EP0480922A1 - PROCESS FOR PRODUCING A CuCr CONTACT MATERIAL FOR VACUUM SWTICHES. - Google Patents
PROCESS FOR PRODUCING A CuCr CONTACT MATERIAL FOR VACUUM SWTICHES.Info
- Publication number
- EP0480922A1 EP0480922A1 EP89906021A EP89906021A EP0480922A1 EP 0480922 A1 EP0480922 A1 EP 0480922A1 EP 89906021 A EP89906021 A EP 89906021A EP 89906021 A EP89906021 A EP 89906021A EP 0480922 A1 EP0480922 A1 EP 0480922A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- copper
- powder compact
- contact piece
- sintering
- powder
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 52
- 239000000463 material Substances 0.000 title abstract description 29
- 239000010949 copper Substances 0.000 claims abstract description 33
- 229910052802 copper Inorganic materials 0.000 claims abstract description 21
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000005245 sintering Methods 0.000 claims abstract description 19
- 238000007906 compression Methods 0.000 claims abstract description 10
- 239000007787 solid Substances 0.000 claims abstract description 7
- 150000001875 compounds Chemical class 0.000 claims abstract description 3
- 239000000843 powder Substances 0.000 claims description 36
- 238000001513 hot isostatic pressing Methods 0.000 claims description 22
- 239000011651 chromium Substances 0.000 claims description 20
- 229910052804 chromium Inorganic materials 0.000 claims description 16
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 8
- 238000002844 melting Methods 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 239000010955 niobium Substances 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000011669 selenium Substances 0.000 claims description 4
- 239000010936 titanium Substances 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 2
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 claims description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 229910052787 antimony Inorganic materials 0.000 claims description 2
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 claims description 2
- 229910052797 bismuth Inorganic materials 0.000 claims description 2
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims description 2
- 239000001257 hydrogen Substances 0.000 claims description 2
- 229910052739 hydrogen Inorganic materials 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- 239000011733 molybdenum Substances 0.000 claims description 2
- 229910052758 niobium Inorganic materials 0.000 claims description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 2
- 229910052711 selenium Inorganic materials 0.000 claims description 2
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 2
- 229910052714 tellurium Inorganic materials 0.000 claims description 2
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- 238000005056 compaction Methods 0.000 claims 2
- 239000008240 homogeneous mixture Substances 0.000 claims 2
- 238000001816 cooling Methods 0.000 claims 1
- 239000001307 helium Substances 0.000 claims 1
- 229910052734 helium Inorganic materials 0.000 claims 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims 1
- 239000011261 inert gas Substances 0.000 claims 1
- VSZWPYCFIRKVQL-UHFFFAOYSA-N selanylidenegallium;selenium Chemical compound [Se].[Se]=[Ga].[Se]=[Ga] VSZWPYCFIRKVQL-UHFFFAOYSA-N 0.000 claims 1
- 229910052715 tantalum Inorganic materials 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- 230000008595 infiltration Effects 0.000 abstract description 2
- 238000001764 infiltration Methods 0.000 abstract description 2
- 238000000280 densification Methods 0.000 abstract 2
- 238000004663 powder metallurgy Methods 0.000 abstract 1
- 238000007731 hot pressing Methods 0.000 description 8
- 239000002245 particle Substances 0.000 description 8
- 238000009826 distribution Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 239000007791 liquid phase Substances 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 238000005538 encapsulation Methods 0.000 description 3
- 239000007790 solid phase Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 238000005219 brazing Methods 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000010310 metallurgical process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000000275 quality assurance Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 210000004243 sweat Anatomy 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
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
-
- 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
-
- 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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
- B22F3/15—Hot isostatic pressing
-
- 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
-
- 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
-
- 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
Definitions
- the invention relates to a method for heating a contact piece based on copper and chromium for use in vacuum interrupters, in which a powder compact from the starting components is compressed to a residual porosity of ⁇ 1%, and to a contact piece produced in this way.
- Composite materials which consist of a conductive and at least one high-melting component and which, if necessary, also contain additives which reduce welding force or reduce the tearing current have proven to be useful as contact materials for vacuum interrupters.
