GB655666A - Improvements in or relating to magnetic materials - Google Patents

Improvements in or relating to magnetic materials

Info

Publication number
GB655666A
GB655666A GB508/47A GB50847A GB655666A GB 655666 A GB655666 A GB 655666A GB 508/47 A GB508/47 A GB 508/47A GB 50847 A GB50847 A GB 50847A GB 655666 A GB655666 A GB 655666A
Authority
GB
United Kingdom
Prior art keywords
ferrite
per cent
oxides
sintered
mol
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
GB508/47A
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 Lamps Ltd
Koninklijke Philips NV
Original Assignee
Philips Lamps Ltd
Philips Gloeilampenfabrieken NV
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=19750358&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=GB655666(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Philips Lamps Ltd, Philips Gloeilampenfabrieken NV filed Critical Philips Lamps Ltd
Publication of GB655666A publication Critical patent/GB655666A/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
    • C04B35/2658—Other ferrites containing manganese or zinc, e.g. Mn-Zn ferrites
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/008—Details of transformers or inductances, in general with temperature compensation

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Soft Magnetic Materials (AREA)
  • Magnetic Ceramics (AREA)
  • Compounds Of Iron (AREA)

Abstract

A magnetic material suitable for cores used in communication apparatus contains a cubic ferrite consisting of a substantially homogeneous cubic mixed crystal phase having a Curie-point between 40 DEG and 250 DEG C., a tan d /m value of less than 0.0001 at a frequency of 100 kc./sec., and having a ratio of manganese, zinc and iron compounds expressed in terms of the relative oxides of 15-35 mol. per cent, MnO; 15-30 mol. per cent ZnO; 45-60 mol. per cent Fe2O3. In one method of making the ferrite, a mixture of zinc oxide, manganese dioxide and iron oxide are ground for twelve hours in a ball mill, moulded into a ring with water as a plastifying agent and binder at 4000 kg./cm.2, sintered for two hours at 1300 DEG C. in oxygen and cooled in oxygen to 200 DEG C. in three hours. The proportions of starting oxides may vary, the iron oxide being preferably at least 52 per cent of the total. The oxides may be precipitated from a solution containing the three metals, or carbonates or other compounds forming oxides upon heating may be used, being compressed and sintered until they become ferrite. The sintered product may be ground and re-sintered, and the cooling rate should be about 5 DEG C. per minute. For ferrites produced by various slightly different methods values are given of tan d /m , the Curie-point, the initial permeability, and the hysteresis factor Rh/Z. Ferrites with a reluctance having a negative temperature coefficient of 1/m may be obtained, and when combined with a ferrite having a positive coefficient, a material with a substantially zero coefficient may be obtained. Specifications 626,946 and 631,886 are referred to.
GB508/47A 1943-07-01 1947-01-07 Improvements in or relating to magnetic materials Expired GB655666A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL112041 1943-07-01

Publications (1)

Publication Number Publication Date
GB655666A true GB655666A (en) 1951-08-01

Family

ID=19750358

Family Applications (1)

Application Number Title Priority Date Filing Date
GB508/47A Expired GB655666A (en) 1943-07-01 1947-01-07 Improvements in or relating to magnetic materials

Country Status (8)

Country Link
US (1) US2551711A (en)
BE (1) BE456575A (en)
CH (1) CH254931A (en)
DE (1) DE975802C (en)
ES (2) ES166680A1 (en)
FR (1) FR906784A (en)
GB (1) GB655666A (en)
NL (1) NL63875C (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1089317B (en) * 1957-04-01 1960-09-15 Western Electric Co Process for the production of manganese-zinc ferrite bodies
DE1152345B (en) * 1958-03-25 1963-08-01 Siemens Ag Process for the production of a soft magnetic ferrite with a permeable character
DE1227820B (en) * 1956-12-03 1966-10-27 Philips Nv Process for the production of ferromagnetic oxidic bodies
DE1239606B (en) * 1955-02-03 1967-04-27 Lignes Telegraph Telephon Process for the production of ferromagnetic cores with a largely rectangular hysteresis loop

