WO2011162107A1 - 電気接点材 - Google Patents

電気接点材 Download PDF

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Publication number
WO2011162107A1
WO2011162107A1 PCT/JP2011/063200 JP2011063200W WO2011162107A1 WO 2011162107 A1 WO2011162107 A1 WO 2011162107A1 JP 2011063200 W JP2011063200 W JP 2011063200W WO 2011162107 A1 WO2011162107 A1 WO 2011162107A1
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WIPO (PCT)
Prior art keywords
electrical contact
contact material
less
tungsten carbide
mass
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PCT/JP2011/063200
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English (en)
French (fr)
Japanese (ja)
Inventor
隆志 畠山
上西　昇
胡間　紀人
恭彦 鈴木
Original Assignee
株式会社アライドマテリアル
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Application filed by 株式会社アライドマテリアル filed Critical 株式会社アライドマテリアル
Priority to JP2011542622A priority Critical patent/JP4898978B2/ja
Priority to EP11797993.0A priority patent/EP2586883B1/en
Priority to CN201180030832.2A priority patent/CN102947475B/zh
Publication of WO2011162107A1 publication Critical patent/WO2011162107A1/ja

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C5/00—Alloys based on noble metals
    • C22C5/06—Alloys based on silver
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C22C29/08—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
    • C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
    • C22C32/0052—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H01H1/021—Composite material
    • H01H1/023—Composite material having a noble metal as the basic material
    • H01H1/0233—Composite material having a noble metal as the basic material and containing carbides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy

Definitions

  • the present invention relates generally to electrical contact materials, and more specifically to electrical contact materials made of silver-tungsten carbide-graphite (Ag-WC-Gr) -based materials and used in circuit breakers (breakers) and the like. It is.
  • Ag-WC-Gr silver-tungsten carbide-graphite
  • An electrical contact material made of a silver-tungsten carbide-based material containing a certain amount or more of tungsten carbide as a heat-resistant non-oxide has been conventionally used for a breaker having a rated current value of 200 A or more.
  • graphite is added in order to prevent oxidation of tungsten carbide under high heat at the time of interruption to suppress temperature rise (temperature performance) and to improve welding resistance.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 58-11753 discloses 5-70% by weight of carbides of group IVa, Va, and VIa group metals such as tungsten carbide and 1-11 of graphite. 5% to 60% by weight of iron group metal, 0.1 to 30% by weight of nitride of IVa, Va, VIa, and VIIa metal, with the balance being silver, and carbide and nitride in the iron group metal And electrical contact materials dispersed in silver are disclosed.
  • Patent Document 2 discloses 5-70% by weight of carbides of group IVa, Va, and VIa group metals such as tungsten carbide and 1-11 of graphite. % By weight, 5-60% by weight of iron group metal, 0.1-5% by weight of metal of group IVa, Va, VIa, VIIa, the balance being made of silver, carbide and group IVa, Va, VIa, VIIa metal Is disclosed as a solid solution or dispersion in iron group metals and silver.
  • the above-mentioned electrical contact material is manufactured not by a melting method but by a powder metallurgy method because of poor wettability between a heat-resistant non-oxide such as tungsten carbide and silver.
  • a powder metallurgy method a starting material powder is compression-molded to form a compact, and this compact is sintered. In the sintered body thus obtained, there are gaps (pores) between the bonded powder particles.
  • the electrical contact material obtained has a low relative density and is not densified, so the electrical conductivity is low.
  • produces at a contact at the time of interruption
  • the relative density is improved by re-pressurizing the sintered body.
  • the relative density obtained with this method is less than 95%.
  • the electrical conductivity of an electrical contact material will become low. Thereby, the welding resistance, wear resistance, and temperature performance of the electrical contact material become insufficient.
  • an object of the present invention is to provide an electrical contact material excellent in welding resistance, wear resistance, and temperature performance.
  • the electrical contact material according to the present invention contains tungsten carbide more than 30 mass% and 55 mass% or less, graphite 2 mass% or more and 5 mass% or less, the remainder contains silver and inevitable impurities, and the relative density is 98. 0% or more, oxygen content is 450 ppm or less, conductivity is 45% IACS or more, and bending strength is 350 MPa or more.
  • the average particle diameter of tungsten carbide is 0.5 ⁇ m or more and 5 ⁇ m or less.
