WO2003073792A1 - A molybdenum silicide type element. - Google Patents

A molybdenum silicide type element. Download PDF

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Publication number
WO2003073792A1
WO2003073792A1 PCT/SE2003/000278 SE0300278W WO03073792A1 WO 2003073792 A1 WO2003073792 A1 WO 2003073792A1 SE 0300278 W SE0300278 W SE 0300278W WO 03073792 A1 WO03073792 A1 WO 03073792A1
Authority
WO
WIPO (PCT)
Prior art keywords
sections
terminals
leg
legs
resistance element
Prior art date
Application number
PCT/SE2003/000278
Other languages
French (fr)
Inventor
Lars Göran JOHANSSON
Original Assignee
Sandvik Ab
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 Sandvik Ab filed Critical Sandvik Ab
Priority to US10/504,672 priority Critical patent/US7378621B2/en
Priority to JP2003572332A priority patent/JP2005519427A/en
Priority to AU2003206563A priority patent/AU2003206563A1/en
Priority to DE60324390T priority patent/DE60324390D1/en
Priority to KR10-2004-7013389A priority patent/KR20040089681A/en
Priority to EP03705613A priority patent/EP1479268B1/en
Publication of WO2003073792A1 publication Critical patent/WO2003073792A1/en

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—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
    • H05B3/148—Silicon, e.g. silicon carbide, magnesium silicide, heating transistors or diodes
    • 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
    • H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
    • 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
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • 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
    • H05B2203/018—Heaters using heating elements comprising mosi2

Definitions

  • the present invention relates to an electrical resistance element of the molybdenum silicide type.
  • Such elements have long been known in different forms with regard to their different alloy contents. Kanthal AB of Sweden are manufacturers of such elements. These types of elements are summarised as molybdenum silicide type elements, which have long been used to heat ovens and different kinds of surfaces, such as a radiating surface that radiates onto an object or cooker plates or other surfaces.
  • Molybdenum silicide elements are produced in different forms.
  • a typical form is a so-called leg element, which comprises two legs that extend between two electrical conductors or terminals at their one ends and that are joined with an arcuate or curved part at their other ends.
  • the leg elements can consist of one, two or more legs.
  • Two-legged elements or multi-leg elements include one or more curved parts that extend between the conductors.
  • the leg constitutes a glow zone, i.e.that part of the element that glows when supplied with electric current and therewith delivers heat to an object.
  • a concrete example is when liquid-metal ladles shall be pre-heated. Uneven heating of a ladle presents a problem when using resistance elements, as the bottom of the ladle will not be as hot as the inner walls of the ladle.
  • the known method of attempting to resolve this problem involves the installation of a number of elements or groups of elements that can be controlled individually so that different elements have delivered power of different high magnitudes.
  • the present invention solves the problem caused by uneven heating. Accordingly, the present invention relates to an electrical resistance element of the molybdenum silicide type that includes two terminals for the supply of electric current and at least one leg which extends between the terminals and which includes a glow zone, wherein the invention is characterised in that the glow zone has different diameters along different leg-sections.
  • FIGS 1, 2 and 3 show different two-legged elements
  • Figure 4 illustrates a four-legged element.
  • reference Lu indicates the length of the terminals
  • reference Le indicates the length of the glow zone.
  • References Lei, Le2 and Le3 indicate the length of different sections of the glow zone of the element, and reference "a" indicates a distance.
  • an electric resistance element of the present type includes two electricity supply terminals 1, 2 and two legs 3, 4, 5 which extend between the terminals and which include a glow zone.
  • the glow zone has different diameters along different sections of the leg.
  • the invention thus allows an element to be designed in accordance with the heating requirements that exist along the full extension of the element.
  • An inventive element of the kind illustrated in Figure 1 can be used in the case of the above example concerning a ladle whose bottom is not heated sufficiently in relation to the inner walls of the ladle when using a known element.
  • the inventive element has terminals having a diameter of 24 millimetres, and two legs whose upper part is 12 millimetres in diameter and a lower part which is 10 millimetres in diameter. Such an element will become hotter at its narrower, lower, part. This higher temperature will make that part of the object located close to this section of the ladle much hotter.
  • the element has two-legs with only one curved part 3 between the terminals 1, 2; see Figure 1.
  • the element has four legs, see Figure 4, or more, and includes two curved parts 4, 5 or more between the terminals 1, 2.
  • An element of the present kind may also be formed with only one leg, for example with a straight leg that has a terminal at each end.
  • Figure 2 illustrates an embodiment in which the glow zones have mutually different diameters along different sections 6, 7, 8 of the legs, where the diameters of respective sections become smaller with increasing distances of the sections 6, 7, 8 from the terminals 1, 2.
  • Figure 3 illustrates an embodiment in which the glow zone has mutually different diameters along different sections 9, 10, 11 of the legs 3, where the diameter of the sections varies downwards and upwards along the legs.
  • the same design can, of course, be given to elements that have two or more legs.
  • the sections 9 and 11 have a diameter of 10 millimetres and the section 10 has a diameter of 12 millimetres.
  • the glow zone will preferably have different diameters along different leg sections, wherein the diameter of respective sections is smaller the closer the sections are to the terminals.
  • the sections 12, 13 have a diameter of 8 millimetres while the sections 14 - 17 have a diameter of 9 millimetres.
  • the element may include two or more legs where one, two or more legs, or parts thereof, define an angle with a plane in which the terminals lie.
  • the elements may be designed to heat a volume in a known manner, or to form a radiating surface. Moreover, the elements may be designed, and possibly supported, for mounting vertically, horizontally or at another angle to the horizontal plane.

