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WO2012076281A1 - Élément de contact électrique et contact électrique - Google Patents

Élément de contact électrique et contact électrique Download PDF

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Publication number
WO2012076281A1
WO2012076281A1 PCT/EP2011/069790 EP2011069790W WO2012076281A1 WO 2012076281 A1 WO2012076281 A1 WO 2012076281A1 EP 2011069790 W EP2011069790 W EP 2011069790W WO 2012076281 A1 WO2012076281 A1 WO 2012076281A1
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WIPO (PCT)
Prior art keywords
contact
contact element
compound
electrical contact
particles
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.)
Ceased
Application number
PCT/EP2011/069790
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English (en)
Inventor
Åke ÖBERG
Martin WÅHLANDER
Gunnar Mattsson
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.)
ABB Research Ltd Switzerland
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ABB Research Ltd Switzerland
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Filing date
Publication date
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Publication of WO2012076281A1 publication Critical patent/WO2012076281A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys

Definitions

  • the present invention relates to the field of electrical circuits, and in particular to electrical contacts elements for making or breaking of an electrical circuit. Background
  • Lubrication of contact surfaces can for example be made by use of oil- or grease based lubricants.
  • oil- or grease based lubricants have many drawbacks: They are difficult to apply in a layer of suitable thickness; they are often volatile and may react with other compounds in the contact area; they are sticky and may therefore absorb
  • Solid lubricants such as graphite, molybdenum disulphide or suitable types of plastic may alternatively be used.
  • many types of solid lubricants are poor electrical conductors, and are often worn off when contact surfaces slide against each other.
  • a contact having a surface layer formed of a composition including a noble metal component and graphite is disclosed.
  • the surface layer is manufactured by sintering a mixture of noble metal particles and graphite particles, so that graphite particles are formed within solid noble metals, and by rolling the sintered body into a strip in a number of rolling steps with intermediate heat-treatments.
  • the surface layer disclosed in US 5,316,507 suffers from a low resistance against mechanical wear.
  • a contact element wherein at least one contact surface on a metallic body of the contact element is at least partially coated with a friction reducing layer of a metal salt, such as e.g. silver iodide, is disclosed in US 6,565,983 as well as in "Silver Iodide as a Solid Lubricant or Power Contacts", S. Arnell & G. Andersson, Proc 47 th IEEE Holm Conf. on Electrical Contacts, Montreal, 2001.
  • the contact element disclosed in US 6,565,983 exhibits a low friction at the contact surface, a high corrosion resistance and an improved durability compared to previously known contact elements. However, the initial contact resistance of such contact element is high, and the contact element must generally be operated several times before an acceptable contact resistance level is reached.
  • a problem to which the present invention relates is how to provide a highly durable contact element which exhibits an acceptable initial contact resistance.
  • One embodiment provides an electrical contact element for providing electrical contact in an electrical circuit, wherein at least part of at least one contact surface of the contact element is formed from a Me-16/17 compound composite material comprising a matrix of a metallically conducting material and particles formed from a Me-16/17 compound.
  • a Me-16/17 compound is a compound formed by at least one metal and an element from one of group 16 or 17 of the periodic table, i.e. a metal halogenide, metal chalcogenide or a metal oxide.
  • a contact surface of high durability and low, stable contact resistance can be achieved.
  • the initial contact resistance of the composite material is approximately the same as the contact resistance when parts of the composite material have been worn off, since the surface which is exposed when parts of the composite material have been worn off will have a similar composition to that of the initial surface.
  • the matrix of the composite material ensures good conductivity, so that a composite material thickness which provides desirable durability properties may be used.
  • a contact element of sufficient durability may be achieved also for applications wherein the number of contact operations is very large.
  • the composite material could be applied as a surface layer on a contact body of the contact element, or could form the bulk of the contact element.
  • the thickness of a surface layer could for example be within the range of 0.1-10 000 ⁇ . In for example sliding contacts in switches and breakers, the thickness of the surface layer will often be within the range of 5-200 ⁇ . In applications where the number of contact operations will be very large, such as in some tap changers, a larger thickness, for example around 2000 ⁇ , is often beneficial.
  • the Me- 16/17 compound content of the composite material is below 25 volume percent. In many applications, it may be advantageous to use a Me- 16/17 compound content which is below 10 volume percent, e.g. within the range of 0.5 - 5 volume percent.