- the widespread CuCr materials are a typical example.
- the high-melting component such as chromium
- the main electrically conductive component such as copper
- powder metallurgical processes are particularly suitable for the production of CuCr contact materials.
- a frequently used method for the production of such contact materials is the sintering of a Cr framework and the subsequent infiltration of the sintered skeleton with Cu, which is described, for example, in DE-A-25 21 504 or DE-B-25 36 153 .
- this method is susceptible to errors and requires considerable effort for quality assurance. Since a liquid phase is used, blanks with a clear dimension are produced, which have to be machined accordingly in order to obtain the final shape.
- the need for a self-supporting framework means that the available concentration 1 range for the high-melting component is restricted.
- the sintered bodies must be encapsulated under vacuum in order to
- isostatic hot pressing As with uniaxial hot pressing, isostatic hot pressing (HIP) also results in negligibly low residual porosities.
- HIP isostatic hot pressing
- the HIP method specified is uneconomical for industrial production of large quantities. Encapsulating the sintered body under vacuum means a cost-intensive manufacturing step; hot pressing in the liquid phase, as stated in DE-A-37 29 033 as particularly advantageous, requires complex machining work to produce the contact pads.
- DE-A-35 43 486 mentions hot isostatic pressing of encapsulated compacts for the production of contact materials based on copper and chromium.
- this method is not to be regarded as a recommendable production method, but rather only as a method for producing low-pore comparison samples, i.e. only for special cases for which a corresponding effort is justified.
- it is intended to use a molding technique with contours close to the final shape and to dispense with elaborate measures such as vacuum encapsulation.
- the object is achieved in that the compacting of the powder compact takes place in two stages, the first stage being a sintering process with compression to a closed porosity of the sintered body and the second stage being a hot isostatic pressing process (HIP) in which the workpieces are encapsulated to the final density of at least 99% space.
- HIP hot isostatic pressing process
- a closed porosity is achieved with sufficient certainty in the CuCr material produced according to the invention from about 95% space filling. In the case of non-encapsulated workpieces, the closed porosity is necessary for a HIP process in order to achieve the almost complete compression specified according to the invention.
- a mixture of Cu and Cr powder can be pressed into such a blank, the shape of which has already been selected as close as possible to the geometry of the desired contact piece or the required contact layer.
- This blank is sintered in a solid Cu phase under vacuum and / or under a reducing atmosphere in accordance with the two-stage process specified and is finally hot-pressed isostatically in the solid Cu phase. It is decisive with this sequence of processes that the hot isostatic pressing, contrary to the previous view, does not encapsulate the CuCr workpieces. Tests have shown in detail that even without encapsulation of the CuCr compacts in the course of the process according to the invention, neither additional gases are enclosed nor the chromium oxidized.
- Contact pieces produced with the method according to the invention have a high material quality due to the homogeneous distribution of the components, their high compression and extremely low porosities. This and the compression and solidification of the material achieved by means of the hot isostatic compression process result in the required good contact properties, such as high breaking capacity, dielectric strength and erosion resistance.
- the cost-effectiveness of the method according to the invention results in particular from the elimination of the vacuum capsule and, furthermore, from the fact that the contour of the compact can be selected very close to the desired final shape by sintering and hot pressing in the solid phase, so that only a small one Surface finishing is required. This also minimizes the use of materials.
- the process according to the invention can advantageously be carried out in such a way that a combined sintering-HIP process is used in which powder compacts made of copper and chromium are first sintered in a vacuum or under H 2 with little pores and then isostatically hot pressed in the same operation.
- Composite parts can also advantageously be produced with the method according to the invention: for example, contact supports made of CuCr can be used simultaneously with the contact carriers made of Cu as two-layer or two-area parts in one process. can be produced. This saves the manufacturing step of connecting - as is usually the case with brazing in a vacuum. This is a significant advantage, in particular when using supports made of solid Cu, since these supports alone cannot be adequately connected to the powder compact by a sintering process.
- FIG. 2 shows a second contact piece in a perspective view
- FIG. 3 shows a contact piece with a contact piece base in a perspective view
- FIG. 4 and FIG. 5 show micrographs of the material before and after hot isostatic pressing.
