WO2014136617A1 - Matériaux de contact électrique, et disjoncteur - Google Patents

Matériaux de contact électrique, et disjoncteur Download PDF

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Publication number
WO2014136617A1
WO2014136617A1 PCT/JP2014/054525 JP2014054525W WO2014136617A1 WO 2014136617 A1 WO2014136617 A1 WO 2014136617A1 JP 2014054525 W JP2014054525 W JP 2014054525W WO 2014136617 A1 WO2014136617 A1 WO 2014136617A1
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Prior art keywords
electrical contact
contact material
mass
breaker
molybdenum
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PCT/JP2014/054525
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English (en)
Japanese (ja)
Inventor
隆志 畠山
上西　昇
胡間　紀人
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株式会社アライドマテリアル
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Priority to JP2015504250A priority Critical patent/JPWO2014136617A1/ja
Publication of WO2014136617A1 publication Critical patent/WO2014136617A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/0466—Alloys based on noble metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/0425—Copper-based alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
    • C22C27/04—Alloys based on tungsten or molybdenum
    • 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
    • C22C5/00—Alloys based on noble metals
    • C22C5/06—Alloys based on silver
    • 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
    • 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

Definitions

  • the present invention relates to an electrical contact material and a breaker.
  • Mo molybdenum
  • Ag silver
  • Cu copper
  • Patent Document 1 JP-A-2005-146212 discloses Ag, at least one heat-resistant non-oxide selected from the group consisting of WC, W and Mo, SnO 2 , In An electrical contact material containing at least one metal oxide selected from the group consisting of 2 O 3 , ZnO, CuO and Cu 2 O is disclosed.
  • Patent Document 2 discloses an arc resistant component that is 25% by volume or more and less than 75% by volume and is composed of at least one of Ta, Nb, W, and Mo.
  • the total amount of the arc-resistant component is 75% by volume or less
  • the auxiliary component is composed of at least one of Cr, Ti, Y, Zr, Co, and V, and the balance is composed of at least one of Cu or Ag.
  • a contact material for a vacuum valve having a conductive component is disclosed.
  • the electrical contact manufactured using the electrical contact material is incorporated into a DC breaker and the contact performance is evaluated, the molybdenum particles are not uniformly dispersed in the electrical contact material. There is a problem that the arc is difficult to cut, the interruption time is prolonged, the load on the contact is increased, and the contact performance is deteriorated. For this reason, the DC breaker is provided with a mechanism for forcibly blocking.
  • an object of the present invention is to provide an electrical contact material and a breaker capable of improving the contact performance of the breaker for both AC and DC.
  • the electrical contact material according to the present invention includes 0.1% by mass to 30% by mass of molybdenum, 10% by mass to 70% by mass of at least one selected from the group consisting of tungsten and tungsten carbide, and the balance Is an electrical contact material containing at least one selected from the group consisting of silver and copper and unavoidable impurities.
  • the maximum diameter of all molybdenum particles that can be observed within one field of view of a rectangle of 600 ⁇ m ⁇ 500 ⁇ m arbitrarily selected in each cross section is 20 ⁇ m or less. It is.
  • the electrical contact material preferably contains 10% by mass or more and 89.9% by mass or less of at least one selected from the group consisting of silver and copper.
  • the electrical contact material has a structure in which a metal is infiltrated into pores of the porous body, the porous body contains molybdenum and at least one selected from the group consisting of tungsten and tungsten carbide, and the metal is silver And at least one selected from the group consisting of copper.
  • the electrical contact material has a structure in which a porous body is sintered.
  • the porous body is selected from the group consisting of molybdenum, at least one selected from the group consisting of tungsten and tungsten carbide, and the group consisting of silver and copper. It is preferable to include at least one kind.
  • the electrical contact material preferably contains 1% by mass or more and 8% by mass or less of molybdenum.
  • the electrical contact material preferably contains at least one selected from the group consisting of tungsten and tungsten carbide in an amount of 40% by mass to 62% by mass.