  • the average particle diameter of graphite is 1 ⁇ m or more and 50 ⁇ m or less.
  • the relative density is 98.0% or more, the oxygen content is 450 ppm or less, the conductivity is 45% IACS or more, and the bending strength is 350 MPa or more. It is possible to provide an excellent electrical contact material.
  • the breaker 10 can contact the fixed contact member 30 and the fixed contact member 30, or can be separated from the fixed contact member 30.
  • the movable-side contact member 20 is disposed so as to be movable repeatedly.
  • the stationary contact member 30 is composed of a joined body of an electrical contact material 31 and a base metal 32.
  • the movable contact member 20 is composed of a joined body of an electrical contact material 21 and a base metal 22.
  • the electrical contact material 31 according to the embodiment of the present invention is used for a part of the stationary contact member 30 of the breaker 10.
  • the electrical contact material 31 shown in FIGS. 1 and 2 is an example of the “electrical contact material” according to the present invention.
  • the electrical contact material 31 and the base metal 32 are joined to each other via the brazing material 4 with the upper surface of the joint portion 32 a formed integrally on the base metal 32 side as the joint surface.
  • the electrical contact material 21 and the base metal 22 are joined to each other via the brazing material 4 with the upper surface of the joint portion formed integrally on the base metal 22 side as the joint surface.
  • the movable contact member 20 and the fixed contact member 30 are configured in this way, the electric contact of the movable contact member 20 with respect to the electric contact material 31 of the fixed contact member 30 as shown in FIG.
  • a built-in contact trip device (not shown) is activated, and FIG.
  • the electric contact member 21 of the movable contact member 20 is instantaneously separated from the electric contact member 31 of the fixed contact member 30 in the direction of the arrow Q, and the current is cut off. .
  • the end side of the base metal 32 on which the electrical contact material 31 is not provided is connected to the primary side (power supply side) terminal of the breaker 10 among the fixed side contact members 30.
  • the end portion of the base metal 22 on which the electrical contact material 21 is not provided is connected to the secondary side (load side) terminal of the breaker 10.
  • the movable-side electrical contact material 21 incorporated in the breaker 10 is made of a silver-tungsten carbide (Ag-WC) -based material
  • the fixed-side electrical contact material 31 is the electrical contact material of the present invention.
  • tungsten carbide (WC) is more than 30% by mass and 55% by mass or less
  • graphite (Gr) is 2% by mass to 5% by mass.
  • the balance contains silver (Ag) and inevitable impurities, the relative density is 98.0% or more, the oxygen content is 450 ppm or less, the conductivity is 45% IACS or more, and the bending strength is 350 MPa or more.
  • tungsten carbide as a heat-resistant non-oxide which is a refractory is contained in an amount of more than 30% by mass and 55% by mass or less, so that arc resistance, welding resistance, wear resistance are reduced.
  • the advantage of improving the property over a certain level is obtained.
  • the content of tungsten carbide is 30% by mass or less, not only the above advantages cannot be obtained, but the bending strength may be less than 350 MPa.
  • the content of tungsten carbide exceeds 55% by mass, the electrical conductivity is lowered, so that the material does not function as a contact for a breaker, an electromagnetic switch or the like. Specifically, if the content of tungsten carbide exceeds 55% by mass, the conductivity may be less than 45% IACS.
  • the content of tungsten carbide is preferably 40% by mass or more and 50% by mass or less.
  • graphite is contained in an amount of 2% by mass or more and 5% by mass or less, thereby preventing oxidation of tungsten carbide as a heat-resistant non-oxide under high heat at the time of interruption, and welding resistance.
  • the advantage of improving can be obtained. If the content of graphite is less than 2% by mass, the above advantages cannot be obtained. If the graphite content exceeds 5% by mass, the material cannot be molded.
  • the graphite content is preferably 2% by mass or more and 4% by mass or less.
  • the balance contains silver and inevitable impurities, but in order to ensure electrical conductivity of the contact, it is preferable that silver is contained in an amount of 40% by mass or more and 68% by mass or less.
  • the silver content is less than 40% by mass, the electrical conductivity is lowered, and the material is not suitable for electrical contact materials for breakers, electromagnetic switches, and the like.
