EP2323148A1 - Elektrischer Kontakt und Vakuumschalter damit - Google Patents

Elektrischer Kontakt und Vakuumschalter damit Download PDF

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Publication number
EP2323148A1
EP2323148A1 EP10190812A EP10190812A EP2323148A1 EP 2323148 A1 EP2323148 A1 EP 2323148A1 EP 10190812 A EP10190812 A EP 10190812A EP 10190812 A EP10190812 A EP 10190812A EP 2323148 A1 EP2323148 A1 EP 2323148A1
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EP
European Patent Office
Prior art keywords
electric contact
vacuum
intermetallic compound
powder
copper
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.)
Withdrawn
Application number
EP10190812A
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English (en)
French (fr)
Inventor
Shigeru Kikuchi
Noboru Baba
Ayumu Morita
Masato Yabu
Kiyomi Nakamura
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Publication of EP2323148A1 publication Critical patent/EP2323148A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H01H1/0203—Contacts characterised by the material thereof specially adapted for vacuum switches
    • H01H1/0206—Contacts characterised by the material thereof specially adapted for vacuum switches containing as major components Cu and Cr
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
    • H01H11/048—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts by powder-metallurgical processes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
    • H01H33/6643—Contacts; Arc-extinguishing means, e.g. arcing rings having disc-shaped contacts subdivided in petal-like segments, e.g. by helical grooves