  • the electrical contact material preferably contains 30% by mass or more and 59% by mass or less of at least one selected from the group consisting of silver and copper.
  • the electrical contact material of the present invention further contains 3% by mass or less of at least one material or element selected from the group consisting of graphite, iron, nickel, cobalt, chromium, tantalum, vanadium, magnesium, zinc, and tin. , Preferably.
  • the electrical contact material of the present invention is preferably used for a DC breaker.
  • the surface of the electrical contact material of the present invention is preferably plated.
  • the breaker according to the present invention is manufactured using the above-described electrical contact material.
  • the breaker of the present invention is preferably a DC breaker.
  • the method for producing an electrical contact material containing at least one kind and inevitable impurities is selected from the group consisting of molybdenum oxide powder, at least one powder selected from the group consisting of tungsten and tungsten carbide, and silver and copper.
  • the method for producing an electrical contact material of the present invention includes a step of forming a stamped body from a reduced mixed powder, a step of heat-treating the stamped body to form a porous body, and silver in the pores of the porous body. And a step of infiltrating at least one selected from the group consisting of copper.
  • the step of preparing the mixed powder includes 0.1% by mass to 30% by mass of molybdenum, 10% by mass to 70% by mass of at least one selected from the group consisting of tungsten and tungsten carbide, with the balance being silver.
  • a method of producing a mixed powder containing at least one selected from the group consisting of copper and unavoidable impurities, and the method for producing an electrical contact material of the present invention comprises a stamped body from a reduced mixed powder. It is preferable to further include a step of forming and a step of heat-treating the embossed body to form a porous body.
  • the molybdenum particles are uniformly dispersed in the electrical contact material, so that the contact of the breaker in both AC and DC Performance can be improved.
  • 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, and the fixed-side electrical contact material 31 is used in the embodiment of the present invention.
  • As an electrical contact material at least one selected from the group consisting of 0.1% by mass to 30% by mass of molybdenum (Mo), tungsten (W) and tungsten carbide (WC) is 10% by mass to 70% by mass.
  • the maximum diameter of all molybdenum particles that can be observed within one field of view of a rectangle of 600 ⁇ m ⁇ 500 ⁇ m arbitrarily selected in each cross section is 20 ⁇ m or less. It is.
  • the lower limit value of the maximum diameter of the molybdenum particles is 5 ⁇ m.
  • the maximum diameter of the molybdenum particles is controlled to 20 ⁇ m or less. Therefore, when the molybdenum particles are uniformly dispersed in the electrical contact material, the contact of the breaker in both AC and DC Performance, specifically, welding resistance, wear resistance, and temperature performance can be improved.
  • the maximum diameter of the molybdenum particles can be controlled to 20 ⁇ m or less in the electrical contact material, that is, the molybdenum particles can be uniformly dispersed in the electrical contact material. Is.
  • molybdenum powder when producing an electrical contact material containing molybdenum, molybdenum powder is used as a raw material powder.
  • molybdenum powder and other raw material powders are mixed by any conventional mixing method such as a V-type mixer, wet or dry attritor, wet or dry ball mill, the shape of the molybdenum particles is flat. Since the molybdenum particles are bonded to each other to form coarse molybdenum secondary particles, the molybdenum particles are not uniformly dispersed in the mixed powder.
  • the inventors of the present application have studied various methods for improving the dispersibility of molybdenum particles in the electrical contact material.
  • molybdenum oxide (MoO 2 ) powder is used as the raw material powder
  • the shape of the molybdenum oxide particles becomes flat even when the molybdenum oxide powder and other raw material powders are mixed using an attritor or a ball mill. It has been found that the molybdenum oxide particles do not stick to each other, and the molybdenum oxide particles can be uniformly dispersed in the mixed powder.
  • the maximum diameter of the molybdenum particles in the obtained electrical contact material is 20 ⁇ m.