  • the silver content exceeds 68% by mass, the content of tungsten carbide as a heat-resistant non-oxide, which is a refractory, becomes small, so that arc resistance, welding resistance, and wear resistance are improved to a certain extent. I can't.
  • the silver content is preferably 45% by mass or more and 60% by mass or less.
  • the balance is iron (Fe), nickel (Ni), cobalt (Co), chromium (Cr), molybdenum (Mo), copper (Cu), tantalum (Ta), vanadium (V). , Magnesium (Mg), zinc (Zn), tin (Sn), and at least one element or carbide selected from the group consisting of these carbides and the like in a range of 0% by mass to 3% by mass It may be. When the content of the element or carbide exceeds 3% by mass, the conductivity may be less than 45% IACS.
  • the content of the element or carbide is preferably 1% by mass or less.
  • the relative density when the relative density is 98.0% or more, excellent welding resistance and wear resistance can be obtained. If the relative density is less than 98.0%, the electric conductivity may be less than 45% IACS, so that the electrical contact material is inferior in welding resistance and wear resistance.
  • the relative density is preferably 99.0% or more and 100% or less.
  • the oxygen content is 450 ppm or less, excellent wear resistance can be obtained. If the oxygen content exceeds 450 ppm, the oxygen remaining in the electrical contact material is suddenly released at the time of interruption, and there is a risk that contact consumption will increase. Specifically, when the oxygen content exceeds 450 ppm, oxygen present in the material becomes a gas due to high heat of several thousand degrees generated during the short circuit test, and thus a part of the base material of the electrical contact material is scattered. This increases the rate at which the electrical contact material is consumed.
  • the oxygen content is preferably 350 ppm or less. In the overload test, since the contact load is small, the rate at which the electrical contact material is consumed is hardly affected by the oxygen content. However, the oxygen content is preferably 120 ppm or more for reasons of difficulty in production. Here, “difficulty in production” means that no matter how small the oxygen content is, 120 ppm is a production limit.
  • the electrical conductivity is 45% IACS or more, excellent welding resistance, wear resistance, and temperature performance can be obtained.
  • the electrical conductivity is less than 45% IACS, the welding resistance, wear resistance, and temperature performance deteriorate.
  • the conductivity is preferably 65% IACS or less for reasons of difficulty in manufacturing.
  • “manufacturing difficulty” means that 65% IACS is a manufacturing limit no matter how much the conductivity is increased.
  • the bending strength of the electrical contact material of the present invention is 350 MPa or more in order to withstand the impact.
  • the electrical contact material breaks due to insufficient mechanical strength of the material in a short-circuit test with a large contact load.
  • the bending strength is preferably 380 MPa or more.
  • the bending strength is preferably 580 MPa or less because of difficulty in production.
  • “difficulty in production” means that no matter how much the bending strength is increased, 580 MPa is a production limit.
  • the average particle size of tungsten carbide is preferably 0.5 ⁇ m or more and 5 ⁇ m or less. If the average particle size of tungsten carbide is less than 0.5 ⁇ m, the material cannot be molded. If the average particle size of tungsten carbide exceeds 5 ⁇ m, the strength varies depending on the location of the electrical contact material. When low strength parts are connected, the electrical contact material is selectively consumed after the short circuit test. As a result, arc resistance, welding resistance, and wear resistance may be deteriorated.
  • the average particle diameter of graphite is preferably 1 ⁇ m or more and 50 ⁇ m or less. If the average particle size of graphite is less than 1 ⁇ m, the material cannot be molded. Further, when the average particle diameter of graphite exceeds 50 ⁇ m, the strength varies depending on the location of the electrical contact material. When low strength parts are connected, the electrical contact material is selectively consumed after the short circuit test. As a result, arc resistance, welding resistance, and wear resistance may be deteriorated.
  • the electrical contact material made of the silver-tungsten carbide-graphite (Ag-WC-Gr) material of the present invention is manufactured as follows.
  • the average particle size of the prepared silver (Ag) powder is 0.5 ⁇ m to 10 ⁇ m
  • the average particle size of the tungsten carbide (WC) powder is 0.5 ⁇ m to 5 ⁇ m
  • the average particle size of the graphite (Gr) powder is 1 ⁇ m or more. 50 ⁇ m or less.
