GB649985A - Improvements in or relating to the manufacture of electrically semi-conductive material - Google Patents

Improvements in or relating to the manufacture of electrically semi-conductive material

Info

Publication number
GB649985A
GB649985A GB318/48A GB31848A GB649985A GB 649985 A GB649985 A GB 649985A GB 318/48 A GB318/48 A GB 318/48A GB 31848 A GB31848 A GB 31848A GB 649985 A GB649985 A GB 649985A
Authority
GB
United Kingdom
Prior art keywords
per cent
mol
produce
resistances
manufacture
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
GB318/48A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Philips Electronics 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
Application filed by Philips Gloeilampenfabrieken NV, Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB649985A publication Critical patent/GB649985A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/04—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having negative temperature coefficient
    • H01C7/042—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having negative temperature coefficient mainly consisting of inorganic non-metallic substances
    • H01C7/043—Oxides or oxidic compounds
    • H01C7/046—Iron oxides or ferrites
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/06—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances
    • H01B1/08—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances oxides
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
    • H01C17/30—Apparatus or processes specially adapted for manufacturing resistors adapted for baking
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/001—Mass resistors

Abstract

649,985. Non-metal resistances; temperature variable resistances. PHILIPS ELECTRICAL, Ltd. Jan. 5, 1948, No. 318. Convention date, Jan. 8, 1947. [Class 37] Relates to the manufacture of semi-conductive material from metal oxides and resistances made from such material. A resistor is made by heating Fe203 with TiO2, Zr02 or Sn02 to produce mixed crystals of Fe203 and FeO with Ti02, ZrO2 or Sn02. In the given embodiment a finely powdered mixture made up of 99 mol. per cent Fe203 and 1 mol. per cent Ti02 is processed to produce rod units. The latter are heated in air at 1200‹ C., whereby a portion of the Fe203 reacts with the Ti02 to produce mixed crystals of the compounds Fe203 and FeTi03; it is stated 1 mol. per cent Ti02 gives rise to the formation of 1 mol. per cent FeO. The resistance value at 20‹ C. is 2100 ohms, and at 120‹ C. 212 ohms. To produce resistors of higher specific resistance and negative temperature coefficient the initial mixture consists of 85 mol. per cent Fe203, 1 mol. per cent Ti02 and 15 mol. per cent insulating oxide such as Cr03. The resistance value can also be varied by adding an insulating ceramic, for example 5 per cent by weight of bentonite, so that the sintered material includes a second phase. Specification 650,099 is referred to.
GB318/48A 1947-01-08 1948-01-05 Improvements in or relating to the manufacture of electrically semi-conductive material Expired GB649985A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL129683A NL78887C (en) 1947-01-08 1947-01-08

Publications (1)

Publication Number Publication Date
GB649985A true GB649985A (en) 1951-02-07

Family

ID=32389623

Family Applications (1)

Application Number Title Priority Date Filing Date
GB318/48A Expired GB649985A (en) 1947-01-08 1948-01-05 Improvements in or relating to the manufacture of electrically semi-conductive material

Country Status (4)

Country Link
US (1) US2735824A (en)
BE (1) BE479373A (en)
GB (1) GB649985A (en)
NL (1) NL78887C (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3479631A (en) * 1965-12-22 1969-11-18 Owens Illinois Inc Thermistors
US3393448A (en) * 1965-12-22 1968-07-23 Owens Illinois Inc Method for making thermistors
US3731249A (en) * 1969-09-26 1973-05-01 Univ Yeshiva Polyconducting device and applications therefor
GB1448989A (en) * 1972-12-13 1976-09-08 Nat Res Dev Coated substrates for use as corrosion resistant electrodes for electrochemical use
DE2919273C2 (en) * 1979-05-12 1982-10-28 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Arrangement for inertia-free or particularly fast temperature measurement

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US648518A (en) * 1899-09-16 1900-05-01 Karl Ochs Electrical resistance.
US2027277A (en) * 1929-08-16 1936-01-07 Habann Erich Contact device
US2258646A (en) * 1939-05-17 1941-10-14 Bell Telephone Labor Inc Resistance material
US2376757A (en) * 1943-07-12 1945-05-22 Chanosky Adolph Electrical resistor
US2590893A (en) * 1949-09-20 1952-04-01 Paul H Sanborn Insulator

Also Published As

Publication number Publication date
US2735824A (en) 1956-02-21
NL78887C (en) 1954-11-15
BE479373A (en) 1948-07-06

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