Landscapes

  • Resistance Heating (AREA)
  • Electrodes Of Semiconductors (AREA)
  • Ceramic Products (AREA)
  • Silicon Compounds (AREA)

Abstract

The present invention relates to an electrical resistance element of the molybdenum silicide type that includes two terminals (1, 2) for the supply of electric current and at least one leg (3) which extends between the terminals and which includes a glow zone.The invention is characterised in that the glow zone has different diameters along different sections (6 - 11, 14 - 17) of the leg (3; 4, 5).

Description

A MOLYBDENUM SILICIDE TYPE ELEMENT
The present invention relates to an electrical resistance element of the molybdenum silicide type.
Such elements have long been known in different forms with regard to their different alloy contents. Kanthal AB of Sweden are manufacturers of such elements. These types of elements are summarised as molybdenum silicide type elements, which have long been used to heat ovens and different kinds of surfaces, such as a radiating surface that radiates onto an object or cooker plates or other surfaces.
Molybdenum silicide elements are produced in different forms. A typical form is a so- called leg element, which comprises two legs that extend between two electrical conductors or terminals at their one ends and that are joined with an arcuate or curved part at their other ends. The leg elements can consist of one, two or more legs. Two-legged elements or multi-leg elements include one or more curved parts that extend between the conductors. The leg constitutes a glow zone, i.e.that part of the element that glows when supplied with electric current and therewith delivers heat to an object.
One problem experienced with industrial furnaces, ovens and the like resides sometimes in the difficulty of maintaining a sufficiently uniform temperature distribution in a furnace space, or in achieving sufficiently uniform thermal radiation from a radiating surface. An uneven temperature distribution or uneven radiation will mean that the space or the object to be heated will not be heated uniformly, which can be highly problematic.
A concrete example is when liquid-metal ladles shall be pre-heated. Uneven heating of a ladle presents a problem when using resistance elements, as the bottom of the ladle will not be as hot as the inner walls of the ladle.
The known method of attempting to resolve this problem involves the installation of a number of elements or groups of elements that can be controlled individually so that different elements have delivered power of different high magnitudes.
The present invention solves the problem caused by uneven heating. Accordingly, the present invention relates to an electrical resistance element of the molybdenum silicide type that includes two terminals for the supply of electric current and at least one leg which extends between the terminals and which includes a glow zone, wherein the invention is characterised in that the glow zone has different diameters along different leg-sections.
The invention will now be described in more detail, partly with reference to the embodiments of the invention shown in the accompanying drawings, in which
Figures 1, 2 and 3 show different two-legged elements, and
Figure 4 illustrates a four-legged element.
The respective measurements of certain parts of the elements have been shown in the drawings for the sake of clarity. It will be understood, however, that these measurements have been given only by way of example, hi the Figures, reference Lu indicates the length of the terminals and reference Le indicates the length of the glow zone. References Lei, Le2 and Le3 indicate the length of different sections of the glow zone of the element, and reference "a" indicates a distance.
According to one embodiment, an electric resistance element of the present type includes two electricity supply terminals 1, 2 and two legs 3, 4, 5 which extend between the terminals and which include a glow zone.
According to the present invention, the glow zone has different diameters along different sections of the leg.
This means that the heat developed will differ in magnitude along different sections of the element, due to the disparity in the amperage or current intensity in each applicable cross- sectional area of the element. The invention thus allows an element to be designed in accordance with the heating requirements that exist along the full extension of the element.
An inventive element of the kind illustrated in Figure 1 can be used in the case of the above example concerning a ladle whose bottom is not heated sufficiently in relation to the inner walls of the ladle when using a known element. The inventive element has terminals having a diameter of 24 millimetres, and two legs whose upper part is 12 millimetres in diameter and a lower part which is 10 millimetres in diameter. Such an element will become hotter at its narrower, lower, part. This higher temperature will make that part of the object located close to this section of the ladle much hotter.
According to one embodiment of the invention, the element has two-legs with only one curved part 3 between the terminals 1, 2; see Figure 1.
According to another embodiment of the invention, the element has four legs, see Figure 4, or more, and includes two curved parts 4, 5 or more between the terminals 1, 2.
An element of the present kind may also be formed with only one leg, for example with a straight leg that has a terminal at each end.
Figure 2 illustrates an embodiment in which the glow zones have mutually different diameters along different sections 6, 7, 8 of the legs, where the diameters of respective sections become smaller with increasing distances of the sections 6, 7, 8 from the terminals 1, 2.
Figure 3 illustrates an embodiment in which the glow zone has mutually different diameters along different sections 9, 10, 11 of the legs 3, where the diameter of the sections varies downwards and upwards along the legs. The same design can, of course, be given to elements that have two or more legs. In the Figure 3 embodiment, the sections 9 and 11 have a diameter of 10 millimetres and the section 10 has a diameter of 12 millimetres.
In the case of certain applications, the glow zone will preferably have different diameters along different leg sections, wherein the diameter of respective sections is smaller the closer the sections are to the terminals. In the Figure 4 embodiment, the sections 12, 13 have a diameter of 8 millimetres while the sections 14 - 17 have a diameter of 9 millimetres. Although only flat elements are shown in the Figures, it will be understood that the element may include two or more legs where one, two or more legs, or parts thereof, define an angle with a plane in which the terminals lie.
The elements may be designed to heat a volume in a known manner, or to form a radiating surface. Moreover, the elements may be designed, and possibly supported, for mounting vertically, horizontally or at another angle to the horizontal plane.
The different embodiments illustrated in the drawings are, of course, exemplifying embodiments with regard to shape and diameters. As will be obvious to those skilled in this art, elements can be given generally any shape and form, with mutually different diameters that provide the heating effect desired for a particular application. The present invention is therefor not limited to any particular element design, as long as different sections have different diameters.
The present invention shall not therefore be considered to be restricted to the described and illustrated embodiments, since variations and modifications can be made within the scope of the accompanying claims.