  • the majority of the Me- 16/17 compound particles in the composite material have a diameter in the range of 5 nm - 10 ⁇ . In many applications, the majority of the Me- 16/17 compound particles in the composite material have a diameter in the range of 0.1 - 1 ⁇ .
  • the matrix of the composite material can for example be formed from silver, tin, copper, aluminium, gold or any other suitable metallic material.
  • the matrix could be formed from a metallically conducting ceramic material.
  • At least a majority of the particles of the composite material are formed from a metal halogenide, such as silver iodide.
  • the particles of the composite material may all be of the same Me- 16/17 compound, or particles of different Me- 16/17 compounds may be provided.
  • the concentration of at least one type of Me- 16/17 compound particles show a gradient along a direction parallel to a contact surface of the contact element.
  • the properties of the contact surface such as resistivity or friction coefficient, can vary along the surface of the contact element.
  • a contact including one or more contact elements according to the invention may also be provided.
  • the contact element of the invention may for example be used in a tap changer, a breaker, a switch, a plug-in contact, in a contact in an electric motor, etc.
  • Fig. la is a schematic illustration of an example of an electrical contact of plug-in type.
  • Fig. lb is a schematic illustration of an example of an electrical contact of spiral spring type.
  • Fig. Ic is a schematic illustration of an example of an electrical contact forming part of a tap changer.
  • Fig. 2a schematically illustrates a contact element having a contact surface layer made from a composite material of Me- 16/17 compound particles in a matrix of a metallically conducting material.
  • Fig. 2b schematically illustrates a contact element made from a composite material of
  • Me- 16/17 compound particles in a matrix of a metallically conducting material in a matrix of a metallically conducting material.
  • Fig. 3 schematically illustrates an example of a tap changer having a contact surface made from a composite material of Me-16/17 compound particles in a matrix of a metallically conducting material.
  • Fig. 4 schematically illustrates an example of a rotating electrical contact.
  • Fig. 5 schematically illustrates a contact element comprising particles of two
  • An electrical contact 100 can e.g. be of plug-in type, a sliding contact or a stationary contact; it can be designed for low voltage, medium voltage or high voltage; it can be designed for use in different electrical applications, such as electrical devices, control systems, power transmission- or distribution systems, etc.
  • Figs, la-lc show a non-limiting selection of different electrical contact designs. Only a very limited number of the possible contact designs can be shown here, and three different designs have been selected for illustration purposes only.
  • Fig. la shows an electrical contact 100 of traditional plug-in type, which comprises a first contact element 105a and a second contact element 105b.
  • each pin 110 has a contact surface 117a which is arranged to be in contact with a contact surface 117b of the contact rail 115.
  • the width of the opening of the jaw formed by the two pins 110 is such that when the contact rail 115 is entered into the j aw of the first contact element 110a, the pins 110 will apply a suitable force on the contact rail 115 so that electrical contact between the contact surfaces 117a and 117b is established.
  • Fig. lb schematically illustrates an example of an electrical contact 100 of intermediate spiral spring type design.
  • the electrical contact 100 in Fig. lb is a spiral contact where a first contact element 105c is in the form of a resilient annular body, e.g. a ring of a spiralized wire, a second contact element 105d is in the form of an inner sleeve or a pin, and a third contact element 105e is in the form of an outer sleeve or tube.
  • a first contact element 105c is in the form of a resilient annular body, e.g. a ring of a spiralized wire
  • a second contact element 105d is in the form of an inner sleeve or a pin
  • a third contact element 105e is in the form of an outer sleeve or tube.
  • the first element 105 c is, in contacted state, compressed such that a first contact surface 117c of the first contact element will be clamped against a contact surface 117d of the second contact element 105d, and so that a second contact surface 117f of the first contact element 105c will be clamped against a contact surface 117e of the third contact element 105e, thereby making electrical contact between contact elements 105c, 105d and 105f.
  • Fig. lc illustrates an electrical contact 100 in the form of a tap changer 130 for a transformer.
  • Electrical contact 100 of the tap changer 130 comprises a first contact element 105g which is arranged as a moveable part of the tap changer 130, as well as four contact elements 105h arranged at different locations on a transformer winding 135.
  • the first contact element 105g is slideably arranged so that the first contact element 105g can be moved between the four contact elements 105h. In this way, a variable number of turns 140 can be included in the electrical loop of the transformer winding, depending on which of the four contact elements 105h is in electrical contact with first contact element 105g.
  • the first contact element 105g has a contact surface 117g, arranged to make contact with one of the four contact surfaces 117h of the four contact elements 105h, respectively.
  • the reference numeral 105 when referring to contact elements in general, the reference numeral 105 will be used; when referring to contact surfaces in general, the reference numeral 117 will be used, and so forth.
  • the electrical contacts 100 shown in Figs, la-lc all have at least two contact surfaces 117, which are arranged so that a current transmission path can be made through at least two contact surfaces 1 17, and so that a made current transmission path may be broken.
  • a first contact surface 117 of a contact 100 is provided on a first contact element 105 of the electrical contact 100, and a second contact surface 117 is provided on a second contact element 105 of the contact, where the first and second contact elements 105 are mechanically movable in relation to each other to facilitate the making and breaking of electrical contact between the contact elements 105.
  • electrical contacts 100 which only have one contact element 105, and which are arranged to co-operate with another electrical contact 100 having at least one contact element 105— a simple example of such an electrical contact 100 is the standard wall socket used in homes.
  • low contact resistance, good thermal properties and high durability are desirable properties of a contact surface 117.
  • a metal salt layer is provided on at least part of a contact surface of an electrical contact to provide lubrication of the contact surface, fulfils these expectations to a high degree.
  • the initial contact resistance of such contact surface is very high.
  • a low initial contact resistance can be achieved by providing, at at least part of at least one contact surface 117 of a contact element 105, a composite material comprising particles of a Me- 16/17 compound in a matrix of metallically conducting material.
  • Me- 16/17 compound is herein used to refer to compounds including at least one metal and an element from group 16 or 17 of the periodic table, the Me- 16/17 compounds thus including metal halogenides, metal chalcogenides and metal oxides.
  • the term Me- 16/17 compounds thus includes metal salts, as well as other metal compounds.
  • Suitable materials for the Me-16/17 compound particles are for example the silver halogenides, including silver iodide (Agl), silver chloride (AgCl) and silver bromide (AgBr), as well as the silver chalcogenides, including silver sulphide (Ag 2 S), silver selenide (Ag 2 Se) and silver telluride (Ag 2 Te).
  • silver halogenides, chalcogenides or oxides wherein the metal component is another metal than silver could also be used, such as Cu-, Sn-, A1-, Au-, W-, V-, Ta- or Nb- halogenides/chalcogenides/oxides (e.g.
  • suitable metal oxides are: Magneli-phases (T1 4 O 7 , T1 5 O 9 and Ti 6 On), ITO - Indium Tin Oxide (ln 2 0 3 + Sn0 2 ), and Zr0 2 .
  • Me-16/17 compounds which are rarely found in nature could also be used, such as Ag 2 I and Agl 2 .
  • the metallically conducting matrix 215 of the composite material could for example be formed from a metal forming a metal component of the Me- 16/ 17 compound, or from a different material.
  • Suitable materials for the metallically conducting matrix 215 are materials of low resistivity, preferably of resistivity of 50 ⁇ or less. Materials of suitably low resistivity include metals such as Ag, Cu, Sn, Al, Au, as well as metallically conducting ceramic materials such as oxides, carbides, nitrides, carbo-nitrides and MAX phases.
  • FIG. 2a An example of a contact element 105 wherein such a composite material is provided at a contact surface 117 is schematically illustrated in Fig. 2a.
  • a surface layer 200 of thickness d is provided on a contact body 205, which can e.g. be made from a metallically conducting material.
  • the surface layer 200 comprises a plurality of Me-16/17 compound particles 210 dispersed in a matrix 215 of a metallically conducting material.
  • the metallically conducting material of the matrix 215 could be the same as, or different to, a metallically conducting material of the contact body 205.
  • FIG. 2b Another example of a contact element 105 wherein such a composite material is provided at a contact surface 117 is schematically illustrated in Fig. 2b.
  • the contact element 105 of Fig. 2b no separate body 205 is provided, but the body of the contact element is made from the composite surface layer 200.
  • the initial contact resistance will be approximately the same as the contact resistance after a number of operations, since the composition of the initial surface will be similar to the composition of the surface when the composite material has been partly worn down. Furthermore, the thickness d of the surface layer 200 which can be allowed without the resistance of the surface layer 200 taking an
  • the metallically conducting matrix 215 will provide a current path, so that no or very little current will have to go through the Me-16/17 compound particles 210.