Families Citing this family (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE975757C (en) * 1948-10-02 1962-08-09 Siemens Ag Process for the production of sintered ferromagnetic ferrite bodies
DE975729C (en) * 1948-12-22 1962-07-05 Siemens Ag Process for the production of ferrite cores
NL87162C (en) * 1950-09-19
NL91692C (en) * 1952-02-22
DE973358C (en) * 1952-04-04 1960-02-04 Steatit Magnesia Ag Process for improving the magnetic properties of ferrites
BE521341A (en) * 1952-07-10
US2760168A (en) * 1952-08-16 1956-08-21 Collins Radio Co Temperature compensation for a magnetostrictive transducer
US2751354A (en) * 1953-04-10 1956-06-19 Philips Corp Method of manufacturing a magnetic ferrite core
FR1110334A (en) * 1954-07-13 1956-02-10 Improvements to such ferromagnetic materials
NL104059C (en) * 1955-05-03
US2950251A (en) * 1955-09-19 1960-08-23 Rca Corp Magnetic materials having rectangular hysteresis characteristics
NL96342C (en) * 1955-10-20
US2992990A (en) * 1956-01-05 1961-07-18 Richard G Parker Soft magnetic material
US2962444A (en) * 1956-01-19 1960-11-29 Centre Nat Rech Scient Ferromagnetic ceramic materials
US2980617A (en) * 1956-03-13 1961-04-18 Indiana General Corp Ferrite compositions and method of making same
US3065181A (en) * 1956-09-24 1962-11-20 Sprague Electric Co Inductor materials
NL113688C (en) * 1956-10-30 1967-06-15 Philips Nv
BE562891A (en) * 1956-12-14
DE1057003B (en) * 1957-01-21 1959-05-06 Bayer Ag Process for the production of ferrites
US2947890A (en) * 1957-03-25 1960-08-02 Harris Transducer Corp Transducer
US2981690A (en) * 1957-06-18 1961-04-25 Steatite Res Corp Ferrites with square hysteresis loops
US3027327A (en) * 1957-10-08 1962-03-27 Gen Electric Preparation of ferromagnetic ferrite materials
US3046228A (en) * 1959-06-08 1962-07-24 Allen Bradley Co Method of preparing a zinc manganese ferrite
DE1170304B (en) * 1959-07-24 1964-05-14 Itt Process for the production of a ferromagnetic material
US3154493A (en) * 1960-07-11 1964-10-27 Itt Magnetic materials
US3440169A (en) * 1965-12-03 1969-04-22 Gen Telephone & Elect Cadmium-substituted ferrite materials
JPS565046B1 (en) * 1969-05-09 1981-02-03
JPS58140324A (en) * 1982-02-10 1983-08-20 Japan Metals & Chem Co Ltd Manufacture of ferrite as starting material
US6650068B2 (en) * 2000-03-13 2003-11-18 Matsushita Electric Industrial Co., Ltd. Induction coil core, illumination unit using the same, and polycrystalline ferrite
CN109485398B (en) * 2018-12-17 2021-10-22 安徽华林磁电科技有限公司 Electromagnetic absorber material
CN114315336A (en) * 2021-12-28 2022-04-12 南通华兴磁性材料有限公司 Preparation method of high-magnetic-property manganese-zinc ferrite
CN117894542A (en) * 2024-02-02 2024-04-16 南通华兴磁性材料有限公司 Broadband high-conductivity manganese zinc ferrite material and preparation method thereof

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US383942A (en) * 1888-06-05 Chaeles e
US1651955A (en) * 1926-01-16 1927-12-06 Lester H Hopewell Apparatus for preventing grade-crossing accidents
US1946964A (en) * 1933-07-11 1934-02-13 Boonton Res Corp Magnetic material and process of making the same
US2452529A (en) * 1941-10-24 1948-10-26 Hartford Nat Bank & Trust Co Magnet core
US2388664A (en) * 1942-11-05 1945-11-13 Western Electric Co Magnetic material
US2452530A (en) * 1943-05-15 1948-10-26 Hartford Nat Bank & Trust Co Magnetic core
US2452531A (en) * 1943-05-31 1948-10-26 Hartford Nat Bank & Trust Co Process of manufacturing a magnetic material and magnetic core

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1239606B (en) * 1955-02-03 1967-04-27 Lignes Telegraph Telephon Process for the production of ferromagnetic cores with a largely rectangular hysteresis loop
DE1227820B (en) * 1956-12-03 1966-10-27 Philips Nv Process for the production of ferromagnetic oxidic bodies
DE1089317B (en) * 1957-04-01 1960-09-15 Western Electric Co Process for the production of manganese-zinc ferrite bodies
DE1152345B (en) * 1958-03-25 1963-08-01 Siemens Ag Process for the production of a soft magnetic ferrite with a permeable character

Also Published As

Publication number Publication date
FR906784A (en) 1946-01-18
BE456575A (en)
NL63875C (en)
ES166680A1 (en) 1947-11-16
ES180068A1 (en) 1947-11-16
US2551711A (en) 1951-05-08
CH254931A (en) 1948-05-31
DE975802C (en) 1962-09-27

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