  • the molybdenum particles can be uniformly dispersed in the electrical contact material. It is difficult to control the maximum diameter of molybdenum particles to less than 5 ⁇ m by the above method.
  • molybdenum is not used as a heat-resistant component or arc-resistant component for the purpose of improving heat resistance as in the case of conventional electric contact materials, but is used for the purpose of improving contact performance.
  • the molybdenum particles are uniformly dispersed in the electrical contact material, the molybdenum that is exposed and uniformly dispersed on the surface of the contact becomes molybdenum oxide by arc heat at the time of interruption.
  • arc heat is also used as the sublimation energy of molybdenum oxide. For this reason, arc energy can be made small by molybdenum sublimation.
  • the electrical contact material is particularly effective when applied to a DC breaker, and is preferably used for a solar cell breaker, for example.
  • the distance between the particles of the molybdenum particles becomes large, that is, the area of only the silver or copper exposed on the surface of the contact becomes large. Then, the above effect cannot be obtained. For this reason, a portion where the arc is difficult to break is generated, and it is difficult to improve the contact performance of the entire electrical contact.
  • tungsten or tungsten carbide as a refractory heat-resistant non-oxide is contained in an amount of 10 mass% to 70 mass%, so that the heat resistance, welding resistance, and wear resistance are constant.
  • the advantage of improvement is obtained. If the content of tungsten or tungsten carbide is less than 10% by mass, not only the above-mentioned advantages can not be obtained, but there is also a small amount of tungsten or tungsten carbide as a refractory, so that consumption is severe and heat resistance may be deteriorated. . When the content of tungsten or tungsten carbide exceeds 70% by mass, the electrical conductivity is lowered and the temperature performance may be deteriorated.
  • the content of tungsten or tungsten carbide is more preferably 40% by mass or more and 62% by mass or less.
  • the electric contact material contains 0.1% by mass or more and 30% by mass or less of molybdenum
  • an advantage of improving the above contact performance can be obtained. If the molybdenum content is less than 0.1% by mass, the amount of molybdenum oxide that sublimates at the time of interruption is reduced, so that the effect of improving the contact performance may not be sufficiently obtained.
  • the content of molybdenum exceeds 30% by mass, the amount of molybdenum oxide that sublimates at the time of blocking increases, and there is a possibility that the consumption increases.
  • the content of molybdenum is more preferably 1% by mass or more and 8% by mass or less.
  • the balance is composed of silver or copper and unavoidable impurities, but in order to ensure electrical conductivity of the contact, silver or copper should be contained in an amount of 10% by mass or more and 89.9% by mass or less. Is preferred. If the content of silver or copper is less than 10% by mass, the electrical conductivity is lowered and the temperature performance may be deteriorated. When the content of silver or copper exceeds 89.9% by mass, the ratio of the area of only the silver or copper exposed on the surface of the contact increases, which may deteriorate the welding resistance. The content of silver or copper is more preferably 30% by mass or more and 59% by mass or less.
  • the balance is graphite (Gr), iron (Fe), nickel (Ni), cobalt (Co), chromium (Cr), tantalum (Ta), vanadium (V), magnesium (Mg), zinc ( Zn), at least one material selected from the group consisting of tin (Sn), etc., an element, or a carbide of the element may be contained in a range of 0.1 mass% to 3 mass%. .
  • the electric contact material may be plated.
  • electrolytic silver (Ag) plating, electrolytic nickel (Ni) plating, electroless silver (Ag) plating, electroless nickel (Ni) plating, or a combination thereof can be employed.
  • an electrical contact material is manufactured as follows using an infiltration method or a sintering method.
  • the manufacturing method using the infiltration method includes a powder preparation process, a mixing process, a powder reduction process, a binder mixing process, a mold pressing process, a debinding process, a middle baking process, and an infiltration process.