  • the resistance of an electrical contact 100 having a surface layer 200 of a Me-16/17 compound composite can in many applications be considered to be unaffected by the wearing down of the surface layer 200 (until the surface layer 200 has been completely worn away), since the majority of the resistance of the contact 100 originates from other parts of the contact 100.
  • the Me- 16/17 compound particles 210 of the Me- 16/17 compound composite provides lubrication of the contact surface, so that the friction coefficient of the surface layer 200 takes a low value compared to the friction coefficient of the material of the matrix 215.
  • the friction coefficient of the Me-16/17 compound composite is typically similar to, or slightly higher than, the friction coefficient of a pure Me-16/17 compound film. As the surface layer 200 is worn, the friction coefficient will stay approximately constant until the surface layer 200 has been completely worn away, since if some of the particles 210 that used to be part of the contact surface 117 have been worn off, other particles 210, which were previously located in the interior of the surface layer 200, will appear at the contact surface 117 and provide similar lubrication.
  • the distribution of the particles 210 in the matrix 215 should be fairly uniform throughout the surface layer 200 in the direction
  • the particle distribution should be fairly uniform also along the directions parallel to the contact surface 117.
  • the ratio of the particle volume to the matrix volume could advantageously lie within the range of 5- 10 "5 to 0.33, so that the particles 210 will occupy somewhere in the range of 0.1 - 25 % of the volume of the surface layer 200.
  • the conductivity of the Me-16/17 compound composite will not be unacceptably reduced as compared to the conductivity of the matrix material, while the lubrication properties will be significantly enhanced.
  • the positive effect of the particles on the friction coefficient of the surface is generally such that the friction coefficient initially decreases rapidly with increasing particle concentration, while levelling out asymptotically as the particle level increases above a certain level. In many applications, a particle concentration within the range of 0.1-10 volume percent will be sufficient, thus keeping the conductivity of Me- 16/17 compound composite at a high level.
  • the average diameter of the particles 210 could advantageously be in the order of 0.01 - 10 ⁇ , and oftentimes, an average diameter of less than 1 ⁇ will be advantageous.
  • the adhesion force will be stronger with smaller particles, and material properties will be more homogeneous.
  • the average diameter of the particles 210 should advantageously be less than around 5 % of the thickness d of the surface layer 200, in order to maximize the conductivity of the surface layer 200.
  • an average particle size in excess of 10 ⁇ could be beneficial for a cost efficiency point of view.
  • the thickness of the surface layer 200 of a Me- 16/17 compound composite influences the durability, as well as the resistance, of the surface layer 200.
  • the thickness d of the surface layer 200 can thus be adapted to the requirements of durability and conductance of the contact surface 117.
  • the thickness of the surface layer will exceed 20 ⁇ , inter alia to avoid diffusion of material from the contact body 205 into the surface layer 200, although thicknesses as small as 5 ⁇ may be contemplated in certain embodiments where few sliding operations and/or low contact force is expected.
  • the thickness of the surface layer will be a thin film, the thickness of which will lie within the range of 20 to 100 or 200 ⁇ .
  • a thickness d within this range provides a surface which can withstand a large number of operations and/or a high contact force.
  • the thickness d of the Me-16/17 compound composite surface layer 200 could be considerably larger, e.g. 2000 ⁇ or more.
  • the surface layer 200 will exhibit properties which are more bulk-like than thin-film-like.
  • the majority of the contact element 200 is made from the Me- 16/17 compound composite (cf. for example the contact element shown in Fig. 2b).
  • the thickness and shape of the body 205 of a contact element 105 could advantageously be adjusted to the thickness of the surface layer 200 and the requirements of a particular electrical contact 100.
  • the body 205 could, in one implementation, be dispensed with, as illustrated in Fig. 2b.
  • the thickness of the body 205 could be thin compared to the thickness d of the surface layer 200, for example if the body 205 is merely used as a substrate onto which the Me-16/17 compound composite may be deposited.
  • a surface layer 200 of a Me-16/17 compound composite can for example be applied onto a body 205 by means of physical vapour deposition (PVD), where the metallically conducting matrix material and the Me-16/17 compound are for example sputtered or evaporated onto a body 205 to form a suitable Me-16/17 compound composition.
  • PVD physical vapour deposition
  • Reactive sputtering using an iodine-containing gas, such as CH 2 I 2 can for example be employed to form Agl.
  • the surface layer 200 of a Me-16/17 compound composite can alternatively be deposited onto a body 205 by means of thermal spraying. For surface layers 200 of larger thicknesses, thermal spraying typically provides a more durable material.
  • a contact element 105 having a Me-16/17 compound composite contact surface 117 can alternatively be achieved by sintering of a mixture of a powder of the metallically conducting matrix material and a powder of the Me-16/17 compound, in order to make thicker coatings or bulk contact elements 105 of composite material.
  • Me-16/17 compound composite contact surface 117 may be achieved using Chemical Vapour Deposition (CVD), Sol-Gel methods and
  • Fig. 3 illustrates an embodiment of a tap changer 130 having six electrical contacts in the form of different tap selector switches 300i, 300vi, as well as an electrical contact in the form of a diverter switch 310.
  • Two connection points 313i and 313ii are also provided for connecting the winding 135 to an electrical circuit/network.
  • Each of the tap selector switches 300 represent an electrical contact 100 having two switching elements 105k and 105m.
  • the diverter switch 310 has a first contact element
  • the first contact element 105n is pivotally movable around a pivot point 320, so as to allow for making and breaking of electrical contact with the contact elements 105p.
  • a particular one of the tap selector switches 300 is closed, while the others are open, and the diverter switch 310 is positioned so that the closed selector switch 300 is in electrical contact with the connection points 313i and 313ii.
  • Each of the contact elements 105k, 105m, 105n and 105p of the tap changer 130 has a contact surface 117, which may or may not have contact surface formed from a Me- 16/17 compound composite.
  • the first contact element 105n of the diverter switch 300 is shown to have a contact surface 117 having a surface layer 200 comprising Me-16/17 compound particles 210 in a matrix 215 of a metallically conducting material (see the partial enlargement 325).
  • the Me-16/17 compound composite is deposited on a body 205 in the form of a thin substrate.
  • an embodiment of an electrical contact 100 having a set of at least one rotating arm(s) 400 having contact elements 105q and a set of at least one fixed contact element(s) 105r, where the rotating arms 400 are rotatably mounted on an axis 405, so that, by rotating the rotating arms 400 around the axis 405, contact between the contact elements 105q and 105r will be made or broken.
  • the rotating contact elements 105q of the rotating arms 400 of Fig. 4 are of bulk composite material (indicated as shaded areas), and are in the shape of contact buttons. Contact elements 105q of bulk composite will ensure lubrication of the contact surfaces 117 during a large number of contact operations.
  • the bulk composite contact elements 105q could in another implementation be of other shapes, such as rivets or discs.
  • the bulk composite material contact elements 105q could be made with or without a body 205 - in the example of Fig. 4, no body 205 is present.
  • the contact surfaces of the fixed contact elements 105r could have a composite contact surface 117, or, alternatively, lubrication of the contact surface 117 could be supplied by the rotating contact elements 105q only.
  • One or two of the contact elements 105 by means of which electrical contact between can be made or broken, could have a contact surface 117 which is formed of the Me- 16/ 17 compound composite material. If the Me- 16/17 compound composite is applied on only one of the contact elements 105, lubrication will still be achieved from the presence of the Me- 16/17 compound particles 200 on the contact surface 117 of the other contact element 105.
  • the Me- 16/17 compound composite could be arranged to cover parts of, or the entire, contact surface 117 of a surface element 105.
  • a contact surface 117 which is partly covered by a Me- 16/17 compound composite could for example be useful if a part of the surface is likely to be exposed to arcing, since the particles 210, depending on the composition of the Me- 16/17 compound, may not be thermally stable at the temperatures caused locally by the arcing.
  • the parts of contact surface 117 where arcing is not likely to occur could advantageously be formed of the Me- 16/17 compound composite, while no Me-16/17 compound composite is provided at the arcing- prone parts.
  • the concentration of Me-16/17 compound particles 210 and/or the composition of the Me-16/17 compound particles 210 varies in the composite material along a direction parallel to the contact surface 117.
  • a resistivity and/or friction coefficient gradient could be formed over the contact surface 117 by varying the composition and/or concentration of the Me-16/17 compound particles.
  • a composite material having particles 210 of a mixture of different Me-16/17 compounds, or wherein particles of other composites than Me-16/17 compounds are used locally in the composite material, could in some applications be advantageous.
  • the arcing exposed part(s) of the surface 117 could include particles of lower conductivity than the Me-16/17 compound particles at the other parts of the surface 117.
  • the lower conductivity will ensure a lower current density through this part of the contact surface 117, and thus, the arcing effects will be mitigated.
  • particles of lower conductivity include oxides, which generally also have the advantage of being thermally more stable than the metal halogenides or chalcogenides at the temperatures caused locally by the arcing.
  • Suitable conducting oxides are: Magneli-phases (T1 4 O 7 , T1 5 O 9 and Ti 6 On), ITO - Indium Tin Oxide (ln 2 0 3 + Sn0 2 ), ⁇ 9 ⁇ 26 and Zr0 2 .
  • Fig. 5 is shown an example of a contact element 105 having a particle gradient along a direction x parallel to the contact surface 117.
  • the contact element 105 of Fig. 5 comprises two different particle types 210a and 210b, where the particles 210b are concentrated to one end of the contact element 105 in the x direction, this end for example being the last part of the contact element 105 to separate from the counterpart contact element upon opening of the contact in a current commutating application (e.g. in a tap changer or breaker), thus being more exposed to arcing than the rest of the contact element 105.
  • Surface layers having a concentration and/or composition gradient can for example be made by means of sputtering.
  • the inventive contact surface 117 formed from a Me-16/17 compound composite could be useful in electrical contacts of all sorts of design, such as for example on the contact surfaces 117 of the contact elements 105g-h shown in Figs, la, lb or lc, or in any other electrical contacts 100.
  • contact surfaces 117 formed from a Me-16/17 compound composite could be used in any contact application, such as for example in disconnectors, tap changers, contacts in electrical motors, breakers (for example HVDC breakers and high voltage AC breakers, as well as in breakers of more moderate voltages), switches, plug-in systems, etc.
  • Me-16/17 compound composite contact surface 117 is, as mentioned above, particularly advantageous in electrical contacts 100 for which a large number of contact operations is expected during the contact lifetime. Furthermore, the contact surface wear caused by the undesirable phenomenon of fretting, which sometimes occurs in contacts which are exposed to mechanical vibrations, cyclic thermal loads or high contact pressure etc., can be mitigated by use of a contact surface of a Me-16/17 compound composite.

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Abstract

La présente invention concerne un élément de contact électrique conçu pour fournir un contact électrique dans un circuit électrique, l'élément de contact comprenant un composé Me-16/17 servant de lubrifiant d'au moins une partie d'au moins une surface de contact de l'élément de contact, un composé Me-16/17 étant un composé formé par au moins un métal et un élément du groupe 16 ou 17 du tableau périodique. Au moins une partie d'au moins une surface de contact est formée à partir d'un matériau composite à base de composé Me-16/17 qui comprend une matrice d'un matériau métalliquement conducteur et des particules formées à partir d'un composé Me-16/17. En utilisant un matériau composite à base de composé Me-16/17 en tant que matériau de surface, une surface de contact de haute durabilité et de résistance faible et stable au contact peut être obtenue. La matrice de matériau composite garantit une bonne conductivité, de sorte qu'une épaisseur de matériau composite qui garantit des propriétés de durabilité souhaitables puisse être fournie, tout en maintenant la résistance au contact dans des limites acceptables.
PCT/EP2011/069790 2010-12-06 2011-11-10 Élément de contact électrique et contact électrique Ceased WO2012076281A1 (fr)

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CN103247450A (zh) * 2013-04-22 2013-08-14 浙江天银合金技术有限公司 一种电触头
CN104078249A (zh) * 2014-05-16 2014-10-01 浙江天银合金技术有限公司 一种银铜钨电触头及其加工工艺

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S. ARNELL, G. ANDERSSON: "Silver Iodide as a Solid Lubricant for Power Contacts", PROC 47 TH IEEE HOLM CONF. ON ELECTRICAL CONTACTS, MONTREAL, 2001

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103247450A (zh) * 2013-04-22 2013-08-14 浙江天银合金技术有限公司 一种电触头
CN104078249A (zh) * 2014-05-16 2014-10-01 浙江天银合金技术有限公司 一种银铜钨电触头及其加工工艺

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