GB1251988A - - Google Patents

Info

Publication number
GB1251988A
GB1251988A GB1251988DA GB1251988A GB 1251988 A GB1251988 A GB 1251988A GB 1251988D A GB1251988D A GB 1251988DA GB 1251988 A GB1251988 A GB 1251988A
Authority
GB
United Kingdom
Prior art keywords
rate
per hour
per cent
firing
atmosphere
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
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 filed Critical
Publication of GB1251988A publication Critical patent/GB1251988A/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
    • 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

Landscapes

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

Abstract

1,251,988. Ferrites. WESTERN ELECTRIC CO. Inc. 20 Nov., 1968 [21 Nov., 1967], No. 55018/68. Heading H1H. A nickel zinc cobalt ferrite having a cation content equivalent to 72-82 atom per cent Fe, 10-27 atom per cent Ni, 1-13 atom per cent Zn and 0À4-1À2 atom per cent Co is made by (1) mixing metal oxides or compounds which form the oxides on firing, (2) calcining and wet milling the mixture, (3) drying and shaping the resultant material under pressure, (4) firing the pressed material at 1100-1250‹ C., (5) cooling the product to a temperature above the Curie point (475-700‹ C.) either (a) at a rate of 400-2000‹ C. per hour in any atmosphere, or (b) at a rate of 30-400‹ C. per hour in an atmosphere containing 0À7-10% O 2 , and (6) annealing the resulting ferrite by cooling from said temperature above the Curie point at a rate of up to and including 100‹ C. per hour in an atmosphere containing at least 18% O 2 , the remainder of the atmosphere being substantially inert. After step (5), the ferrite may be quenched at a rate of 400-2000‹ C. per hour to below 400‹ C., machined, and then reheated to above the Curie point preparatory to the annealing step (6). Calcining may be carried out at 800-1100‹ C. for 2-16 hours, and the firing may last 3-12 hours. A small amount of CaO, e.g. 0À05-0À15% by wt. may be added to starting materials, which preferably contain not more than 0À04% Si. -
GB1251988D 1967-11-21 1968-11-20 Expired GB1251988A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US68462867A 1967-11-21 1967-11-21

Publications (1)

Publication Number Publication Date
GB1251988A true GB1251988A (en) 1971-11-03

Family

ID=24748859

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1251988D Expired GB1251988A (en) 1967-11-21 1968-11-20

Country Status (6)

Country Link
US (1) US3533949A (en)
BE (1) BE722747A (en)
DE (1) DE1809811B2 (en)
FR (1) FR1603507A (en)
GB (1) GB1251988A (en)
NL (1) NL148580B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5626789A (en) 1991-09-11 1997-05-06 American Research Corp. Of Virginia Ferrimagnetic core materials for megahertz frequency high flux density transformers and inductors

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL96342C (en) * 1955-10-20
US3242089A (en) * 1962-08-20 1966-03-22 Western Electric Co Heat-treating method for modifying permeability and quality factor of nickel-zinc-cobalt ferrite

Also Published As

Publication number Publication date
DE1809811B2 (en) 1971-04-29
NL6816316A (en) 1969-05-23
DE1809811A1 (en) 1969-10-09
NL148580B (en) 1976-02-16
BE722747A (en) 1969-04-01
US3533949A (en) 1970-10-13
FR1603507A (en) 1971-05-03

Similar Documents

Publication Publication Date Title
GB1143448A (en) Improvements in or relating to manganese-zinc-ferrites
GB1273419A (en) Process for producing ceramic materials
GB661721A (en) Magnetic core composition and method for producing the same
GB776710A (en) Magnetic materials of the ferrite kind
GB1266787A (en)
US3252913A (en) Method for preparing manganese-zincferrous ferrite
GB683722A (en) Ferromagnetic materials
GB906119A (en) Mixed ferrospinels
GB1251988A (en)
ES393851A1 (en) Ferrite particles for flexible permenent magnets
GB1060598A (en) Ferromagnetic cores and processes for the preparation thereof
GB763494A (en) Improvements in or relating to magnetic ferrites
GB1073237A (en) Magnetic memory core material for operation over wide temperature ranges and method for producing the same
ES394684A1 (en) A method of manufacturing a magnetic nucleus. (Machine-translation by Google Translate, not legally binding)
GB1390279A (en) Manganese-zinc ferrites
GB1271706A (en) Improvements in or relating to manganese-zinc ferrite materials
GB1227459A (en)
GB1056315A (en) Process for the manufacture of manganese-zinc ferrites
GB1029024A (en) Improvements in or relating to ferromagnetic ferrites incorporating lithium
SE301523B (en)
US3375196A (en) Method for introducing calcium oxide into manganese-zinc ferrite magnetic materials
GB1401358A (en) Production of manganese-zinc ferrite
GB1197740A (en) Process for the Production of Mixed Ferrites
GB1129390A (en) Improvements in or relating to ferroelectric switching cores
GB1057774A (en) Magnetic oxide material

Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee