963-12-03 Du Pont Ferromagnetic material produced from ferric oxide and barium halide or strontium halide, and process for making same
US3049404A (en) * 1960-02-03 1962-08-14 Jr William L Wade Method of making ferromagnetic barium ferrites
NL270374A (en) * 1960-10-18
US3093589A (en) * 1961-05-11 1963-06-11 Columbian Carbon Magnetic material
DE1233313B (en) * 1961-06-02 1967-01-26 Commissariat Energie Atomique Process for sintering metal oxide powders
US3151703A (en) * 1962-01-02 1964-10-06 Gen Motors Corp Transmission
DE1471047B1 (en) * 1962-07-31 1969-11-06 Westinghouse Electric Corp Permanent magnet material with a primary crystal phase based on barium, strontium and / or lead ferrite, as well as a process for the production of such a material
NL296037A (en) * 1962-08-01
US3855374A (en) * 1970-07-02 1974-12-17 Gen Motors Corp Method of making magnetically-anisotropic permanent magnets
US4000004A (en) * 1972-10-23 1976-12-28 Agency Of Industrial Science & Technology Electrode for alkaline storage battery and method for manufacture thereof
NL8002990A (en) * 1980-05-23 1981-12-16 Philips Nv METHOD FOR MANUFACTURING AN ANISOTROPIC PERMANENT OXIDE BASED MAGNET
US4440713A (en) * 1982-09-30 1984-04-03 International Business Machines Corp. Process for making fine magnetic ferrite powder and dense ferrite blocks
JP4391897B2 (en) 2004-07-01 2009-12-24 インターメタリックス株式会社 Manufacturing method and manufacturing apparatus for magnetic anisotropic rare earth sintered magnet

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US256023A (en) * 1882-04-04 Refrigerator cooled by ammonia and other volatile liquids
DE226347C (en) *
DE227787C (en) *
US239838A (en) * 1881-04-05 Table
US1997193A (en) * 1930-12-25 1935-04-09 Mitsubishi Electric Corp Permanent magnet and method of manufacturing same
US1976230A (en) * 1930-12-25 1934-10-09 Mitsubishi Electric Corp Permanent magnet and method of manufacturing same
DE723872C (en) * 1932-07-09 1942-08-12 Mitsubishi Electric Corp Permanent magnet
US2132404A (en) * 1934-02-17 1938-10-11 Reginald S Dean Method of separating magnetic material
DE653945C (en) * 1934-07-08 1937-12-07 I G Farbenindustrie Akt Ges Process for the representation of plastic masses
DE656966C (en) * 1934-07-12 1938-02-21 Dynamit Act Ges Vormals Alfred Permanent magnet and process for its manufacture
BE456575A (en) * 1943-07-01
DE970931C (en) * 1943-08-21 1958-10-30 Societe d'Electro-Chimie, d'Electro-Mctallurgie et des Acieries electriques d'Ugine, Paris Process for the production of permanent magnets from iron and cobalt oxides
AT165288B (en) * 1943-08-21 1950-02-10 Electro Chimie Metal Process for the production of permanent magnets on an oxide basis
AT165289B (en) * 1944-07-26 1950-02-10 Electro Chimie Metal Process for the production of an iron powder suitable for permanent magnets and permanent magnets produced from this powder
LU30876A1 (en) * 1950-09-19

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3184807A (en) * 1958-11-24 1965-05-25 Goodrich Co B F Gasket containing a permanent magnet

Also Published As

Publication number Publication date
US2762777A (en) 1956-09-11
LU30876A1 (en)
DE977105C (en) 1965-02-11
NL87161C (en)
AT196629B (en) 1958-03-25
BE504686A (en)
NL87162C (en)
FR1048792A (en) 1953-12-23
CH306773A (en) 1955-04-30

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