Definitions

  • the present invention relates to an electric contact for a vacuum interrupter, an electrode for a vacuum interrupter using the electric contact, a vacuum interrupter using the electrode, a vacuum circuit breaker using the vacuum interrupter, and a vacuum switch using the vacuum interrupter.
  • Power distribution equipments such as vacuum interrupters need small size and low prices.
  • small-sized operating systems are designed wherein a mechanical strength of electric contacts in a vacuum interrupter is lowered to make small a separation force for separating contacts welded by joule heat at the time of current interruption.
  • the electric contacts have been mainly made of sintered alloys of Cr-Cu, and as a method of lowering the mechanical strength of the contact alloys, low melting point metals such as Te are added to the alloys.
  • the low melting point metals are added as an anti-welding component or a component for suppressing roughening of the surface of the contact face after current interruption.
  • An additive amount of the low melting point metals is several % by weight, in general.
  • Patent documents are:
  • the low melting point metals may vaporize from the contacts so that the soundness of the soldered portions or a vacuum degree may be deteriorated.
  • the present invention relates to an electric contact for a vacuum interrupter having electric contacts at least one of which is made of a Cu-Cr alloy wherein Cr particles are dispersed in a Cu matrix and particles of a ternary intermetallic compound are dispersed in the Cu matrix. Particularly, the particles of the intermetallic compound are present in crystal grains of the Cu matrix and at grain boundaries of the Cu matrix or interfaces between Cr and Cu.
  • the electric contact is made of alloy consisting essentially of Cr, Cu and a ternary intermetallic compound of chromium, copper and tellurium. The alloy should preferably be free from elemental tellurium.
  • the present invention also relates to a vacuum interrupter, vacuum circuit breaker and vacuum switch.
  • Vacuum circuit breakers comprise a vacuum interrupter, a fixed side electrode having an electric contact, a movable side electrode having an electric contact, conductor terminals each being connected to the fixed side electrode or the movable side electrode, and an opening-closing means for driving the movable side electrode.
  • Vacuum switches are composed of a plurality of vacuum interrupters, which are connected in series by conductors, and an opening-closing means for driving the movable side electrodes.
  • the vacuum interrupter is equipped with a pair of the fixed side electrode and the movable side electrode.
  • the present invention is applied to at least one of electric contacts of the fixed side electrode and the movable side electrode.
  • Electrodes of the vacuum interrupters comprise a disc shape electric contact having a center aperture formed at the center thereof.
  • a plurality of slit grooves not in contact with the center aperture and the slit grooves are formed towards an outer periphery of the disc electric contact, and an electrode rod connected to the surface opposite to the arc generation surface of the disc electric contact. If a material having good electrical conductivity and interruption performance is used for the disc shape electric contact, downsizing of apparatuses such as vacuum interrupters, vacuum switches etc is realized.
  • the present inventors have discovered that a mechanism of lowering mechanical strength of Cr-Cu sintered electric contacts containing low melting point metals is caused by formation of a brittle layer at the interface between Cr particles and Cu matrix in the sintered material. That is, the low melting point metals melt during the sintering step to move into the Cu powder and the Cr powder to thereby form a ternary intermetallic compound consisting of Cr, Cu and the low melting point metal.
  • a mechanical property (fracture toughness K IC ) of the intermetallic compound it was revealed that the fracture toughness K IC was about 1/2 that of Cr particles.
  • the fracture toughness K IC is a value representing resistance to fracture; the smaller the value, the easier the fracture progresses in the welded portion.
  • the easy fracture means brittleness. Accordingly, it is thought that the brittle intermetallic compound formed at the interface between the Cr particles and Cu matrix lowers strength at the interface between the Cr powder and the Cu matrix so that the progress of the fracture was assisted to reduce the strength of the sintering material. From the above observation, distribution of the intermetallic compound in the structure is effective for lowering the strength of the sintered electric contact.
  • the inventors prepared electric contacts having a metallurgical structure comprising Cr, Cu and intermetallic compounds.
  • the intermetallic compounds are present not only at the interfaces between Cr and Cu, but also in the grains of Cu matrix and grain boundaries.
  • the intermetallic compound is used as a material for the electric contact, evaporation of the low melting point metals during the sintering step or heating by arc at the time of current interruption is suppressed so that it is possible to prevent reduction in voltage withstanding performance due to lowering of strength reduction and/or deterioration of vacuum degree.
  • the intermetallic compounds are one or more of ternary compounds selected from Cr 2 CuTe 4 and Cr 4 C U2 Te 7 -
  • the intermetallic compound are constituted by the elements, it is possible to form starting points of brittle fracture in the electric contacts without imparting adverse influence on the current interruption performance while the intermetallic compounds are contained in the electric contacts.