  • the manufacturing method using the sintering method includes a powder preparation step, a mixing step, a powder reduction step, a binder mixing step, a die pressing step, a binder removal step, a middle firing step, and a sintering step. Details of each step are as follows.
  • the average particle diameter of the prepared silver (Ag) or copper (Cu) powder is 0.5 ⁇ m or more and 10 ⁇ m or less
  • the average particle diameter of the tungsten (W) or tungsten carbide (WC) powder is 0.2 ⁇ m or more and 8 ⁇ m.
  • the average particle diameter of the molybdenum oxide (MoO 2 ) powder is preferably 0.2 ⁇ m or more and 10 ⁇ m or less.
  • the portion consisting only of silver or copper exposed on the contact surface There is a risk that the area of the metal will increase and the welding performance will deteriorate.
  • the average particle size of each powder exceeds the upper limit, the distance between particles becomes large in the powder, and molybdenum particles cannot be finely dispersed in the electrical contact material, so that it consists only of silver or copper exposed on the contact surface. There is a possibility that the area of the portion becomes large and the welding performance is deteriorated.
  • 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 is insufficient, and the particles of the raw material powder may not be uniformly dispersed. When the mixing time exceeds 60 minutes, it takes time and the productivity may be deteriorated.
  • the mixed powder is held at a reduction temperature of, for example, 800 ° C. or more and 950 ° C. or less, for example, for a reduction time of 1 hour or more and 2 hours or less in a reducing gas atmosphere such as hydrogen gas.
  • a reducing gas atmosphere such as hydrogen gas.
  • Reduce By reducing the mixed powder in a reducing gas atmosphere, molybdenum oxide can be reduced and impurity oxygen adsorbed inside the mixed powder can be reduced. If the reduction temperature is less than 800 ° C., the reduction is insufficient, so that molybdenum oxide may remain. When the reduction temperature exceeds 950 ° C., the melting point of silver is exceeded, so that the mixed powder may be alloyed. If the reduction time is less than 1 hour, the reduction is insufficient, and molybdenum oxide may remain. When the reduction time exceeds 2 hours, the productivity may be deteriorated.
  • Binder mixing process finished powder production process
  • a binder is added to the reduced mixed powder so that the binder concentration is 1.0% by mass or more and 2.0% by mass or less, and the mixture is mixed, for example, for 20 minutes or more and 40 minutes or less.
  • a camphor (camphor) or an acrylic binder may be used as the binder. If the binder concentration is less than 1.0% by mass, sufficient strength of the embossed body cannot be obtained in the embossing process, which is a subsequent process, and handling may not be possible. If the binder concentration exceeds 2.0% by mass, removal of the binder becomes insufficient even if a debinding step, which is a subsequent step, is performed, and thus carbon in the binder may remain.
  • a rough machine, a V-type mixer or the like can be used as the mixer.
  • Embossing process After that, by applying a pressure of, for example, 250 MPa or more and 350 MPa or less to the obtained mixed powder, a stamped body having a predetermined volume is formed. If the pressing pressure is less than 250 MPa, the following problems may occur.
  • the infiltration process which is a subsequent process, is performed, the density before the infiltration process is reduced, so that the amount of silver or copper to be infiltrated increases, and thus a desired composition may not be obtained. is there.
  • a sintering process which is a subsequent process, is performed, the density before the sintering process is reduced, so that the sinterability is deteriorated and a sufficient density may not be obtained.
  • the press pressure exceeds 350 MPa, the following problems may occur.
  • the infiltration process which is a subsequent process, the density before the infiltration process is increased, so that the desired composition may not be obtained by reducing the amount of silver or copper to be infiltrated. is there.
  • the sintering process which is a post process, is performed, the density of the embossed body exceeds 85% in terms of the true density ratio, so the gap in the embossed body is reduced and the post process is performed in a hydrogen gas atmosphere. In the middle baking process, internal reduction becomes insufficient, and oxygen may remain.
  • the volume of the embossing body is adjusted by adjusting the pressing pressure in the embossing process so that the final composition becomes a desired composition.