  • the average particle diameter of silver (Ag) powder is 1 ⁇ m or more and 5 ⁇ m or less
  • the average particle diameter of tungsten carbide (WC) powder is 1 ⁇ m or more and 3 ⁇ m or less
  • the average particle diameter of graphite (Gr) powder is 3 ⁇ m or more and 10 ⁇ m or less.
  • the purity of each of silver (Ag) powder, tungsten carbide (WC) powder, and graphite (Gr) powder is preferably 99.5% or more. If the purity of each powder is less than 99.5%, impurities such as oxygen (O) and carbon (C) existing at the grain boundaries of the powder increase, and the electrical conductivity of the electrical contact material may be lowered.
  • silver powder, tungsten carbide powder and graphite powder are mixed in a vacuum of 80 Pa to 150 Pa, for example, for 30 minutes to 60 minutes, for example, in a dry ball mill according to a predetermined composition.
  • a vacuum 80 Pa to 150 Pa
  • fine raw material powder can be mixed uniformly and each particle can be disperse
  • mechanical strength such as the bending strength of an electrical contact material
  • the pressure of the mixed atmosphere exceeds 150 Pa, the degree of vacuum becomes insufficient, and there is a possibility that the particles of the raw material powder having a large specific gravity difference cannot be uniformly dispersed. If the mixing time is less than 30 minutes, the mixing becomes insufficient, and the particles of the raw material powder may not be uniformly dispersed. When the mixing time exceeds 60 minutes, productivity may be deteriorated.
  • a compression molded body is formed by applying a pressure of, for example, 250 MPa to 350 MPa to the mixed powder.
  • This step is performed so that an electrical contact material having a higher relative density can be obtained by a coining step and an extrusion step, which are subsequent steps.
  • the pressing pressure is less than 250 MPa, the amount of deformation in the coining process becomes large, so there is a possibility that it is not possible to press the relative density to 93% or more in a single coining process.
  • the press pressure exceeds 350 MPa, the relative density of the press body exceeds 85%, so that the gap in the press body becomes small. As a result, the internal reduction of the material becomes insufficient in the subsequent sintering step, and oxygen may remain.
  • the obtained compression molded body is sintered, for example, by holding it in a reducing gas atmosphere such as hydrogen gas at a temperature of 1000 ° C. or higher and 1100 ° C. or lower, for example, for 1 hour or more and 2 hours or less. .
  • a reducing gas atmosphere such as hydrogen gas
  • the amount of oxygen as an impurity adsorbed inside the electrical contact material can be reduced.
  • the sintering temperature is less than 1000 ° C., the sintering is not completed.
  • the sintering temperature exceeds 1100 ° C. a large amount of gas is generated and the material may foam. If the sintering time is less than 1 hour, the sintering is not completed. If the sintering time exceeds 2 hours, the productivity may deteriorate.
  • the obtained sintered body is coined under a pressure of, for example, 1000 MPa to 1200 MPa so that the relative density is, for example, 93% to 99%.
  • This step is performed in order to obtain an electric contact material having a higher relative density by an extrusion step which is a subsequent step.
  • this step is performed in order to reduce the amount of oxygen as an impurity that enters the material during preheating in the extrusion step. If the coining pressure is less than 1000 MPa, the relative density of the material may be about 90%. If the coining pressure exceeds 1200 MPa, the durability of the mold used may be deteriorated.
  • the relative density after the coining process is less than 93%, the amount of oxygen as an impurity entering the material during preheating in the extrusion process may increase. If the relative density after the coining step exceeds 99%, even if the pressure is increased beyond this, the relative density is not improved by the spring back, and the productivity may be deteriorated.
  • the coined sintered body is, for example, 1 hour or more in a reducing gas atmosphere such as hydrogen gas or an inert gas atmosphere such as nitrogen gas at a temperature of 850 ° C. or more and 920 ° C. or less.
  • a reducing gas atmosphere such as hydrogen gas or an inert gas atmosphere such as nitrogen gas
  • an extrusion pressure 180 GPa or more and 250 GPa or less is applied to extrude into a predetermined shape.
  • the electrical contact material made of the silver-tungsten carbide-graphite (Ag-WC-Gr) material of the present invention is manufactured.
  • the manufacturing method combining conventional press working and sintering, it is difficult to increase the relative density.