- Electrolytically produced Cr powder with a particle size distribution of 0 ⁇ 63 ⁇ m is dry mixed with Cu powder with a particle size distribution of ⁇ 40 ⁇ m in a ratio of 40:60 and to rings of dimensions (j ⁇ 600 / ⁇ . 35 x 6 mm uniaxial with a pressure of 800 MPa pressed.
- the compacts are at 1030 "C 1 h under hydrogen with a dew point -70" C and then 7 h
- a two-layer compact 1 according to FIG. 1 with disc-shaped Cu layer 2 and a frustoconical CuCr layer 3 with contact surface 4 is produced.
- the compact 1 is sintered at 1050 ⁇ C for 6 h under high vacuum at a pressure ⁇ 10 " mbar and then at 980 ⁇ C and 1000 bar argon hot isostatically pressed for about 3 h.
- the powder compact in addition to the copper and chromium, can also contain high-melting components such as iron (Fe), titanium (Ti), zircon (Zr), niobium (Nb), tan tal (Ta), molybdenum (Mo) or alloys thereof.
- high-melting components such as iron (Fe), titanium (Ti), zircon (Zr), niobium (Nb), tan tal (Ta), molybdenum (Mo) or alloys thereof.
- Easily evaporable additives such as selenium (Se), tellurium (Te), bismuth (Bi), antimony (Sb) or their compounds can also be present.
- a powder mixture according to Example 1 is pressed into disks at a pressure of 600 MPa and sintered under high vacuum with a pressure ⁇ 10 ⁇ 4 mbar at approx. 1060 ° C. for about 4 h in the HIP device. Immediately thereafter, hot isostatic pressing is carried out with 500 bar argon at 1030 ° C. for about 2 hours.
- a powder mixture of 60 m% Cu powder with particle sizes ⁇ 63 ⁇ m and 40 m% Cr powder with particle sizes ⁇ 150 ⁇ m is pressed with 750 MPa to form truncated cone-shaped contact disks 5 according to FIG. 2 with contact surfaces 6.
- slot contours 7 are simultaneously impressed perpendicular to the pressing direction. Sintering and the HIP process are carried out as in Example 2.
- a layered structure with a CuCr powder mixture for the contact layer and a Cu powder layer for producing a well-solderable base can also be used as a variant.
- a powder mixture according to Example 4 is pressed at 800 MPa to form a flat cylindrical contact pad 8 according to FIG. 3 and placed on a disc-shaped base 9 made of low-oxygen or oxygen-free (OFHC) copper before sintering.
- OFHC oxygen-free
- the pressed body 8 and the Cu disk 9 connect via sinter bridges.
- the pressing body 8 and the copper disk 9 are bonded to one another, as a result of which there is sufficient strength at the boundary layer.
- the copper base can be designed as a contact carrier or also directly as a power supply bolt 10.
- the combination of the sintering and hot pressing step is crucial to ensure high material quality. Due to the closed porosity after sintering, it can be achieved during the HIP process that no noticeable air retention occurs in the material, which can be confirmed by measurements using the following table:
Abstract
Pour la fabrication de matériaux de contacts au CuCr, on emploie fréquemment des procédés faisant appel uniquement à la métallurgie des poudres ou des procédés par frittage et infiltration. Le but recherché est d'obtenir une porosité résiduelle minimale, qui doit être inférieure à 1 %. Dans l'invention, la densification du comprimé à partir des composants est effectuée en deux étapes, dont la première est un frittage avec une densification jusqu'à l'obtention d'une porosité fermée du composé fritté et la deuxième un procédé de compression isostatique à température élevée, dans lequel les pièces non enrobées sont portées à une masse volumique finale représentant une densité relative d'au moins 99 %. On obtient ainsi un matériau d'excellente qualité pour un coût de fabrication modique. Il est possible, en particulier, de réaliser des contacts à plusieurs couches, ou des liaisons dues uniquement à la nature du matériau, entre le comprimé fritté et une base massive, par exemple un boulon de contact en cuivre.For the manufacture of contact materials with CuCr, processes are frequently used which use only powder metallurgy or sintering and infiltration processes. The aim is to obtain a minimum residual porosity, which must be less than 1%. In the invention, the densification of the tablet from the components is carried out in two stages, the first of which is a sintering with densification until a closed porosity of the sintered compound is obtained and the second an isostatic compression process at high temperature, in which the uncoated parts are brought to a final density representing a relative density of at least 99%. An excellent quality material is thus obtained for a low manufacturing cost. It is possible, in particular, to make contacts with several layers, or connections due solely to the nature of the material, between the sintered tablet and a solid base, for example a copper contact bolt.