  • the obtained embossed body is held at a temperature of, for example, 800 ° C. or more and 900 ° C. or less, for example, for 1 hour or more and 2 hours or less in a reducing gas atmosphere such as hydrogen gas, thereby performing the binder removal treatment. Impurity oxygen adsorbed inside the powder can be reduced by debinding the embossed body in a reducing gas atmosphere. If the treatment temperature is less than 800 ° C., the removal of the binder becomes insufficient, so that carbon in the binder may remain. When the processing temperature exceeds 900 ° C., productivity may be deteriorated. If the treatment time is less than 1 hour, removal of the binder is insufficient, and carbon in the binder may remain. If the treatment time exceeds 2 hours, the productivity may deteriorate.
  • the embossed body is held in a reducing gas atmosphere such as hydrogen gas at a temperature of, for example, 900 ° C. or more and 960 ° C. or less, for example, 1.0 hour or more and 3.0 hours or less. Is made. If the treatment temperature is less than 900 ° C., impurity oxygen is likely to remain in the porous body (inter-fired body), and there is a possibility that sufficient density cannot be obtained even if an infiltration process or a sintering process as a subsequent process is performed. is there. If the treatment temperature exceeds 960 ° C., the shrinkage of the porous body (medium-fired body) increases, and the desired composition may not be obtained.
  • a reducing gas atmosphere such as hydrogen gas
  • the treatment time is less than 1.0 hour, impurity oxygen is likely to remain in the porous body (inter-fired body), and a sufficient density cannot be obtained even if the infiltration process or sintering process, which is a subsequent process, is performed. There is a fear. When the treatment time exceeds 3.0 hours, productivity may be deteriorated.
  • the infiltration temperature exceeds 1100 ° C.
  • the shrinkage of the porous body increases during the infiltration, and the desired composition may not be obtained.
  • the infiltration time is less than 1.0 hour, the infiltration of silver or copper becomes insufficient, and a sufficient density may not be obtained. If the infiltration time exceeds 3.0 hours, the productivity may be deteriorated.
  • the electrical contact material is manufactured.
  • the fixed-side electrical contact material 31 according to Examples 101 to 128, 201 to 208, and 301 to 305 was manufactured.
  • the fixed-side electrical contact material 31 according to comparative examples 101 to 111, 201 to 203, and 301 to 302 was manufactured.
  • silver (Ag) was used as a conductive component, and an electrical contact material was produced using an infiltration method.
  • Examples 201 to 208 and Comparative Examples 103 and 201 to 203 silver (Ag) was used as a conductive component, and electrical contact materials were produced using a sintering method.
  • silver (Ag) was used as a conductive component, and electrical contact materials were produced using a sintering method.
  • copper (Cu) was used as a conductive component, and electrical contact materials were produced using an infiltration method. The manufacturing method will be described later.
  • Each of these electrical contact materials 31 is incorporated into a DC breaker and an AC breaker with a rated current value of 100 A, and is subjected to an overload test and a short circuit test, a welding test, an overload test and a short circuit test. Later, a temperature test was performed.
  • 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 maximum diameter of the molybdenum particles in the electrical contact material 31 the wear rate of the electrical contact material 31 after the overload test when incorporated in each of the DC breaker and the AC breaker, and the electrical contact material 31 after the short circuit test.
  • Table 2 shows the evaluation results of the wear rate, the welding test, and the temperature test.
  • the maximum diameter of the molybdenum particles in the electrical contact material 31 the method of the interruption test by the overload test and the short circuit test of each of the DC breaker and the AC breaker, the evaluation of the wear rate after these interruption tests, the welding test The method and evaluation and the temperature test method and evaluation will be described later.
  • An electrical contact material 31 containing molybdenum (Mo), tungsten (W), tungsten carbide (WC), graphite (Gr) and zinc (Zn) with the contents shown in Table 1 was produced as follows.