  • a preferable amount of Cr is 18 to 45 % by volume and a preferable amount of the intermetallic compound is 0.02 to 2 % by volume, and the balance is Cu. If the amount of Cr is less than 18 %, the voltage withstanding performance becomes insufficient. If the amount of Cr exceeds 45%, electrical conductivity becomes low and it is difficult to manufacture dense electric contacts because of reduction in sintering characteristics so that satisfactory interruption performance is not expected. If an amount of the intermetallic compound is larger than 2 % by volume, an amount of poisonous Te is too large, and there is no advantage of using the intermetallic compound in place of elemental Te.
  • a method of manufacturing the electric contacts comprises mixing Cr powder, Cu powder and powder of a ternary intermetallic compound, compression-molding the mixed powders, and sintering the molding at a temperature lower than the melting point of Cu. This method realizes relatively easy production of the electric contacts at a low cost.
  • the compression-molding of the mixed powders makes it possible to produce electric contacts of a final shape without mechanical working after the sintering.
  • the powder of the intermetallic compound is prepared by mixing powders of Cr, Cu and Te in a stoichiometric ratio of a ternary intermetallic compound to be synthesized, compression-molding the mixed powders, heating the molding at a temperature of the melting point of the intermetallic compound to synthesize the intermetallic compound, and crushing the resulting intermetallic compound.
  • powders of Cu 2 Te and Cr 2 Te 3 are mixed in a stoichiometric ratio of the ternary intermetallic compound to be synthesized, compression-molding the mixed powders, heating the molding at a temperature of the melting point of the intermetallic compound, and crushing the resulting intermetallic compound.
  • the desired ternary intermetallic compound is relatively easily prepared by these methods. Particle sizes of the powder of the intermetallic compound can be controlled by selecting degrees of crushing.
  • Sintering for preparing the electric contacts and thermal synthesis of the intermetallic compound are carried out in vacuum, inert gas atmosphere or reducing gas atmosphere to thereby prevent oxidation of the materials to keep high vacuum of a vacuum interrupter, as well as to provide desired electric contacts having a desired composition.
  • Particle sizes of powder materials for preparation of the electric contacts are preferably not larger than 104 ⁇ m for Cr powder, and not larger than 61 ⁇ m for Cu powder and the intermetallic compound. If the particles sizes are larger than the above values, homogeneity of the sintered products may not be expected to thereby melt out Cu from the contact face at the time of current interruption, which tends to occur welding or leads to instability of strength reduction effect by the intermetallic compound.
  • each comprises the electric contact of a disc shape and a reinforcing disc supporting the electric contact in an opposite face with respect to arc generating face of the electric contact.
  • the disc shape electric contact has a center aperture at the center thereof, and a plurality of slit grooves that penetrate the disc shape electric contact, the slit grooves being not in contact with the center aperture and directing towards the outer periphery of the disc shape electric contact from the center aperture.
  • An electrode rod is connected through the center aperture of the electric contact to the electric contact and the reinforcing disc.
  • the electrode using the electric contact exhibits excellent interruption performance and a small separation force of welding.
  • the vacuum interrupter is provided with a pair consisting of a fixed electrode and a movable electrode in a vacuum container, at least one of which uses the electric contact having been described heretofore.
  • a vacuum circuit breaker comprises a conductor terminal connected to the fixed electrode and the movable electrode in the vacuum interrupter and an open-close means for the movable electrode.
  • a vacuum switch comprises a plurality of the vacuum interrupters connected in series by a conductor, and an open-close means for operating the movable electrodes. The vacuum switch exhibits excellent interruption performance and current conduction performance with a small separation force for separating welded electric contacts so that the operating mechanism can be downsized to provide the vacuum switch at a low cost.
  • sintered bodies having the compositions shown in Table 1 for the electric contacts were prepared.
  • powder of the ternary intermetallic compound was prepared.
  • powders of Cu 2 Te and Cr 2 Te 3 each having a particle size of 10 ⁇ m or less were mixed in a mortar at a rate of 48.2 % by weight of Cu 2 Te and 51.8% by weight of Cr 2 Te 3 , and the mixed powders were charged into a metal mold.
  • the mixed powders were compression-molded under a pressure of 294 MPa, followed by heating at 800 °C for 1 hour in vacuum to synthesize Cr 2 CuTe 4 .
  • the resulting intermetallic compound was crushed and ground in a mortar to obtain powder of Cr 2 CuTe 4 having a particle size of 50 ⁇ m or less.
  • Cr powder having a particle size of 80 um or less, Cu powder having a particle size of 50 ⁇ m or less and the intermetallic compound powder mentioned above were mixed in mixing rates shown in Table 1 with a V-shaped mixer, and the resulting mixed powders were filled in a metal mold.
  • the charged powders were compression-molded under a pressure of 294 MPa.