Claims

Claims
1. An electrical resistance element of the molybdenum silicide type that includes two terminals (1, 2) for the supply of electric current and at least one leg (3) which extends between the terminals and which includes a glow zone, characterised in that the glow zone has different diameters along different sections (6-11, 14 - 17) of the leg (3; 4, 5).
2. Resistance element according to Claim 1, characterised in that the element has two legs and only one curved part (3) between the terminals (1, 2).
3. Resistance element according to Claim 1, characterised in that the element has three or more legs and two or more curved parts (4, 5) between the terminals (1,2).
4. Resistance element according to Claim 1,2 or 3, characterised in that the element has one leg (3), two legs (4, 5) or more legs, wherein one, two or more legs or parts thereof define an angle with a plane in which the terminals (1,2) lie.
5. Resistance element according to Claim 1,2, 3, or4characterisedin that the glow zone has different diameters along different sections (6 - 8) of the leg, wherein the diameters of said sections are smaller the further away from the terminals (1,2) respective sections (6 - 8) are located.
6. Resistance element according to Claim 1, 2, 3, or 4 c h a r a c t e r i s e d in that the glow zone has different diameters along different sections (14 - 17) of the leg (4, 5), wherein the diameters of said sections are smaller the nearer said sections are to the terminals (1,2).
7. Resistance element according to Claim 1,2, 3, or4characterisedin that the glow zone has different diameters along different sections (9 — 11) of the leg (3), wherein the diameters of said sections vary downwards and upwards along the leg or legs.
PCT/SE2003/000278 2002-02-27 2003-02-20 A molybdenum silicide type element. WO2003073792A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US10/504,672 US7378621B2 (en) 2002-02-27 2003-02-20 Molybdenum silicide type element
JP2003572332A JP2005519427A (en) 2002-02-27 2003-02-20 Molybdenum silicide type element
AU2003206563A AU2003206563A1 (en) 2002-02-27 2003-02-20 A molybdenum silicide type element.
DE60324390T DE60324390D1 (en) 2002-02-27 2003-02-20 ELEMENT OF THE MOLYBDEN SILICIDE TYPE
KR10-2004-7013389A KR20040089681A (en) 2002-02-27 2003-02-20 A molybdenum silicide type element
EP03705613A EP1479268B1 (en) 2002-02-27 2003-02-20 A molybdenum silicide type element.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0200587-4 2002-02-27
SE0200587A SE522581C2 (en) 2002-02-27 2002-02-27 Molybdenum silicide type element

Publications (1)

Publication Number Publication Date
WO2003073792A1 true WO2003073792A1 (en) 2003-09-04

Family

ID=20287099

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2003/000278 WO2003073792A1 (en) 2002-02-27 2003-02-20 A molybdenum silicide type element.