  • the old powder grain boundary in the raw material powder in which many impurities such as oxygen and carbon are present is easily maintained even after sintering. For this reason, impurities such as oxygen and carbon remain concentrated at the grain boundaries of the sintered electrical contact material. This remaining impurity reduces the electrical conductivity and bending strength of the material.
  • the relative density can be increased, the old powder grain boundaries are extended, and the high purity silver particles are in contact with each other.
  • the influence of the old powder grain boundary in the raw material powder is extremely small.
  • a relative density of 98% or more can be obtained, and the amount of impurities remaining at the grain boundary can be reduced, so that the electrical conductivity and the bending strength of the electrical contact material are improved.
  • the preheating temperature is less than 850 ° C.
  • the deformation resistance of the extruded material is increased, so that extrusion may not be possible.
  • the preheating temperature exceeds 920 ° C.
  • the temperature during extrusion exceeds the melting point of silver, so that the surface of the extruded material may be foamed.
  • the preheating time is less than 1 hour, the inside of the material is not heated, so that the deformation resistance increases and there is a possibility that the material cannot be extruded. If the preheating time exceeds 2 hours, the material is heated sufficiently uniformly, so that the productivity may be deteriorated.
  • the extrusion pressure is less than 180 GPa, the relative density of the extruded material may be lowered. If the extrusion pressure exceeds 250 GPa, the extrusion die may be damaged.
  • the relative density is improved by repressurizing a sintered compact.
  • impurities such as oxygen and carbon remain concentrated at the grain boundaries of the sintered electrical contact material.
  • the remaining impurities reduce the conductivity and bending strength of the material.
  • pressurizing a sintered compact again, you must restrain the outer peripheral direction of a sintered compact without gap. For this reason, it is necessary to set the sintered bodies one by one in the mold and pressurize them. As a result, there is a problem that the production cost becomes high.
  • an extrusion method is employed. For this reason, an electrical contact material having a relative density of 98% or more can be produced by a method with high mass productivity. As a result, the production cost can be reduced.
  • the electrical contact material of the present invention high conductivity can be obtained in a material containing 10% by mass to 30% by mass of tungsten carbide as a refractory. Thereby, since heat generation at the time of interruption can be reduced, welding resistance, wear resistance, and temperature performance can be improved. Further, since the electric contact material of the present invention has a higher bending strength than the conventional electric contact material, it is possible to reduce contact breakdown in a short-circuit test with a large contact load.
  • the fixed-side electrical contact material 31 according to Examples 1 to 15 below was manufactured.
  • the fixed-side electrical contact material 31 according to the following comparative examples 1 to 4 was manufactured. An interruption test by an overload test and a short-circuit test was conducted using each of the breakers for a large current with a rated current value of 125 A configured by incorporating each of these electrical contact materials 31.
  • the movable-side electrical contact material 21 was made of a material containing 50% by mass of silver and the balance being tungsten carbide.
  • the average particle diameter of the graphite (Gr) powder, the content of graphite (Gr) in the prepared electrical contact material 31, tungsten carbide used to produce the electrical contact material 31 in the examples and comparative examples of the present invention The following table shows the average particle diameter of the (WC) powder, the content of tungsten carbide (WC) in the produced electrical contact material 31, the relative density, the oxygen content, the electrical conductivity, and the bending strength of the electrical contact material 31.
  • the consumption rate of the electrical contact material 31 after the overload test, the consumption rate of the electrical contact material 31 after the short circuit test, and the evaluation results for the temperature test are also shown in Table 1. Numerical values underlined indicate that they are outside the scope of the present invention.
  • an electrical contact material 31 of a silver-tungsten carbide-graphite (Ag-WC-Gr) -based material containing graphite (Gr) and tungsten carbide (WC) with the contents shown in Table 1 is as follows. It was made.
  • the graphite (Gr) powder and tungsten carbide (WC) powder having the average particle size shown in Table 1 and the silver (Ag) powder having an average particle size of 3 ⁇ m are set to have the Gr content and WC content shown in Table 1.
  • a pressure of 300 MPa to the obtained mixed powder with a press, a disk-shaped compression molded body having a thickness of 300 mm and an outer diameter of 80 mm was formed.
  • This compression-molded body was sintered by being held in hydrogen gas having a reducing gas atmosphere at a temperature of 1050 ° C. for 1.5 hours.
