EP0050612A1 - Element de production de chaleur resistant et son procede de fabrication - Google Patents

Element de production de chaleur resistant et son procede de fabrication

Info

Publication number
EP0050612A1
EP0050612A1 EP19800901090 EP80901090A EP0050612A1 EP 0050612 A1 EP0050612 A1 EP 0050612A1 EP 19800901090 EP19800901090 EP 19800901090 EP 80901090 A EP80901090 A EP 80901090A EP 0050612 A1 EP0050612 A1 EP 0050612A1
Authority
EP
European Patent Office
Prior art keywords
calcium
alumina
heat generating
generating element
silicate
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.)
Withdrawn
Application number
EP19800901090
Other languages
German (de)
English (en)
Inventor
Jeoung Kyu Lee
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0050612A1 publication Critical patent/EP0050612A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • 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

Definitions

  • the present invention relates to a heat generating element which depends on electrical contact resistance and to a method of manufacturing such an element.
  • resistive heat generating elements have been made of carbon particles. These carbon particles have been disadvantageous in that the temperature control is difficult when a space between electrodes is filled with the carbon particles and an electric current is supplied for conduction.
  • An objective of the present invention is to provide a method for manufacturing a heat generating element which is capable of eliminating this disadvantage.
  • the method comprises a first step of carbonizing a plant and pulverizing the carbonized plant to obtain fine particles.
  • a second step is mixing and kneading said fined particles of the carbonized plant with fine particles of a non-organic heat resistant fine material which provides electrical insulation at low temperatures and serves as a conductor or a semi-conductor at high temperatures.
  • a binder is provided which can be carbonized. Sintering of the kneaded lumps then takes place followed by cooling. The lumps are then pulverized.
  • the non-organic heat resisting material can be a metallic compound such as calcium dihydnogenphosphate, calcium hydrozide, calcium oxide, calcium carbide, calcium silicate, alumina, molten alumina, D soda alumina, alumina white, alumina silicate, alumina oxide, compound silicate, silicon nitride, zeolite, tungsten compounds, boron compounds (for example, borax, boron nitride and boron carbide), zirconium, zirconium oxide, etc.
  • a metallic compound such as calcium dihydnogenphosphate, calcium hydrozide, calcium oxide, calcium carbide, calcium silicate, alumina, molten alumina, D soda alumina, alumina white, alumina silicate, alumina oxide, compound silicate, silicon nitride, zeolite, tungsten compounds, boron compounds (for example, borax, boron nitride and boron carbide), zirconium
  • charcoal particles having a grain size of 500 mesh and 1 part of zirconium having a grain size of 500 mesh are mixed together.
  • This mixture is sintered at 1,800°C for an hour after having been kneaded with a solution consisting of 0.5 parts of polyvinyl alcohol and 2 parts of water. It is then pulverized, after having been cooled, to obtain heat generating elements of 0.5 to 1 mm in size.
  • the heat generating element obtained by the method according to the present invention has the characteristics described above and, therefore, the following effects can be expected.
  • the heat generating element obtained comprises carbon particles and non-organic heat resisting material, and this non-organic heat resisting material provides electric insulation until the temperature of the heat generating element reaches the predetermined high temperature value and service as a semi-conductor or a conductor once the temperature reaches the predetermined value.
  • the calorific value of the heat generating element becomes large in the high temperature region, the rate of increase of the furnace temperature will be larger in the region of high temperatures. Since the resistance of the non-organic heat resisting material is constant, subsequent variation of the resistance of the whole heat generating element will be moderate as compared with the heat generating element. made of only conventional carbon particles.
  • the heat generating element according to this method contains a non-organic heat resisting material and provides excellent heat retaining characteristics. Therefore, the element can be improved so that furnace temperature rise in the high temperature region is promoted and the voltage and current can be easily controlled since the resistance variation is moderate.

Abstract

Des elements de production de chaleur electriquement resistants sont formes en broyant des particules fines d'un materiau vegetal carbonise qui produit une isolation electrique sous une temperature predeterminee et sert de conducteur ou de semi-conducteur au-dessus de cette temperature. Le melange est fritte, refroidi puis pulverise.
EP19800901090 1980-04-30 1980-04-30 Element de production de chaleur resistant et son procede de fabrication Withdrawn EP0050612A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1980/000476 WO1981003238A1 (fr) 1980-04-30 1980-04-30 Element de production de chaleur resistant et son procede de fabrication

Publications (1)

Publication Number Publication Date
EP0050612A1 true EP0050612A1 (fr) 1982-05-05

Family

ID=22154307

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800901090 Withdrawn EP0050612A1 (fr) 1980-04-30 1980-04-30 Element de production de chaleur resistant et son procede de fabrication

Country Status (2)

Country Link
EP (1) EP0050612A1 (fr)
WO (1) WO1981003238A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2644799B1 (fr) * 1989-03-23 1991-06-21 Duchange Guy Element semi-conducteur en matiere organique
US5385785A (en) * 1993-08-27 1995-01-31 Tapeswitch Corporation Of America Apparatus and method for providing high temperature conductive-resistant coating, medium and articles

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3321727A (en) * 1964-12-09 1967-05-23 Kanthal Ab Heat-resistant and oxidationproof materials
US3965047A (en) * 1971-07-20 1976-06-22 Ernest K. Cleland Electrical resistant fluid-permeable heat generating member and method of producing the same
US3924098A (en) * 1972-04-10 1975-12-02 Bjorksten Research Lab Inc Heating element, method and composition
US4223209A (en) * 1979-04-19 1980-09-16 Raychem Corporation Article having heating elements comprising conductive polymers capable of dimensional change

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8103238A1 *

Also Published As

Publication number Publication date
WO1981003238A1 (fr) 1981-11-12

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