  • the silver (Ag) powder or the copper (Cu) powder having an average particle diameter of 3 ⁇ m as the balance is set so as to have the Mo content, the W content, the WC content, the Gr content and the Zn content shown in Table 1. It mixed for 45 minutes in the vacuum (100 Pa) using the dry ball mill.
  • the post-process is an infiltration process
  • the above-mentioned mixing was performed by blending an amount of Ag powder or Cu powder corresponding to 50% of the content of Ag or Cu shown in Table 1 as “remainder”.
  • the post-process is a sintering process
  • the above-mentioned mixing was performed by blending an amount of Ag powder or Cu powder corresponding to 100% of the content of Ag or Cu shown in Table 1 as “remainder”.
  • the obtained mixed powder was held in a hydrogen gas atmosphere at a temperature of 870 ° C. for 1.5 hours to reduce the mixed powder.
  • the obtained embossed body was held at a temperature of 870 ° C. for 1.5 hours in a hydrogen gas atmosphere to perform a binder removal treatment. Thereafter, the embossed body was held in a hydrogen gas atmosphere at a temperature of 950 ° C. for 2.0 hours to produce a porous body.
  • Examples 101 to 128, 301 to 305 and Comparative Examples 101, 102, 104 to 111, and 301 to 302 a silver plate or copper plate having a thickness of 1 mm was placed on the porous body obtained above, and 1050 By maintaining in a hydrogen gas atmosphere at a temperature of ° C for 2.0 hours, silver or copper was infiltrated into the porous body.
  • Example 201 to 208 and Comparative Examples 103 and 201 to 203 the porous body obtained above was sintered by being held in a hydrogen gas atmosphere at a temperature of 1050 ° C. for 2.0 hours.
  • a test for setting a 100 A DC breaker and forcibly turning on the switch in a switch OFF state to instantaneously cut off the current 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. And the consumption rate of the electrical contact material 31 after a short circuit test was computed by said (Formula 1). Table 2 shows “ ⁇ ” when the calculated consumption rate is 10% or less, “ ⁇ ” when the calculated consumption rate is 40% or less, and “X” when it exceeds 40%.
  • the welding test was DC, and a breaking current of 2000 A was set at a load voltage of 200V.
  • the test method is CO duty (direct current breaker with a rated current value of 100A is set in a circuit in which a DCA load current of 200V and a breaking current of 2000A flows, and when the switch is OFF, the switch is forcibly turned ON and instantaneously
  • the test for cutting off the current was conducted 6 times. And the welding condition of the electrical contact material 31 during a welding test or after a welding test was evaluated.
  • the short-circuit test was an alternating current, and a breaking current of 5000 A was set at a load voltage of 220V.
  • the test methods include O duty (test to cut off the current when the AC breaker switch is turned on and cut off the current) and CO duty (AC, load current 220V and rated current value in a circuit that flows 5000A at a load voltage of 220V).
  • O duty test to cut off the current when the AC breaker switch is turned on and cut off the current
  • CO duty AC, load current 220V and rated current value in a circuit that flows 5000A at a load voltage of 220V.
  • a test for setting a 100 A AC breaker and forcibly turning on the switch in a switch-off state to instantaneously cut off the current 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 welding test was an alternating current, and a breaking current of 5000 A was set at a load voltage of 265V.
  • Test methods include O duty (a test that cuts off the current when the AC breaker switch is turned on and cuts off the current) and CO duty (a circuit with a rated current value of 5000 A with a load voltage of 265 V and a flow of 5000 A).
  • O duty a test that cuts off the current when the AC breaker switch is turned on and cuts off the current
  • CO duty a circuit with a rated current value of 5000 A with a load voltage of 265 V and a flow of 5000 A.
  • a test for setting a 100 A AC breaker and forcibly turning on the switch in a switch-off state to instantaneously cut off the current 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.