  • This sintered body was coined under a pressure of 1100 MPa so that the true density was 97% or more.
  • the coined sintered body is preheated by holding in a reducing gas atmosphere of hydrogen gas at a temperature of 900 ° C. for 1.5 hours, and then applied with an extrusion pressure of 220 GPa so that the cross section is 10 mm square. Extrusion processing was performed to obtain a rod-shaped body. The obtained rod-shaped body was cut into a thickness of 1 mm to produce an electrical contact material 31.
  • an electrical contact material 31 of a silver-tungsten carbide-graphite (Ag-WC-Gr) -based material containing graphite (Gr) and tungsten carbide (WC) with the contents shown in Table 1 is as follows. Produced.
  • the graphite (Gr) powder and tungsten carbide (WC) powder having the average particle size shown in Table 1 and the silver (Ag) powder having an average particle size of 3 ⁇ m are set to have the Gr content and WC content shown in Table 1.
  • a plate-like compression-molded body having a planar shape of 10 mm square and a thickness of 1 mm was formed by applying a pressure of 300 MPa to the obtained mixed powder with a press.
  • This compression-molded body was sintered by holding it in a vacuum at a temperature of 900 ° C. for 1 hour. This sintered body was coined under a pressure of 500 MPa so that the true density was 97% or more.
  • the electrical contact material 31 was obtained.
  • Comparative Example 2 the same average particle size as in Example 1 was obtained as shown in Table 1 according to the same steps as in Examples 1 to 15 except that the step of coining the sintered body was not performed.
  • Comparative Example 3 the same procedure as in Examples 1 to 15 above was followed, except that the compression molded body was sintered by holding it in nitrogen gas at a temperature of 950 ° C., which is a protective gas atmosphere, for 1 hour.
  • Table 1 a silver-graphite-tungsten carbide (Ag-Gr-WC) -based electrical contact material containing graphite (Gr) and tungsten carbide (WC) with the same average particle size and content as in Example 1 31 was produced.
  • Comparative Example 4 is the same as Example 1 as shown in Table 1 according to the same steps as in Examples 1 to 15 except that silver powder, graphite powder and tungsten carbide powder were mixed in the atmosphere.
  • An electrical contact material 31 of silver-graphite-tungsten carbide (Ag-Gr-WC) based material containing graphite (Gr) and tungsten carbide (WC) with an average particle size and content was produced.
  • the relative density [%] of the produced electrical contact material was calculated by dividing the weight of the electrical contact material by the volume of the electrical contact material (calculated value obtained by product of vertical dimension ⁇ horizontal dimension ⁇ thickness dimension). The density was calculated by dividing by the theoretical density of each material.
  • the measurement of the oxygen content [ppm] remaining in the produced electrical contact material was performed by an infrared absorption method using an oxygen analyzer (model BMGA520) manufactured by Horiba, Ltd.
  • the electrical conductivity [% IACS] was measured with a sigma tester (manufactured by FOERSTER INSTRUMENTS, product number: SIGMATEST D) using a sample of an electrical contact material having a cross-sectional shape of 10 mm square.
  • a sample for a bending test having a size of 5 mm ⁇ 2 mm ⁇ 30 mm was produced from the same material as the produced electrical contact material. Using this sample, the bending strength [MPa] was measured under the conditions of a distance between supporting points of 15 mm and a head speed of 1 mm / min.
  • a breaking current of 5000 A was set at a load voltage of 220V.
  • the test for forcibly turning on the switch and cutting off the current instantaneously was performed according to the following procedure. That is, in this short circuit test, one O duty and three CO duties were performed in this order as operation duties.
  • the consumption rate of the electrical contact material 31 after a short circuit test was computed by said (Formula 1).
  • Table 1 as the evaluation of the consumption rate, “ ⁇ ” is shown when the calculated consumption rate is 10% or less, “ ⁇ ” when it is 40% or less, and “x” when it exceeds 40%.
  • a breaking current of 5000 A was set at a load voltage of 265V.
  • the test for forcibly turning on the switch and cutting off the current instantaneously was performed according to the following procedure. That is, in this welding test, one O duty and five CO duties were performed in this order as operation duties. And the welding condition of the electrical contact material 31 during a welding test or after a welding test was evaluated.
  • the rated current was passed after the overload test and the interruption test, and the temperature of the breaker terminal when the temperature stabilized was measured.
