GB484700A - Improvements in and relating to electrical resistances - Google Patents

Improvements in and relating to electrical resistances

Info

Publication number
GB484700A
GB484700A GB24493/36A GB2449336A GB484700A GB 484700 A GB484700 A GB 484700A GB 24493/36 A GB24493/36 A GB 24493/36A GB 2449336 A GB2449336 A GB 2449336A GB 484700 A GB484700 A GB 484700A
Authority
GB
United Kingdom
Prior art keywords
granules
coating
silica
silicon carbide
voltage
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
GB24493/36A
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.)
Electric Service Supplies Co
Original Assignee
Electric Service Supplies Co
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 Electric Service Supplies Co filed Critical Electric Service Supplies Co
Publication of GB484700A publication Critical patent/GB484700A/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
    • H01C7/10—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 voltage responsive, i.e. varistors
    • H01C7/105—Varistor cores
    • H01C7/118—Carbide, e.g. SiC type

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermistors And Varistors (AREA)

Abstract

484,700. Resistances. ELECTRIC SERVICE SUPPLIES CO. Sept. 8, 1936, No. 24493. Convention date, Sept. 23, 1935. [Class 37] [Also in Groups XI and XXXV] A resistance material comprises silicon carbide with a surface coating of metallic oxide consisting principally of silica. The coating is preferably a porous surface coating produced by roasting and tumbling silica carbide granules under oxidation conditions with an oxidizing substance such as iron, lead or nickel oxides. Excessive roasting may result in a surface glaze, which is less advantageous than the porous coating. The silicon carbide may be used in the form of closely compacted granules or the granules may be united to form rods &c. by using suitable binders of ceramic, organic or other material. The amount of silica, silicon and free carbon present on the surface of the granules is kept within stated limits. The resistance material is suitable for use as a lightning arrester, in which case it is connected in series with a spark gap or gaps arranged as in U.S.A. Specification 1,763,667, or it may be used as a voltage equalizer, voltage divider, surge absorber or damping element, or as an electric heating element. The dynamic failure voltage of the silicon carbide and its impedance voltage drop are respectively increased and decreased by the coating of oxide on the granules.
GB24493/36A 1935-09-23 1936-09-08 Improvements in and relating to electrical resistances Expired GB484700A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US484700XA 1935-09-23 1935-09-23

Publications (1)

Publication Number Publication Date
GB484700A true GB484700A (en) 1938-05-09

Family

ID=21954761

Family Applications (1)

Application Number Title Priority Date Filing Date
GB24493/36A Expired GB484700A (en) 1935-09-23 1936-09-08 Improvements in and relating to electrical resistances

Country Status (1)

Country Link
GB (1) GB484700A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1111274B (en) * 1959-02-13 1961-07-20 Janos Kemeny Voltage dependent resistor and method and apparatus for its manufacture

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1111274B (en) * 1959-02-13 1961-07-20 Janos Kemeny Voltage dependent resistor and method and apparatus for its manufacture

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