  • Theoretical relative densities of the resulting moldings were about 74 %.
  • the moldings were heated in vacuum at 1060 °C for two hours to sinter the moldings to thereby obtain sintered bodies for materials of the electric contacts.
  • Theoretical relative densities of the sintered bodies were about 96 %.
  • a conventional Cr-Cu-Te sintered body which uses elemental Te was prepared in the following manner. Cr powder having a particle size of 80 ⁇ m or less, Cu powder having a particle size of 60 ⁇ m or less and Te powder having a particle size of 45 ⁇ m or less were mixed in a mortar at a mixing rate shown in No. 11 in Table 1 with a V-shaped mixer. The mixed powders were compression-molded and heated to produce a sintered body. Theoretical relative densities of the molding and the sintered body were the same as those in embodiment 1. The theoretical relative densities of the molding are relative values with respect to a theoretical density of Cr-Cu-Cr 2 CuTe 4 in Table 1. Table 1 No.
  • the conductivity was measured by an eddy current type measuring instrument.
  • the conductivity is represented as relative values (*IACS %, International Annealed Copper Standard) with respect to conductivity of annealed pure copper (100 %).
  • the conductivity greatly depends on the amount of Cr; the larger the amount of Cr, the smaller the conductivity becomes.
  • the conductivity depends little on the amount of the intermetallic compound; when the amount of Cr is 23 volume %, the conductivity (IACS) was around 45 %, which is almost the same as comparison No. 11. As the amount of the intermetallic compound increases, there is a tendency that the conductivity becomes smaller.
  • intermetallic compound was not observed at grain boundaries of Cu grains in the Cu matrix, although the intermetallic compound particles were present at grain boundaries of Cr particles and Cu matrix. This is because the intermetallic compound is formed only when Cr, Cu and Te are present at the grain boundaries of the Cr particles and Cu particles. It has been revealed that in case of addition of elemental Te, the intermetallic compound can not be present in the Cu matrix.
  • Fig. 1A shows a plan view of the electrode having the electric contact of the electrode according to the resent invention
  • Fig. 1B shown a cross sectional view of the electrode shown in Fig. 1A
  • reference numeral 1 denotes the electric contact
  • 2 the slit grooves for imparting a driving force to arc
  • 3 the reinforcing plate made of stainless steel
  • 5 a solder material for connecting the electric contact with the reinforcing plate
  • 44 the center aperture for preventing stagnation of arc that occurs in the center of the electric contact.
  • the electric contacts can be manufactured by a method wherein the mixed powders of Cr powder, Cu powder and the intermetallic compound powder are filled in a metal mold having a cavity, which is the inner shape of the electric contact shown in Figs. 1A and 1B ; the mixed powders are compression-molded, and compressed molding was heated to sinter the molding. According to this method, the desired electric contact can be manufactured easily without machining after sintering.
  • the method of manufacturing the electrode in this embodiment is as follows.
  • the electrode rod 4 made of oxygen free copper and the stainless steel reinforcing plate 3 made of SUS 304 were prepared by machining in advance. Then solders were placed between the electric contact 1 obtained by sintering and machining and the reinforcing plate 3 and between the reinforcing plate 3 and the electrode rod 4, and the assembly was heated to 970 °C for 10 minutes in vacuum of not higher than 8.2 X 10 -4 Pa to produce the electrode shown in Figs. 1A and 1B .
  • the electrode was used for a vacuum interrupter having a rated voltage of 7.2 kV, a rated current of 600 A, and a rated interruption current of 20 kA. If a mechanical strength of the electric contact is sufficiently high, the reinforcing plate can be omitted.
  • a vacuum interrupter was prepared.
  • the specifications of the vacuum interrupter are of a rated voltage of 7.2 kV, a rated current of 600 A, and a rated interruption current of 20 kA.
  • Fig. 2 shows a cross sectional view of a vacuum interrupter to which the present invention was applied.
  • 1a and 1b denote a fixed electrode side electric contact and a movable electrode side electric contact respectively.
  • 3a and 3b denote reinforcing plates, 4a and 4b a fixed electrode side electrode rod and a movable electrode side electrode rod, 6a and 6b a fixed electrode and a movable electrode.
  • the fixed side electric contact and the movable side electric contact are disposed in such a manner that the slit grooves coincide at the contact face.
  • the movable side electrode 6a is bonded by soldering to a movable side holder 12 via a movable side shield 8 for preventing dispersion of metal vapor at the time of interruption. These members are sealed by soldering in high vacuum with a fixed side end plate 9a, a movable side end plate 9b and an insulating cylinder 13, and the assembly is electrically connected to an outside conductor by means of a screw 50 of the movable side holder 12 and a screw 51 of the fixed side electrode 6a.
  • a shield 7 for preventing metal vapor at the time of interruption is disposed in the cylinder 13 to surround the electrodes, and a guide 11 for supporting a sliding part is disposed between the movable side end plate 9b and the movable side holder 12.
  • a bellows 10 is disposed between the movable side shield 8 and the movable side end plate 9b so that the movable side holder 12 is moved up and down, keeping vacuum to thereby open and close the fixed electrode 6a and the movable electrode 6b.