  • Table 1 shows “ ⁇ ” when the temperature rise is less than 75K, “ ⁇ ” when it is 75K or more and less than 80K, and “X” when it is 80K or more.
  • the electrical contact material 31 of the present invention is applied to the stationary contact member 30 of the breaker 10 .
  • the present invention is not limited to this example, and the breaker is not limited thereto.
  • the electric contact material of the present invention may be used for any of the ten movable side contact members 20 or the fixed side contact member 30.
  • the electrical contact material of the present invention is preferably incorporated in the breaker 10 having a rated current value of about 100 A to 1600 A, and more preferably incorporated in the breaker 10 having a rated current value of 100 A or more and less than 800 A.
  • the electrical contact material 31 of the present invention is used for the breaker 10 as an example of a switch
  • the present invention is not limited to this example.
  • the electrical contact material of the present invention may be used for a switch (switch device) other than a breaker such as an electromagnetic switch.
  • the electrical contact material of the present invention is used by being incorporated in a breaker for high current having a rated current value of 100A to 1600A.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Composite Materials (AREA)
  • Contacts (AREA)
  • Powder Metallurgy (AREA)
PCT/JP2011/063200 2010-06-22 2011-06-09 電気接点材 WO2011162107A1 (ja)

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JP2011542622A JP4898978B2 (ja) 2010-06-22 2011-06-09 電気接点材
EP11797993.0A EP2586883B1 (en) 2010-06-22 2011-06-09 Electrical contact material
CN201180030832.2A CN102947475B (zh) 2010-06-22 2011-06-09 电触点材料

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JP2010141247 2010-06-22
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JP6302276B2 (ja) * 2014-02-12 2018-03-28 日本タングステン株式会社 電気接点材料、電気接点対および遮断器
CN111001801A (zh) * 2019-12-04 2020-04-14 福达合金材料股份有限公司 一种银碳化钨-钼复合电触头材料及其骨架粉体和制备方法

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JPS52147768A (en) * 1976-06-03 1977-12-08 Sumitomo Electric Industries Electric contact material
JPS5811753A (ja) 1981-07-15 1983-01-22 Sumitomo Electric Ind Ltd 電気接点材料
JPS5811754A (ja) 1981-07-15 1983-01-22 Sumitomo Electric Ind Ltd 電気接点材料
JPH07192565A (ja) * 1993-12-24 1995-07-28 Toshiba Corp 接点材料およびその製造方法

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US4810289A (en) * 1988-04-04 1989-03-07 Westinghouse Electric Corp. Hot isostatic pressing of high performance electrical components
US4954170A (en) * 1989-06-30 1990-09-04 Westinghouse Electric Corp. Methods of making high performance compacts and products
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CN1658346A (zh) * 2005-03-10 2005-08-24 上海大学 一种银－碳化钨－碳电触头材料的制造方法
JPWO2009041246A1 (ja) * 2007-09-25 2011-01-20 株式会社アライドマテリアル 接点部材の製造方法、接点部材および開閉器
JP4579348B1 (ja) * 2009-03-24 2010-11-10 株式会社アライドマテリアル 電気接点材
WO2011162106A1 (ja) * 2010-06-22 2011-12-29 株式会社アライドマテリアル 電気接点材
JP5134166B2 (ja) * 2010-09-21 2013-01-30 株式会社アライドマテリアル 電気接点材

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Publication number Priority date Publication date Assignee Title
JPS52147768A (en) * 1976-06-03 1977-12-08 Sumitomo Electric Industries Electric contact material
JPS5811753A (ja) 1981-07-15 1983-01-22 Sumitomo Electric Ind Ltd 電気接点材料
JPS5811754A (ja) 1981-07-15 1983-01-22 Sumitomo Electric Ind Ltd 電気接点材料
JPH07192565A (ja) * 1993-12-24 1995-07-28 Toshiba Corp 接点材料およびその製造方法

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CN102947475A (zh) 2013-02-27
CN102947475B (zh) 2015-09-02
JP4898978B2 (ja) 2012-03-21
EP2586883A1 (en) 2013-05-01
EP2586883A4 (en) 2014-03-12
EP2586883B1 (en) 2015-11-04
JPWO2011162107A1 (ja) 2013-08-19

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