GB740894A - Improvements in or relating to ferromagnetic material or ferromagnetic bodies and methods of manufacturing such material - Google Patents

Improvements in or relating to ferromagnetic material or ferromagnetic bodies and methods of manufacturing such material

Info

Publication number
GB740894A
GB740894A GB1785552A GB1785552A GB740894A GB 740894 A GB740894 A GB 740894A GB 1785552 A GB1785552 A GB 1785552A GB 1785552 A GB1785552 A GB 1785552A GB 740894 A GB740894 A GB 740894A
Authority
GB
United Kingdom
Prior art keywords
ferrite
permeability
sintering
per cent
ferromagnetic
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
GB1785552A
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
Application filed by Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB740894A publication Critical patent/GB740894A/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
    • C04B35/265—Compositions containing one or more ferrites of the group comprising manganese or zinc and one or more ferrites of the group comprising nickel, copper or cobalt

Abstract

740,894. Magnetic compositions. PHILIPS ELECTRICAL INDUSTRIES, Ltd. July 15, 1952 [July 18, 1951], No. 17855/52. Class 38 (2). A magnetic material suitable for loading coil cores, where it is desirable that the permeability Á remains constant with a varying magnetic field strength H, comprises spinel type ferrite crystals, having a value of tan # less than 0.06 at 2 kc./sec., a pore volume greater than 10 per cent, initial permeability Á 0 greater than 500 and a ratio of maximum permeability Ámax to Á 0 less than 1.2, the permeability being for the material when having an apparent density greater than 0.96 of the X-ray density. Such mixed ferrite material is made by preparing a mixture of oxides or materials which form oxides on heating, pre-sintering between 700‹ and 1000‹ C., and then sintering at least twice at a temperature above 1100‹ C., preferably above 1200‹ C. Nickel zinc ferrite may be prepared by presintering at 700‹ C. a mixture obtained by precipitation from a solution of metal compounds, sintering in air or oxygen at 1250‹ C. rings or plates pressed therefrom, crushing and grinding the sintered bodies, and resintering a further ring pressed from the material. The ferrite material should contain at least 28 mol per cent of nickel ferrite and not more than 72 mol. per cent of zinc ferrite.
GB1785552A 1951-07-18 1952-07-15 Improvements in or relating to ferromagnetic material or ferromagnetic bodies and methods of manufacturing such material Expired GB740894A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL162734 1951-07-18

Publications (1)

Publication Number Publication Date
GB740894A true GB740894A (en) 1955-11-23

Family

ID=19750530

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1785552A Expired GB740894A (en) 1951-07-18 1952-07-15 Improvements in or relating to ferromagnetic material or ferromagnetic bodies and methods of manufacturing such material

Country Status (7)

Country Link
BE (1) BE512885A (en)
CH (1) CH309314A (en)
DE (1) DE1036148B (en)
ES (2) ES204538A1 (en)
FR (1) FR1060311A (en)
GB (1) GB740894A (en)
NL (1) NL87776C (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3019189A (en) * 1958-04-07 1962-01-30 Steatite Res Corp Mixed ferrites by a coprecipitation process
US3039965A (en) * 1957-05-06 1962-06-19 Du Pont Ilmenite-type complex manganese oxides and preparation thereof
US3039964A (en) * 1957-05-06 1962-06-19 Du Pont Preparation of ilmenite-type compounds

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1202206B (en) * 1962-09-28 1965-09-30 Siemens Ag Use of iron (II) chloride waste solutions for the production of ferromagnetic ferrites

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE269325C (en) *
AT166840B (en) * 1941-10-24 1950-09-25 Philips Nv Magnetic molding and process for its manufacture

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3039965A (en) * 1957-05-06 1962-06-19 Du Pont Ilmenite-type complex manganese oxides and preparation thereof
US3039964A (en) * 1957-05-06 1962-06-19 Du Pont Preparation of ilmenite-type compounds
US3019189A (en) * 1958-04-07 1962-01-30 Steatite Res Corp Mixed ferrites by a coprecipitation process

Also Published As

Publication number Publication date
BE512885A (en)
ES204538A1 (en) 1953-01-16
NL87776C (en)
ES207543A1 (en) 1953-03-01
DE1036148B (en) 1958-08-07
CH309314A (en) 1955-08-31
FR1060311A (en) 1954-04-01

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