  • the vacuum interrupter was assembled using the electric contacts prepared in embodiment 2.
  • FIG. 3 shows the vacuum circuit breaker comprising the vacuum interrupter 14 and an operating mechanism.
  • the vacuum circuit breaker is provided with the operating mechanism located at the front side and three epoxy cylinders 15 for bundled three phases in the back side.
  • the vacuum interrupter 4 is operated by means of an operating rod 16 of the operating mechanism.1
  • a trip coil 27 is excited and a trip lever 28 trips the prop 22 to rotate the main lever 26 in an anti-clockwise direction to thereby open the electrodes.
  • the vacuum interrupter has the specifications of the rated voltage of 7.2 kV, the rated current of 600 A and the rated interruption current of 20 kA.
  • Table 2 shows the test results. Each performance is a relative value with respect to the value of the conventional Cr-Cu-Te sintered body (No. 11) .
  • a trip performance is a reverse number of welding separation force (relative value) after electricity conduction of 28 kA. Table 2 No.
  • the additive amount of Cr 2 CuTe 4 should preferably be 0.02 to 2 % by volume.
  • Nos. 9 and 10 amounts of Cr were changed.
  • No. 9 contains a small amount of Cr and No. 10 contains a large amount of Cr.
  • No. 9 containing a small amount of Cr as an anti-arc component (arc resistant component) exhibited a low voltage withstanding performance and No. 10 having a low conductivity because of a large amount of Cr exhibited a low maximum interruption current. Accordingly, an amount of Cr is preferably 18 to 45 % by volume.
  • the electric contacts can provide vacuum interrupters and vacuum circuit breakers having a reduced separation force for welded contacts, as well as excellent current interruption performance and voltage withstanding performance and the operating mechanism of electric contacts can provide vacuum interrupters and vacuum circuit breakers can be downsized.
  • the vacuum interrupter prepared in embodiment 3 was installed in a vacuum switch other than the vacuum circuit breaker.
  • Fig. 4 shows a load break switch of a pad mounted transformer that installed the vacuum interrupter prepared in embodiment 3.
  • the load break switch comprises a plurality of pairs of vacuum interrupters 14 disposed in an outer vacuum container 32, which is vacuum sealed.
  • the vacuum interrupters correspond to main circuit switches.
  • the outer vacuum container 32 is provided with an upper plate 33, a lower plate 34 and side plates 35. Peripheries of the plates are welded, and the switch is assembled with other equipments.
  • the upper plate 33 has an upper through holes 36, and the periphery of each hole is provided with an insulating upper base 37 to cover each upper hole 36.
  • a columnar movable side electrode rode 4b is inserted reciprocatingly (up and down movement) through a circular space formed in the center of each upper base 37. That is, each upper through hole 36 is stopped up (closed) with the upper base 37 and the movable side electrode rod 4b.
  • the upper plate 33 is provided reciprocatedly with outer bellows 38 along the periphery of each upper through hole 36.
  • One end of each of the outer bellows 38 in the axial direction is fixed to a lower side of the upper plate 33, and the other end in the axial direction is mounted on an outer circumference of each of the movable side electrode rods 4b. That is, in order to make the outer vacuum container 32 air-tight, the outer bellows 38 is disposed to the periphery of each upper through hole 36 in the axial direction of the movable side electrode rods 4b.
  • the upper plates 33 are provided with an evacuation pipe (not shown), through which the outer vacuum container is evacuated to vacuum.
  • the lower plate 34 is provided with lower through holes 39, and an insulating bushing 40 is fixed to a periphery of each lower through hole 39 to cover each of the lower through holes.
  • Circular lower bases 41 are fixed to the bottom of the insulating bushings 40.
  • a columnar fixed side electrode rod 4a is inserted into each of the circular spaces at the center of the lower bases 41. That is, the lower through holes 39 formed in the lower plates 34 are stopped up with the insulating bushings 40, the lower bases 41 and the fixed side electrode rods 4a.
  • One end (lower side) of the fixed side electrode rods in the axial direction is connected to a cable (distribution wires) disposed outside of the outer vacuum container 32.
  • the vacuum interrupters 14 corresponding to the main circuit switches of the load break switches are contained in the outer vacuum container 32.
  • Each of the movable side electrode rods 4b is connected to each other by means of a flexible conductor having two curved portion 42.
  • the flexible conductors 42 are constituted by alternately laminating a plurality of copper plates and a plurality of stainless steel plates, each having two curved portions in their longitudinal direction.
  • the flexible conductor 42 is provided with through holes 43 through which the movable side electrode rods 4b are inserted.
  • the vacuum interrupter prepared in embodiment 3 can be applied to the load break switch for the pod mounted transformer, as well as other vacuum switches such as vacuum switches.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Switches (AREA)
  • Contacts (AREA)
EP10190812A 2009-11-13 2010-11-11 Elektrischer Kontakt und Vakuumschalter damit Withdrawn EP2323148A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2009259401A JP2011108380A (ja) 2009-11-13 2009-11-13 真空バルブ用電気接点およびそれを用いた真空遮断器

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EP2323148A1 true EP2323148A1 (de) 2011-05-18

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JP (1) JP2011108380A (de)
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10153098B2 (en) 2015-05-01 2018-12-11 Meidensha Corporation Method for producing electrode material and electrode material
US10766069B2 (en) 2016-06-08 2020-09-08 Meidensha Corporation Method for manufacturing electrode material

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6050994B2 (ja) * 2012-09-14 2016-12-21 株式会社日立製作所 電気接点、電気接点の製造方法、電極、真空バルブ、真空開閉機器
CN103706783B (zh) * 2013-10-15 2017-02-15 陕西斯瑞新材料股份有限公司 一种高抗熔焊性CuCr40Te触头材料及其制备方法
CN114270460A (zh) * 2019-08-27 2022-04-01 三菱电机株式会社 电接点、具备电接点的真空阀及电接点的制造方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989001231A1 (en) * 1987-07-28 1989-02-09 Siemens Aktiengesellschaft Contact material for vacuum switches and process for manufacturing same
EP0314981A1 (de) * 1987-11-02 1989-05-10 Siemens Aktiengesellschaft Verfahren zur Herstellung von Schmelzwerkstoffen aus Kupfer, Chrom und wenigstens einer leichtverdampflichen Komponente sowie Abschmelzelektrode zur Verwendung bei einem derartigen Verfahren
JP2003223834A (ja) 2002-01-31 2003-08-08 Hitachi Ltd 電気接点部材とその製法
JP2005135778A (ja) 2003-10-31 2005-05-26 Hitachi Ltd 電気接点とその製造法及び真空バルブ用電極とそれを用いた真空バルブ並びに真空遮断器
JP2006140073A (ja) 2004-11-15 2006-06-01 Hitachi Ltd 電極および電気接点とその製法
EP2081200A2 (de) * 2008-01-21 2009-07-22 Hitachi, Ltd. Elektrischer Kontakt für Vakuumventile

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989001231A1 (en) * 1987-07-28 1989-02-09 Siemens Aktiengesellschaft Contact material for vacuum switches and process for manufacturing same
EP0314981A1 (de) * 1987-11-02 1989-05-10 Siemens Aktiengesellschaft Verfahren zur Herstellung von Schmelzwerkstoffen aus Kupfer, Chrom und wenigstens einer leichtverdampflichen Komponente sowie Abschmelzelektrode zur Verwendung bei einem derartigen Verfahren
JP2003223834A (ja) 2002-01-31 2003-08-08 Hitachi Ltd 電気接点部材とその製法
JP2005135778A (ja) 2003-10-31 2005-05-26 Hitachi Ltd 電気接点とその製造法及び真空バルブ用電極とそれを用いた真空バルブ並びに真空遮断器
JP2006140073A (ja) 2004-11-15 2006-06-01 Hitachi Ltd 電極および電気接点とその製法
EP2081200A2 (de) * 2008-01-21 2009-07-22 Hitachi, Ltd. Elektrischer Kontakt für Vakuumventile

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10153098B2 (en) 2015-05-01 2018-12-11 Meidensha Corporation Method for producing electrode material and electrode material
US10766069B2 (en) 2016-06-08 2020-09-08 Meidensha Corporation Method for manufacturing electrode material

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CN102064026A (zh) 2011-05-18
JP2011108380A (ja) 2011-06-02

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