EP0015234B1 - Chauffe-plats chauffé électriquement - Google Patents

Chauffe-plats chauffé électriquement Download PDF

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Publication number
EP0015234B1
EP0015234B1 EP80810030A EP80810030A EP0015234B1 EP 0015234 B1 EP0015234 B1 EP 0015234B1 EP 80810030 A EP80810030 A EP 80810030A EP 80810030 A EP80810030 A EP 80810030A EP 0015234 B1 EP0015234 B1 EP 0015234B1
Authority
EP
European Patent Office
Prior art keywords
aluminium
thermally sprayed
aluminum
oxide
layer
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
EP80810030A
Other languages
German (de)
English (en)
Other versions
EP0015234A1 (fr
Inventor
Herbert Zulauf
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.)
Alcan Holdings Switzerland AG
Original Assignee
Schweizerische Aluminium AG
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 Schweizerische Aluminium AG filed Critical Schweizerische Aluminium AG
Priority to AT80810030T priority Critical patent/ATE3353T1/de
Publication of EP0015234A1 publication Critical patent/EP0015234A1/fr
Application granted granted Critical
Publication of EP0015234B1 publication Critical patent/EP0015234B1/fr
Expired legal-status Critical Current

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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
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/70—Plates of cast metal

Definitions

  • the invention relates to an electrically heated hotplate, in particular a hotplate, with an upper contact surface and a body made of an aluminum alloy.
  • DE-AS 26 51 883 discloses an electric hotplate with a body made of aluminum.
  • the contact surface of this hotplate is formed by a thermally sprayed-on first layer made of aluminum and a second layer containing a metal arranged thereon.
  • This second layer can consist of a heat-resistant lacquer - optionally with the addition of metal oxide - or of nickel.
  • the known hotplate is intended to prevent corrosive media from penetrating to the surface of the mass body, so that the original surface finish is retained even after a long period of use.
  • the inventor has now set himself the task of creating an electrically heated hot plate with a body made of an aluminum alloy, the contact surface of which has great hardness, high wear resistance (abrasion and notched impact strength) and is corrosion-resistant.
  • the mass body a thermally sprayed intermediate layer of aluminum or a nickel-aluminum alloy is adhered with an aluminum content of 20 to 40%, to which the contact area a 100 to 400 I Lm thick top layer of at least one oxide compound of aluminum is thermally sprayed, or that, as a contact area with an oxide compound of aluminum and 5 to 40% metallic aluminum is thermally sprayed on the mass body a 100 to 400 I Lm thick topsheet as a cermet layer at least.
  • Aluminum alloys are relatively soft materials and, when heated to temperatures above about 400 ° C, show a drastic drop in Brinell hardness in the order of 300 MN / m 2 . Aluminum alloys per se therefore appear unsuitable as materials for the heat transfer medium of hot plates, since they do not meet the requirements placed on the heating surface of a hot plate with regard to hardness and wear resistance.
  • the top layer which is sprayed on thermally, ie by plasma or flame spraying, eliminates this lack of strength and leads to a heating surface that is resistant to mechanical damage.
  • the thermally sprayed top layer can exclusively contain aluminum oxide (A1 2 0 3 ) as oxide compounds.
  • Colored oxide compounds of aluminum of the spinel type (MeA1 2 0 4 ), such as cobalt aluminum oxide (CoA1 2 0 4 ), can additionally achieve a decorative effect, the upper layer as an oxide compound, depending on the desired color intensity, a mixture of aluminum oxide and colored oxide compounds of aluminum or can only contain colored oxide compounds of aluminum.
  • the thickness of the thermally sprayed top layer is preferably between 150 and 250 I Lm.
  • An alloy that is particularly suitable for die casting has the following composition:
  • this alloy which is processed in the die casting process, in particular in the vacuum die casting process, can completely prevent the bubble formation which occurs in conventional die casting alloys at temperatures above about 400 ° C.
  • the thermally sprayed oxide layer can be ground or polished to reduce its roughness. In order to prevent undesired penetration of foreign substances into the slightly porous layer, it can also be sealed in a known manner - for example by means of boric acid or phosphoric acid solutions.
  • the core can also be equipped with a temperature sensor that limits the maximum temperature to approximately 450 ° C.
  • the advantages achieved by the heating plate according to the invention can essentially be seen in the fact that, in comparison to corresponding devices with heat carriers made of gray cast iron, rapid or fine regulation of the amount of heat to be transferred to the object to be heated is possible and energy losses as a result of the heat capacity of the heat carrier are considerable can be reduced.
  • An upper layer 2 made of aluminum oxide compounds - optionally with a proportion of metallic aluminum - is thermally sprayed onto the mass body 1 of a hotplate according to FIG. 1 at the contact surface to be brought into contact with the object to be heated.
  • a metallic intermediate layer 3 is directly thermally sprayed onto the bulk body 1 formed from an aluminum alloy as a carrier for the top layer 2 which is thermally sprayed on.
  • channels 4 in the mass body for receiving heating conductors 5.
  • the channels 4 can be arranged concentrically or spirally.
  • the heating conductors 5 are embedded in the channels 4 with a heat-resistant cement.
  • the mass body 1 was produced.
  • the diameter of the body 1 equipped with the flat contact surface or heating surface was 15 cm here.
  • cermet layer consisting of 85% cobalt aluminum oxide (CoA1 2 0 4 ) and 15% aluminum was applied to the heating surface using the plasma spray process. The surface was then briefly sanded.
  • the thermal shock resistance of the sprayed-on layer was checked by cyclical heating to 450 ° C. and letting it cool to 50 ° C. After 300 cycles, no signs of a decrease in the adhesive strength or flaking of the layer were observed.

Landscapes

  • Coating By Spraying Or Casting (AREA)
  • Baking, Grill, Roasting (AREA)
  • Cookers (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Gloves (AREA)
  • Power Steering Mechanism (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)

Claims (6)

1. Chauffe-plats chauffé électriquement en particulier plaque-chauffante, avec surface supérieure de réception et corps massique en alliage d'aluminium, caractérisé en ce qu'au corps massique (1) adhère une couche intermédiaire (3), projetée thermiquement, d'aluminium ou d'un alliage nickel aluminium d'une teneur en aluminium de 20 à 40 %, sur laquelle est projetée thermiquement, comme surface de réception, une couche supérieure (2) d'épaisseur 100 à 400 microns formée d'au moins un composé oxydé de l'aluminium. '"
2. Chauffe-plats chauffé électriquement en particulier plaque-chauffante, avec surface supérieure de réception et corps massique en alliage d'aluminium, caractérisé en ce que, comme surface de réception, on projette thermiquement sur le corps massique (1) une couche supérieure (2) d'épaisseur 100 à 400 microns, comme couche cermet (métal céramique), comportant au moins un composé oxydé de l'aluminium et 5 à 40 % d'aluminium métallique.
3. Chauffe-plats selon l'une quelconque des revendications 1 ou 2, caractérisé en ce que la couche supérieure projetée thermiquement (2) contient un oxyde d'aluminium.
4. Chauffe-plats selon l'une quelconque des revendications 1 ou 2, caractérisé en ce que la couche supérieure projetée thermiquement (2) contient des composés oxydés colorés d'aluminium du type spinelle, de préférence de l'oxyde de cobalt et d'aluminium.
5. Chauffe-plats selon l'une quelconque des revendications 1 ou 2, caractérisé en ce que la couche supérieure projetée thermiquement (2) contient un mélange d'oxyde d'aluminium et de composés oxydés colorés de l'aluminium.
6. Chauffe-plats selon l'une quelconque des revendications 1 ou 2, caractérisé en ce que le corps massique (1) est constitué de 1,0 à 2,0 %, de préférence 1,2 à 1,4 % de manganèse et de 0,5 à 1,0 %, de préférence 0,6 à 0,8 % de fer et d'un solde essentiellement en aluminium.
EP80810030A 1979-02-22 1980-01-29 Chauffe-plats chauffé électriquement Expired EP0015234B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80810030T ATE3353T1 (de) 1979-02-22 1980-01-29 Elektrisch beheizte waermeplatte.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH177279 1979-02-22
CH1772/79 1979-02-22

Publications (2)

Publication Number Publication Date
EP0015234A1 EP0015234A1 (fr) 1980-09-03
EP0015234B1 true EP0015234B1 (fr) 1983-05-11

Family

ID=4218229

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80810030A Expired EP0015234B1 (fr) 1979-02-22 1980-01-29 Chauffe-plats chauffé électriquement

Country Status (5)

Country Link
EP (1) EP0015234B1 (fr)
AT (1) ATE3353T1 (fr)
DE (2) DE2913820A1 (fr)
DK (1) DK59280A (fr)
ES (1) ES488463A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3020676A1 (de) * 1980-05-30 1981-12-03 Gerhart 7000 Stuttgart Leuze Ueberzug fuer die heizflaeche von heizkoerpern und verfahren zu dessen herstellung
EP0218705A4 (fr) * 1985-04-15 1987-07-30 Email Ltd Element chauffant.
GB9010833D0 (en) * 1990-05-15 1990-07-04 Electrotech Research Limited Workpiece support
DE19845102A1 (de) * 1998-09-30 2000-04-06 Bsh Bosch Siemens Hausgeraete Kontaktwärmeübertragendes elektrisches Kochsystem

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH195903A (de) * 1938-07-04 1938-02-28 Kummler & Matter Ag Elektrische Hochleistungskochplatte.
US3132229A (en) * 1959-07-20 1964-05-05 Gen Motors Corp Electric hot plate
DE2604924C2 (de) * 1976-02-09 1978-02-02 Leuze, Gerhart, 70O0 Stuttgart Elektrische Kochplatte
DE2651833A1 (de) * 1976-11-13 1978-05-18 Gerhart Leuze Elektrische kochplatten

Also Published As

Publication number Publication date
ATE3353T1 (de) 1983-05-15
DK59280A (da) 1980-08-23
DE3063005D1 (en) 1983-06-16
EP0015234A1 (fr) 1980-09-03
ES488463A1 (es) 1980-10-01
DE2913820A1 (de) 1980-08-28

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