Country Status (10)

Country Link
US (1) US7378621B2 (en)
EP (1) EP1479268B1 (en)
JP (1) JP2005519427A (en)
KR (1) KR20040089681A (en)
CN (1) CN100450315C (en)
AT (1) ATE413083T1 (en)
AU (1) AU2003206563A1 (en)
DE (1) DE60324390D1 (en)
SE (1) SE522581C2 (en)
WO (1) WO2003073792A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009090116A2 (en) * 2008-01-18 2009-07-23 Michels Bernhard J Heating element of a heating comb for producing a honeycomb material
DE202008005084U1 (en) 2008-04-11 2009-08-13 Christoph von Zeschau Gesellschaft mit beschränkter Haftung Electric surface heater
CN108028199A (en) * 2015-10-05 2018-05-11 美科股份有限公司 Improve the substrate heating equipment of temperature deviation characteristic

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103493586B (en) * 2011-04-27 2015-11-25 京瓷株式会社 Heater and there is the glow plug of this heater
JP5508487B2 (en) * 2012-08-23 2014-05-28 株式会社リケン Tubular heater module
KR102173541B1 (en) * 2013-06-14 2020-11-03 샌드빅 가부시키가이샤 Molybdenum disilicide-based ceramic heating element holding structure
JP5986136B2 (en) * 2014-04-30 2016-09-06 Ｊｘ金属株式会社 Method for manufacturing MoSi2 heating element

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB834739A (en) * 1957-04-12 1960-05-11 Kanthal Ab Improvements in or relating to the manufacture of electric resistance elements
US3269806A (en) * 1961-11-09 1966-08-30 Siemens Planiawerke Ag Sintered resistance body, preferably for use as heating element
US3373239A (en) * 1964-06-18 1968-03-12 Siemens Planiawerke Ag High-temperature electric furnace with molybdenum silicide heater elements
US4267435A (en) * 1979-08-23 1981-05-12 The Kanthal Corporation Electric resistance heating element
US4720624A (en) * 1983-09-20 1988-01-19 Doryokuro Kakunenryo Kaihatsu Jigyodan Non-uniform resistance heating tubes
GB2332844A (en) * 1997-12-29 1999-06-30 Jonathan Patrick Leech Infra-red heaters and elements therefor

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2032303U (en) * 1987-09-30 1989-02-08 天津市硅酸盐研究所 Qqick temp.-raising molybdenum silicide high-temp. electric stove

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB834739A (en) * 1957-04-12 1960-05-11 Kanthal Ab Improvements in or relating to the manufacture of electric resistance elements
US3269806A (en) * 1961-11-09 1966-08-30 Siemens Planiawerke Ag Sintered resistance body, preferably for use as heating element
US3373239A (en) * 1964-06-18 1968-03-12 Siemens Planiawerke Ag High-temperature electric furnace with molybdenum silicide heater elements
US4267435A (en) * 1979-08-23 1981-05-12 The Kanthal Corporation Electric resistance heating element
US4720624A (en) * 1983-09-20 1988-01-19 Doryokuro Kakunenryo Kaihatsu Jigyodan Non-uniform resistance heating tubes
GB2332844A (en) * 1997-12-29 1999-06-30 Jonathan Patrick Leech Infra-red heaters and elements therefor

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009090116A2 (en) * 2008-01-18 2009-07-23 Michels Bernhard J Heating element of a heating comb for producing a honeycomb material
WO2009090116A3 (en) * 2008-01-18 2009-11-12 Michels Bernhard J Heating element of a heating comb for producing a honeycomb material
DE202008005084U1 (en) 2008-04-11 2009-08-13 Christoph von Zeschau Gesellschaft mit beschränkter Haftung Electric surface heater
EP2109343A2 (en) 2008-04-11 2009-10-14 Christoph von Zeschau GmbH Electric surface heater
CN108028199A (en) * 2015-10-05 2018-05-11 美科股份有限公司 Improve the substrate heating equipment of temperature deviation characteristic
US11133202B2 (en) 2015-10-05 2021-09-28 Mico Ceramics Ltd. Substrate heating apparatus with enhanced temperature uniformity characteristic

Also Published As

Publication number Publication date
SE0200587D0 (en) 2002-02-27
DE60324390D1 (en) 2008-12-11
AU2003206563A1 (en) 2003-09-09
EP1479268B1 (en) 2008-10-29
CN1631055A (en) 2005-06-22
US7378621B2 (en) 2008-05-27
US20050184057A1 (en) 2005-08-25
SE522581C2 (en) 2004-02-17
CN100450315C (en) 2009-01-07
ATE413083T1 (en) 2008-11-15
SE0200587L (en) 2003-08-28
KR20040089681A (en) 2004-10-21
JP2005519427A (en) 2005-06-30
EP1479268A1 (en) 2004-11-24

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