  • molybdenum is contained in an amount of 0.1 mass% to 30 mass%
  • tungsten or tungsten carbide is contained in an amount of 10 mass% to 70 mass%
  • the electrical contact material 31 (Examples 101 to 128, 201 to 208, 301 to 305) so that the balance contains silver or copper and unavoidable impurities, and the maximum diameter of the molybdenum particles is 20 ⁇ m or less.
  • the consumption after the short circuit test can be reduced, welding after the interruption test can be prevented, and the temperature rise after the overload test and after the short circuit test can be suppressed. I understand that I was able to.
  • 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 can be applied to both a DC breaker and an AC breaker. Since it can be shortened, it is effective when applied to a DC breaker.
  • 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 not only in an AC breaker but also in a DC breaker.

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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)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Breakers (AREA)

Abstract

Les matériaux de contact électrique (21, 31) de l'invention incluent au moins 0,1% en masse et au plus 30% en masse d'un molybdène, et au moins 10% en masse et au plus 70% en masse d'au moins un élément choisi dans un groupe constitué d'un tungstène et d'un carbure de tungstène, le reste incluant au moins un élément choisi dans un groupe constitué d'un argent et d'un cuivre, et les impuretés inévitables. Au niveau de dix sections transversales des matériaux de contact électrique (21, 31) choisies de manière arbitraire, le diamètre maximal de l'ensemble des particules de molybdène pouvant être observées à l'intérieur d'un champ visuel rectangulaire dont la taille est de 600µm×500µm à l'intérieur de chacune de ces sections transversales, est inférieur ou égal à 20µm.
PCT/JP2014/054525 2013-03-05 2014-02-25 Matériaux de contact électrique, et disjoncteur WO2014136617A1 (fr)

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JP2018170241A (ja) * 2017-03-30 2018-11-01 富士通コンポーネント株式会社 電磁継電器
WO2019072240A1 (fr) * 2017-10-13 2019-04-18 福达合金材料股份有限公司 Procédé de préparation d'un matériau superfin de contact électrique en argent-tungstène à dispersion élevée
CN110306092A (zh) * 2019-08-13 2019-10-08 广东工业大学 一种梯度结构硬质合金及其制备方法和应用
CN110976887A (zh) * 2019-12-17 2020-04-10 哈尔滨东大高新材料股份有限公司 AgWC（T）/CuC（X）触头材料及其制备方法
US11152179B2 (en) 2017-03-27 2021-10-19 Abb Schweiz Ag Low voltage circuit breaker
CN114107726A (zh) * 2021-12-06 2022-03-01 国网江苏省电力有限公司丹阳市供电分公司 一种镁增强钨铜电触头材料及其制备方法

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11152179B2 (en) 2017-03-27 2021-10-19 Abb Schweiz Ag Low voltage circuit breaker
JP2018170241A (ja) * 2017-03-30 2018-11-01 富士通コンポーネント株式会社 電磁継電器
WO2019072240A1 (fr) * 2017-10-13 2019-04-18 福达合金材料股份有限公司 Procédé de préparation d'un matériau superfin de contact électrique en argent-tungstène à dispersion élevée
CN110306092A (zh) * 2019-08-13 2019-10-08 广东工业大学 一种梯度结构硬质合金及其制备方法和应用
CN110976887A (zh) * 2019-12-17 2020-04-10 哈尔滨东大高新材料股份有限公司 AgWC（T）/CuC（X）触头材料及其制备方法
CN110976887B (zh) * 2019-12-17 2022-02-11 哈尔滨东大高新材料股份有限公司 AgWC(T)/CuC(X)触头材料及其制备方法
CN114107726A (zh) * 2021-12-06 2022-03-01 国网江苏省电力有限公司丹阳市供电分公司 一种镁增强钨铜电触头材料及其制备方法
CN114107726B (zh) * 2021-12-06 2022-06-24 国网江苏省电力有限公司丹阳市供电分公司 一种镁增强钨铜电触头材料及其制备方法

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