GB442348A - Improvements in electric resistances having a negative temperature coefficient - Google Patents

Improvements in electric resistances having a negative temperature coefficient

Info

Publication number
GB442348A
GB442348A GB16619/35A GB1661935A GB442348A GB 442348 A GB442348 A GB 442348A GB 16619/35 A GB16619/35 A GB 16619/35A GB 1661935 A GB1661935 A GB 1661935A GB 442348 A GB442348 A GB 442348A
Authority
GB
United Kingdom
Prior art keywords
silicon
temperature coefficient
negative temperature
electric resistances
ceramic material
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
GB16619/35A
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
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 filed Critical Philips Gloeilampenfabrieken NV
Publication of GB442348A publication Critical patent/GB442348A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/08—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/08—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag
    • F28D7/082—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag with serpentine or zig-zag configuration
    • F28D7/085—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag with serpentine or zig-zag configuration in the form of parallel conduits coupled by bent portions
    • F28D7/087—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag with serpentine or zig-zag configuration in the form of parallel conduits coupled by bent portions assembled in arrays, each array being arranged in the same plane
    • 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
    • H01B1/14—Conductive material dispersed in non-conductive inorganic material
    • H01B1/18—Conductive material dispersed in non-conductive inorganic material the conductive material comprising carbon-silicon compounds, carbon or silicon

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Silicon Compounds (AREA)
  • Ceramic Products (AREA)

Abstract

An electric resistance whose value at a temperature of 600 DEG C is more than a hundred times smaller than its value at room temperature is made by sintering a mixture of ceramic material and silicon in an inert or reducing atmosphere, the quantity by weight of silicon being larger than that of the ceramic material. Substances such as ferrosilicon containing the requisite quantity of uncombined silicon may be used instead of pure silicon. In an example, ferrosilicon containing 90 to 95 per cent silicon is made into a paste with clay and tragacanth, pressed into rods and sintered at 1300 DEG C. in a reducing atmosphere.
GB16619/35A 1934-08-31 1935-06-07 Improvements in electric resistances having a negative temperature coefficient Expired GB442348A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE442348X 1934-08-31

Publications (1)

Publication Number Publication Date
GB442348A true GB442348A (en) 1936-02-06

Family

ID=6522263

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16619/35A Expired GB442348A (en) 1934-08-31 1935-06-07 Improvements in electric resistances having a negative temperature coefficient

Country Status (2)

Country Link
FR (1) FR442348A (en)
GB (1) GB442348A (en)

Also Published As

Publication number Publication date
FR442348A (en) 1912-08-29

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