GB1523910A - Method of manufacturing ferrite cores - Google Patents

Method of manufacturing ferrite cores

Info

Publication number
GB1523910A
GB1523910A GB4462575A GB4462575A GB1523910A GB 1523910 A GB1523910 A GB 1523910A GB 4462575 A GB4462575 A GB 4462575A GB 4462575 A GB4462575 A GB 4462575A GB 1523910 A GB1523910 A GB 1523910A
Authority
GB
United Kingdom
Prior art keywords
ferrous
sintering temperature
manganese
heating
zinc
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
GB4462575A
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 Electronics UK Ltd
Original Assignee
Philips Electronic and Associated 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
Application filed by Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1523910A publication Critical patent/GB1523910A/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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/133—Structure or manufacture of heads, e.g. inductive with cores composed of particles, e.g. with dust cores, with ferrite cores with cores composed of isolated magnetic particles

Landscapes

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

Abstract

1523910 Manganese zinc ferrous ferrites PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 29 Oct 1975 [12 Nov 1974] 44625/75 Heading C1J A manganese-zinc-ferrous ferrite body (e.g. a core for a magnetic head) having a reduced porosity of less than 1% is manufactured by preparing a mixture containing oxides of iron, manganese and zinc and/or compounds which form these oxides on heating; prefiring the mixture, grinding the prefired material, compressing the ground material, heating the compressed material to the sintering temperature and sintering the compressed material wherein the material to be heated and sintered is given a ferrous content which differs by not more than 20% from the ferrous content of the stoichiometric composition (ratio of cations to anions is 3:4) during one of the steps preceding the step of heating the compressed material to the sintering temperature. The sintering temperature is between 1200‹ C. and 1300‹ C. except in the case where the mixture contains the required ferrous ion in the form of Fe 3 O 4 when the sintering temperature is between 1050‹ C. and 1300‹ C. The ferrous content may also be given during the prefiring step by use of an oxygen containing atmosphere, the partial oxygen pressure of which corresponds to the equilibrium oxygen pressure of the material having the stoichiometric spinel composition of the temperature used.
GB4462575A 1974-11-12 1975-10-29 Method of manufacturing ferrite cores Expired GB1523910A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7414706A NL7414706A (en) 1974-11-12 1974-11-12 PROCESS FOR MANUFACTURE OF A MANGANESE ZINC FERRITE CORE, PARTICULARLY FOR USE IN MAGNETIC HEADS.

Publications (1)

Publication Number Publication Date
GB1523910A true GB1523910A (en) 1978-09-06

Family

ID=19822445

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4462575A Expired GB1523910A (en) 1974-11-12 1975-10-29 Method of manufacturing ferrite cores

Country Status (7)

Country Link
JP (1) JPS5170495A (en)
BE (1) BE835447A (en)
CA (1) CA1073658A (en)
DE (1) DE2549085C2 (en)
FR (1) FR2291572A1 (en)
GB (1) GB1523910A (en)
NL (1) NL7414706A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2641319A1 (en) * 1976-09-14 1978-03-16 Siemens Ag Manganese zinc ferrite or nickel zinc ferrite core - with low signal-noise ratio in magnetic recording heads
NL8002990A (en) * 1980-05-23 1981-12-16 Philips Nv METHOD FOR MANUFACTURING AN ANISOTROPIC PERMANENT OXIDE BASED MAGNET
US4375657A (en) * 1980-11-03 1983-03-01 Brock George W Magnetic head assembly
NL8200174A (en) * 1982-01-19 1983-08-16 Philips Nv MAGNETIC HEAD OF ZINC-FERRO-FERRITE.
CA1242314A (en) * 1983-12-29 1988-09-27 Ralph W. Scheidecker Process for controlling ferrous iron content in manganese zinc ferrite

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1144285A (en) * 1967-02-09 1969-03-05 Matsushita Electric Ind Co Ltd Improvements in and relating to magnetic materials and devices

Also Published As

Publication number Publication date
FR2291572A1 (en) 1976-06-11
BE835447A (en) 1976-05-10
DE2549085C2 (en) 1985-04-11
JPS5170495A (en) 1976-06-18
FR2291572B1 (en) 1981-11-27
JPS5524684B2 (en) 1980-07-01
CA1073658A (en) 1980-03-18
DE2549085A1 (en) 1976-05-13
NL7414706A (en) 1976-05-14

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee