EP0808078B1 - Elektrische Heizvorrichtung mit amorpher Metallegierung - Google Patents

Elektrische Heizvorrichtung mit amorpher Metallegierung Download PDF

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Publication number
EP0808078B1
EP0808078B1 EP19960107892 EP96107892A EP0808078B1 EP 0808078 B1 EP0808078 B1 EP 0808078B1 EP 19960107892 EP19960107892 EP 19960107892 EP 96107892 A EP96107892 A EP 96107892A EP 0808078 B1 EP0808078 B1 EP 0808078B1
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Prior art keywords
ribbon
temperature
electrical
alloy
ribbons
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Expired - Lifetime
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EP19960107892
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English (en)
French (fr)
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EP0808078A1 (de
Inventor
Vladimir c/o AMT Ltd. Manov
Eliezer c/o AMT Ltd. Adar
Mark c/o AMT Ltd. Geller
Evgeni c/o AMT ltd. Sorkine
Iosef c/o AMT Ltd. Margolin
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AMT Ltd
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AMT Ltd
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Publication date
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Priority to ES96107892T priority Critical patent/ES2163550T3/es
Priority to DK96107892T priority patent/DK0808078T3/da
Priority to EP19960107892 priority patent/EP0808078B1/de
Priority to DE1996615663 priority patent/DE69615663T2/de
Publication of EP0808078A1 publication Critical patent/EP0808078A1/de
Application granted granted Critical
Publication of EP0808078B1 publication Critical patent/EP0808078B1/de
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    • 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—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • 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
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional [2D] plane, e.g. plate-heater
    • H05B3/34—Heating elements having extended surface area substantially in a two-dimensional [2D] plane, e.g. plate-heater flexible, e.g. heating nets or webs
    • H05B3/36—Heating elements having extended surface area substantially in a two-dimensional [2D] plane, e.g. plate-heater flexible, e.g. heating nets or webs heating conductor embedded in insulating material
    • 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/002—Heaters using a particular layout for the resistive material or resistive elements
    • H05B2203/003—Heaters using a particular layout for the resistive material or resistive elements using serpentine layout
    • 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/014—Heaters using resistive wires or cables not provided for in H05B3/54
    • 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/017—Manufacturing methods or apparatus for heaters
    • 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/021—Heaters specially adapted for heating liquids
    • 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/022—Heaters specially adapted for heating gaseous material
    • 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/032—Heaters specially adapted for heating by radiation heating

Definitions

  • the present invention concerns electrical heater elements and systems.
  • the invention relates in particular to such systems in which the heating elements are thin ribbons made of amorphous metallic alloys having a large area and that are operated at low and moderate temperatures.
  • heating elements made of metallic wire, having a crystalline structure and a small area of contact with the surroundings. To transfer the required heat power to the surroundings, these elements are operated at a high temperature, typically 900-1500°C. This requires a relatively high- cost heater, capable of operation at these high temperatures for prolonged periods, thus having good anticorrosion properties at high temperatures.
  • Commonly used heating elements for high-temperature heaters are made of NiCr alloy, Kanthal and Fechralloy. Other materials, used at lower temperatures in the range of about 800°C, include Manganin and Constantan.
  • the high operating temperatures also create undesirable fumes and odors, for example odors arising from burning the organic dust particles in the air.
  • odors for example odors arising from burning the organic dust particles in the air.
  • These odors have a particularly unhealthy effect while the heaters are used in closed spaces, for example for domestic heating.
  • These heaters are not environment-friendly, and their widespread use creates an ecological problem.
  • a thin ribbon could be used as a heater and operated at lower temperature because of its larger surface area; unfortunately, the process of making thin ribbons or foils is very expensive, involving etching of a resistive material carried on a substrate, or repeated rolling of a wire. The resulting foil assumes a metallic a crystalline structure. In recent years, however, attention has been paid to the fabrication of thin amorphous metallic alloy ribbons, primarily for use in magnetic application. Amorphous ribbons are much cheaper to produce than crystalline ribbons. Usually the process for manufacturing amorphous ribbons involves one-stage melt spinning technology, as detailed for example in Ohno US Patent No. 4,789,022.
  • Amorphous metallic alloy ribbons are widely used in magnetic applications; these ribbons are not used at present as electrical heaters, although there are indications and comments that such an application may be possible.
  • the object is basically accomplished by providing an electrical heating element made of a ribbon of amorphous metallic alloy, and an electrical heating system including these heating elements.
  • the heating elements are made of an amorphous metallic ribbon.
  • the heating elements have a new structure and operation: the novel structure includes a large area formed by long and wide ribbons, to achieve good heat transfer to the surroundings, that is lower thermal resistance to surroundings.
  • the area of the heating elements and thus the thermal resistance is determined according to the desired thermal power, under the constraint of a low operating temperature, that is a temperature well below the embrittlement temperature of the amorphous alloy in use.
  • a low operating temperature that is a temperature well below the embrittlement temperature of the amorphous alloy in use.
  • fast heating constant that is heater reaches its steady state temperature in less time.
  • the heating element ribbons are manufactured using the process developed by V. Manov et al., that is overheating the melted (liquid) alloy before rapid quenching, to achieve more reliable heater elements with more reproducible properties.
  • the structure of the heating elements is such as to keep the operating temperature still lower, so as not to generate benzopyrene or other unhealthy or environment unfriendly fumes or gases.
  • the heating elements use lower cost alloys, that is alloys capable of withstanding oxidation only at low temperatures.
  • the electrical heating system further uses low cost insulation and support materials, that is materials intended for use at low temperatures only.
  • Fig. 1A illustrates prior art heating element 12 made of a coiled nichrome wire.
  • the wire has a crystalline structure; this is the normal state of a metal which is allowed to solidify gradually.
  • Fig. 1B shows a stove burner with heating coils 12 and 18. The two coils are embedded in ceramic plate 14, with electrical connections (not shown) to apply electric power to the heating coils.
  • Fig. 1C shows another well-known use of prior art crystalline coils for heating purpose.
  • the space heater includes case 22, two heating coils 24, 26 two reflectors 23, 25 and power switch 27.
  • Fig. 1D shows yet another prior art crystalline metallic wire for heating purposes, a hair dryer.
  • Case 32 and handle 34 are usually an integral plastic molded piece.
  • Power is extended from line cord 48, through contacts on switch 38, to wire 42 which is wound around mica frame 40.
  • the frame which must withstand high temperatures, simply serves to support the wire heating element.
  • the heating unit is contained within mica insulating sleeve 44.
  • a fan 36 at the rear of the heating element is turned by a motor (not shown) when switch 38 is turned on.
  • a good part of the cost of a conventional hair drier is attributable to the heating element 42.
  • the remaining drawings illustrate the use of amorphous ribbons as heating elements according to our invention.
  • the present invention details a new structure and operation of electrical heating systems, with heating elements which are thin ribbons made of amorphous metallic alloys having a large area and that are operated at low and moderate temperatures.
  • Fig. 2A is a perspective view, shown partially broken away, of a heating element constructed in accordance with the principles of our invention
  • Fig. 2B is a side view of the heating element, also shown partially broken away
  • Fig. 2C is a top view.
  • the heating element consists of an amorphous metallic alloy ribbon 50 mounted between two (in this case, cylindrically-shaped) plastic sheets glued, laminated or otherwise joined together as a unit 52.
  • Suitable plastics for use with the heating element of Figs. 2A-2C are polystyrene and polyamide. In general, the material encasing the ribbon should have good heat conductivity and poor electrical conductivity.
  • the ends 50a, 50b of the ribbon as shown may be attached to terminal lugs.
  • These heating elements are made of amorphous metallic alloys.
  • Amorphous ribbons have very good mechanical properties (e.g., hardness, flexibility and tensile strength), they are much cheaper to produce than crystalline ribbons, and they are easier to work with.
  • amorphous ribbons are produced using one-stage melt spinning technology.
  • a ribbon is formed from a melt which is rapidly quenched so as to "freeze" the metal atoms before they can arrange themselves in a crystalline structure.
  • Amorphous ribbons can be made in a wide range of widths thicknesses. Typical widths are 1 - 100 mm, and typical thicknesses are 20-35 microns.
  • Such amorphous ribbons have electrical resistivities which can go as high as 20E-6 ohm*m, although typically their resistivities are in the range of 1.5E-6 ohm*m, still equal to or higher than the resistivities of crystalline ribbons.
  • the first reason is that the properties of amorphous metallic ribbons are not generally reproducible in the sense that the material characteristics are not consistent from one batch to the next, and even from the start of any single ribbon to its end. Different resistivity results in different emitted heat power and is not tolerable in a standard heater for consumer use; moreover, different parts of the heater may heat to different temperatures, which may result in heater destruction and thus lower reliability of the heater system.
  • the present invention proposes the use of the Manov overheating process to achieve amorphous ribbons with reproducible characteristics.
  • an "overheating” technique was disclosed, that is that is overheating the melted (liquid) alloy to a precise temperature prior to rapid quenching, to achieve more reliable heater elements with more reproducible properties.
  • the Manov process has additional benefits, in that it also achieves ribbons having a new, different structure and a composition distribution which is significantly more uniform, both in the volume and on the surface. This results in fewer local micro-defects in the ribbon. These micro-defects are the main cause of the cracks propagation as the electrical current passes through the ribbon, which cracks in the end result in the heating element failure. So, the ribbons are more reliable in the sense that heating elements made therefrom are capable of operation for prolonged periods. It is these findings, hitherto unpublished, which justify the use of the Manov process for producing ribbons for heating elements.
  • the use of the Manov process is a novel process used in the present invention in conjunction with heaters made of amorphous metallic alloys, and solves a long felt problem which prevented widespread, practical use of these alloys as heater elements.
  • the required resistance of a heating element is readily determined.
  • the power input is equal to the square of the voltage across the heating element, divided by the resistance of the element. Since the full line voltage is usually applied across the heating element and the desired power is known (limited by the maximum current which can be drawn), the required resistance can be calculated.
  • Heaters known in the art are operated at a high temperature, between 900-1500°C, offering the benefit of small size, since a small heater can provide much heat and transfer it to the surroundings.
  • the heaters in the present invention are designed to be operated at a much lower temperature, about 50-300°C, with a preferred range of 50-200°C.
  • the low operating temperature was determined according to several considerations: the amorphous alloy ribbons become brittle at about 250-300°C (the "embrittlement” temperature), and become crystalline at a slightly higher temperature, about 350-400°C. The temperature should therefore be kept below these values.
  • the structure of the heating elements is such as to keep the operating temperature still lower, so as not to generate benzopyrene or other unhealthy or ecologically unfavorable fumes or gases.
  • the heating elements have a new structure and operation: the novel structure includes a large area formed by long and wide ribbons, to achieve good heat transfer to the surroundings, that is lower thermal resistance to surroundings.
  • the area of the heating elements and thus the thermal resistance is determined according to the desired thermal power, under the constraint of a low operating temperature, that is a temperature well below the embrittlement temperature of the amorphous alloy in use as detailed above.
  • the lower operating temperature results in less heat transfer to the surroundings, since the quantity of heat transferred is proportional to the temperature difference; to compensate for that and to achieve good transfer of all the heat power as desired, a large surface heater element is used.
  • the amorphous ribbon heating element is much more effective than the crystalline wire heating element because of the much larger heat transfer area.
  • Much more heat is transferred to the surrounding air by a ribbon than a wire whose masses are the same. Mass is a very important consideration, because it directly affects cost.
  • a crystalline ribbon costs much more than a comparable amorphous ribbon.
  • the resistance of the heating element is calculated using methods well known in the art, from the desired electrical power and the applied voltage.
  • Thermal resistance is the term used in the art to define the heat transfer property of a material or between a body and the ambient; it is defined as the temperature difference resulting from the flow of 1 Watt of thermal power.
  • a lower thermal resistance is achieved by increasing the area of the heating elements.
  • increasing the area of the heating elements results in a capability to transfer a desired thermal power to the surroundings, while the heating element is kept at a lower temperature.
  • the electrical resistance is proportional to the length of a wire or ribbon, and inversely proportional to its cross-sectional area.
  • the same electrical resistance can be achieved by using either a short and narrow ribbon, or a wide and long ribbon.
  • Ribbons known in the art for use in heating elements use a thin and short ribbon; for example, JP-112192 repeatedly describes a 10 mm wide ribbon; our use of a 200 mm wide ribbon results in a 20 times increase in width with a 20 times required increase in length to achieve the same resistance; thus the area increases 400 times, dramatically decreasing the thermal resistance to ambient, and an about 400 times reduction in the operating temperature.
  • This is an illustration of an extremely wide element, to be used for very high power or very low operating temperatures according to the present invention; more practical values for the element width are about 30 mm to 100 mm.
  • the illustration serves to demonstrate the great flexibility of the novel approach in the present invention, in which precise control of the heater area determines the operation temperature, setting it at a low value beneficial from several aspects as detailed here.
  • the heating elements use lower cost alloys, that is alloys capable of withstanding oxidation only at low temperatures, since the heating element operates only at low temperatures. Accordingly, the whole electrical heating system is cheaper to produce since it further uses low cost insulation and support materials, that is materials intended for use at low temperatures only.
  • the ribbon supporting structures in heaters of our invention may be made of Teflon, silicone, rubber, RTV, Kapton and like materials.
  • a variant of the present embodiment is provided where the ribbon is produced in a perforated form with the sizes, positions and quantity of the orifices being determined by the conditions of preventing the propagation of a crack which may appear due to any reason during the heating element operation.
  • the holes are such sized and located that any crack propagating in a straight line will meet a hole after a short distance of propagation, and stop there.
  • the heating element ribbon should be no thicker than 100 microns. In many cases, however, it can be thick enough to require no supporting substrate (while still being under 100 microns). In all cases, the ribbon thickness should be as uniform as possible.
  • Preferred alloys include one or more of iron, nickel and cobalt in the range 65-88 molar percent, one or more of boron, silicon and phosphorus in the range 12-28 molar percent, and chromium in the range 0-11 molar percent.
  • the ribbon thickness is preferably below 45 microns. Alloys used in our invention have electrical resistivities in the range 1E-6 to 1E-5 ohm*m, and preferably in the range 1-5*E-6 ohm*m.
  • Fig. 3 One use for the heating element of Figs. 2A-2C is depicted in Fig. 3, a hair dryer.
  • Case 56 and handle 58 comprise an integral molded piece, with power switch 62 in the handle controlling the flow of current from line cord 66.
  • Switch 62 controls both the heating ribbon and the motor which drives fan 60.
  • the heating element is placed within case 56.
  • Prior art dryer used a heating element made of crystalline Kanthal wire of 0.4 mm diameter, with a length of 486 cm. The device operated at 920 watts, with a wire temperature of approximately 600 °C.
  • the new heater was made of Fe80B20 material, also operated at 920 watts.
  • the ribbon thickness was 20 microns, its width was 5 mm, and its length was 388 cm.
  • the operating temperature of the ribbon heating element was measured at 100 °C, that is six times less than the operating temperature
  • the cost of the amorphous ribbon used was approximately one-half that of the wire used in the commercially available product. It will be understood that because of the lower operating temperature, it is possible to reduce the overall cost of the device still further, because there is no longer necessary to use expensive, high temperature insulating materials.
  • the space heater of Fig. 4A consists of multiple modules 64.
  • the pattern of the heating ribbon 70 is shown most clearly in Fig. 4B.
  • the ribbon terminates at two ends 70a, 70b. Only one intermediate module is shown in Fig. 4A.
  • the leftmost module includes a control knob 72 for controlling the power delivered to the heater as known in the art, as well as a line cord, as shown.
  • a control knob 72 for controlling the power delivered to the heater as known in the art, as well as a line cord, as shown.
  • hooks 66 are provided with hooks 66, as shown most clearly in Fig. 4D.
  • a button 68 When a button 68 is depressed, the hooks separate to allow their insertion into notches (not shown) of an adjacent module; when the button is released, the hooks grab corresponding pins (not shown) so that the connection remains secure.
  • Other similar connection means may be used.
  • Fig. 4C depicts the cross-section of a panel.
  • the rear of the heater panel consist of cover 76; ribbon 70 can be attached to the cover 76 if the cover is made of an insulating material.
  • the front of the module consists of an aluminum cover 73 secured to the ribbon with a layer of silicone glue 74.
  • a heater of the type shown in Figs. 4A-4D, but with only a single panel, was made using an amorphous alloy of Fe78B18Si4 material.
  • the ribbon had a thickness of 20 micron, a width of 1 cm, and a length of 10.15 m. It was attached to the aluminum plate which had an area of 0.3 m2. When operating at a power of about 500 watts, the temperature of the heating element was only 150 °C.
  • Figs. 5A and 5B depict a space heater in which the amorphous metallic ribbon is not supported by a substrate.
  • the heater consists of base 84, top cover 81 which has holes 81a, and a radiating case 78 which surrounds the heating element but includes notches 78a at the bottom. Notches 78a and holes 81a allow air to flow up, thus carrying heat by convection.
  • the heating element comprises vertically oriented insulating rods 79, around which is wound a long amorphous ribbon 80.
  • the ribbon 80 is preferably fixed by silicone glue to the rods.
  • the base includes a regulating knob 82 and line cord socket 83 of conventional design.
  • Ribbon 80 was constructed of Fe 78 B 18 Si 4 material, had a thickness of 20 micron, a width of 2 cm, and a length of 8 m. When operated at a power of about 1300 watts, the temperature of the ribbon surface did not exceed 130 °C. This heater, and the 500-watt heater discussed immediately above, were operated for over 1,000 hours. In each case the amorphous ribbon was checked by X-ray diffraction, and no changes in ribbon structure were found.
  • the space heater of Figs. 6A and 6B is similar to that of Figs. 5A and 5B with one major difference.
  • This tower-shaped heater includes the same cover 81 with holes 81a, radiating cover 78 and base 84 with knob 82 and plug socket 83.
  • a heating element of the type shown in Figs. 2A-2C is used, although the heating element used for a space heater would be larger than that used for the hair dryer of Fig. 3.
  • Ribbon 50 supported on a single plastic sheet 83, is shown in Fig. 6B, with the two ends 50a, 50b of the ribbon terminating in a central block 85.
  • Fig. 7A depicts the use of the invention for heating water in a conventional sink 87, with part of the hot water pipe being replaced by heating element 88, shown in detail in Fig. 7B.
  • the heating element consists of a copper pipe 89 through which cold water flow from the bottom and hot water exit from the top, an about 0.3 mm thick layer of silicon insulation 52, a ribbon layer 50 mounted on a plastic carrier 91 glued to layer 52, and an about 2.4 mm thick layer of mineral thermal insulation 90.
  • the water flow rate was 2kg/min
  • the input temperature of the water was 10-20 °C
  • the output temperature at the top of the pipe was 96-98 °C.
  • the pipe 89 had an inner diameter of 8 mm, an outer diameter of 10 mm, and a length of 0.5 m. Three ribbons were connected in parallel and wound around the pipe.
  • Each ribbon was 25 micron thick, 1 cm wide, and 3 m long, for a total mass of 14.5 gram.
  • the ribbon material was Fe78B18Si4 .
  • the total power was 11 kilowatts.
  • the measured temperature of the ribbon was 180 °C.
  • the hot water heater was operated for 200 hours with no complications.
  • Figs. 8A and 8B are similar to Figs. 7A and 7B and depict an alternative mechanism for heating water as it flows through a conventional pipe.
  • Heating element laminate 94 is shown in Fig. 8B, and is of the type depicted in Figs. 2A-2C.
  • Heating element 94 is placed inside pipe 89, and water flows around it as shown by arrow 95 in Fig. 8A. Here the heating element heats the water directly.

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  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Claims (9)

  1. Elektrisches Heizelement aus einem amorphen Metallegierungsband, wobei das Band einen elektrischen Widerstand gemäß der in Wärmeleistung umzuwandelnden gewünschten elektrischen Leistung aufweist und wobei das Band ferner eine Form und eine Größe aufweist, um den Wärmewiderstand zu erhalten, der erforderlich ist, um die Wärmeleistung zur Umgebung zu übertragen, wenn sich das Heizelement auf einer gewünschten Betriebstemperatur befindet, wobei die Temperatur niedriger ist als die Versprödungstemperatur der Legierung, und wobei das Band gemäß dem Manov-Verfahren hergestellt wird, bei dem die geschmolzene Legierung auf eine präzise Temperatur überhitzt wird, bevor sie rasch abgekühlt wird.
  2. Elektrisches Heizelement nach Anspruch 1, wobei die Betriebstemperatur niedriger ist als die Temperatur, bei der sich Benzopyren oder andere gesundheitsschädliche oder ökologisch nachteilige Dämpfe oder Gase bilden.
  3. Elektrisches Heizelement nach Anspruch 1, wobei die Betriebstemperatur im Bereich von 50 - 200 °C liegt.
  4. Elektrisches Heizelement nach Anspruch 1, wobei die Form und Größe des Bandes ein im allgemeinen flaches Band mit einer Dicke von weniger als 100 µm bilden und die Länge und die Breite des Bandes derart gewählt sind, daß der elektrische Widerstand und der Wärmewiderstand erhalten werden.
  5. Elektrisches Heizelement nach Anspruch 1, wobei das Band aus einer Legierung aus Fe78B18Si4 oder Fe13Ni60Cr5Si10B12 oder Fe74Co2,5Cr7,5B16 oder Al65Co10Ge25 besteht.
  6. Elektrisches Heizelement nach Anspruch 1, wobei das Band aus einer Legierung hergestellt wird, die mindestens eines der Elemente Eisen, Nickel und Kobalt in einem Anteil von 65 - 88 Mol-%, mindestens eines der Elemente Bor, Silizium und Phosphor in einem Anteil von 12 - 28 Mol-% und Chrom in einem Anteil von 0 - 11 Mol-% aufweist.
  7. Elektrisches Heizsystem mit:
    (A) mindestens einem elektrischen Heizelement nach Anspruch 1, das aus einem amorphen Metallegierungsband hergestellt ist, wobei jedes der Bänder einen elektrischen Widerstand gemäß der in Wärmeleistung umzuwandelnden gewünschten elektrischen Leistung aufweist und wobei das Band ferner eine Form und eine Größe aufweist, um den Wärmewiderstand zu erhalten, der erforderlich ist, um die Wärmeleistung zur Umgebung zu übertragen, wenn sich das Heizelement auf einer gewünschten Betriebstemperatur befindet, wobei die Temperatur niedriger ist als die Versprödungstemperatur der Legierung;
    (B) einer elektrischen Isoliereinrichtung zum Abdecken der Bänder, um einen elektrischen Schlag zu verhindern, während die Wärmeleistung übertragen wird, wobei die Isolierung aus Materialien hergestellt ist, die ausschließlich für einen Betrieb bei niedrigen Temperaturen im Bereich der Betriebstemperatur geeignet sind; und
    (C) Halteeinrichtungen zum mechanischen Halten der Bänder im Heizsystem, wobei die Halteeinrichtungen aus Materialien hergestellt sind, die ausschließlich für einen Betrieb bei niedrigen Temperaturen im Bereich der Betriebstemperatur geeignet sind.
  8. Elektrisches Heizsystem nach Anspruch 7, wobei die Isolierung ein das Band abdeckendes Kunststofflaminat aufweist.
  9. Elektrisches Heizsystem nach Anspruch 8, wobei das Kunststofflaminat aus Polystyrol oder Polyamid oder Silikon hergestellt ist.
EP19960107892 1996-05-17 1996-05-17 Elektrische Heizvorrichtung mit amorpher Metallegierung Expired - Lifetime EP0808078B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
ES96107892T ES2163550T3 (es) 1996-05-17 1996-05-17 Sistema de calentador electrico por aleacion metalica amorfa.
DK96107892T DK0808078T3 (da) 1996-05-17 1996-05-17 Amorf metallisk legering til et elektrisk varmesystem
EP19960107892 EP0808078B1 (de) 1996-05-17 1996-05-17 Elektrische Heizvorrichtung mit amorpher Metallegierung
DE1996615663 DE69615663T2 (de) 1996-05-17 1996-05-17 Elektrische Heizvorrichtung mit amorpher Metallegierung

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Application Number Priority Date Filing Date Title
EP19960107892 EP0808078B1 (de) 1996-05-17 1996-05-17 Elektrische Heizvorrichtung mit amorpher Metallegierung

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EP0808078A1 EP0808078A1 (de) 1997-11-19
EP0808078B1 true EP0808078B1 (de) 2001-10-04

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DE (1) DE69615663T2 (de)
DK (1) DK0808078T3 (de)
ES (1) ES2163550T3 (de)

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JP2005163171A (ja) * 2003-10-07 2005-06-23 Gmwt Global Micro Wire Technologies Ltd 高強度ニッケル基非晶質合金
CN101132657B (zh) 2007-09-21 2011-09-21 赵永镐 聚四氟乙烯加热制品及其制造方法
CL2014002231A1 (es) * 2014-08-22 2014-11-14 S A Ecoleed Dispositivo generador de energia termica en base a una cinta continua de metal amorfo incluida entre dos placas que pueden ser de diferentes materiales.

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JPS5913051A (ja) * 1982-07-09 1984-01-23 Matsushita Electric Ind Co Ltd 超急冷金属電気抵抗薄帯
DE3585484D1 (de) * 1984-05-23 1992-04-09 Allied Signal Inc Amorphe metallegierungen mit magnetischen eigenschaften in wechselstrom bei hohen temperaturen.
FR2616002B1 (fr) * 1987-06-01 1992-07-10 Beauferey Jean Francois Resistance electrique chauffante souple sous tissu de verre impregne de polytetrafluoroethylene

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EP0808078A1 (de) 1997-11-19
DE69615663D1 (de) 2001-11-08
ES2163550T3 (es) 2002-02-01
DE69615663T2 (de) 2002-06-20
DK0808078T3 (da) 2001-12-17

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