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE89906021T DE58906658D1 (en) | 1989-05-31 | 1989-05-31 | METHOD FOR PRODUCING CuCr CONTACT PIECES FOR VACUUM SWITCHES. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/DE1989/000343 WO1990015424A1 (en) | 1989-05-31 | 1989-05-31 | PROCESS FOR PRODUCING A CuCr CONTACT MATERIAL FOR VACUUM SWTICHEs AND APPROPRIATE CONTACT MATERIAL |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0480922A1 true EP0480922A1 (en) | 1992-04-22 |
EP0480922B1 EP0480922B1 (en) | 1994-01-05 |
Family
ID=6835025
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89906021A Expired - Lifetime EP0480922B1 (en) | 1989-05-31 | 1989-05-31 | PROCESS FOR PRODUCING A CuCr CONTACT MATERIAL FOR VACUUM SWTICHES |
Country Status (5)
Country | Link |
---|---|
US (1) | US5330702A (en) |
EP (1) | EP0480922B1 (en) |
JP (1) | JPH04505985A (en) |
KR (1) | KR920702002A (en) |
WO (1) | WO1990015424A1 (en) |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2908071B2 (en) * | 1991-06-21 | 1999-06-21 | 株式会社東芝 | Contact material for vacuum valve |
DE4201940A1 (en) * | 1992-01-24 | 1993-07-29 | Siemens Ag | SINTER COMPOSITE FOR ELECTRICAL CONTACTS IN SWITCHGEAR OF ENERGY TECHNOLOGY |
DE4211319C2 (en) * | 1992-04-04 | 1995-06-08 | Plansee Metallwerk | Process for the production of sintered iron molded parts with a non-porous zone |
JP3159827B2 (en) * | 1993-03-11 | 2001-04-23 | 株式会社日立製作所 | Vacuum circuit breaker, electrode for vacuum circuit breaker and method of manufacturing the same |
TW265452B (en) * | 1994-04-11 | 1995-12-11 | Hitachi Seisakusyo Kk | |
US5760378A (en) * | 1997-04-17 | 1998-06-02 | Aerojet-General Corporation | Method of inductive bonding sintered compacts of heavy alloys |
US6248969B1 (en) | 1997-09-19 | 2001-06-19 | Hitachi, Ltd. | Vacuum circuit breaker, and vacuum bulb and vacuum bulb electrode used therefor |
CN1096322C (en) * | 1998-03-23 | 2002-12-18 | 西安理工大学 | Verticle sintering method for copper/tungsten-chromium copper integral probe |
DE10010723B4 (en) | 2000-03-04 | 2005-04-07 | Metalor Technologies International Sa | Method for producing a contact material semifinished product for contact pieces for vacuum switching devices and contact material semi-finished products and contact pieces for vacuum switching devices |
KR100400354B1 (en) * | 2000-12-07 | 2003-10-04 | 한국과학기술연구원 | Fabrication Method of Cu-Cr Contact Materials for Vacuum Switches |
US6627055B2 (en) * | 2001-07-02 | 2003-09-30 | Brush Wellman, Inc. | Manufacture of fine-grained electroplating anodes |
WO2006111175A1 (en) * | 2005-04-16 | 2006-10-26 | Abb Technology Ag | Method for producing contact makers for vacuum switching chambers |
TW200710905A (en) * | 2005-07-07 | 2007-03-16 | Hitachi Ltd | Electrical contacts for vacuum circuit breakers and methods of manufacturing the same |
EP1997574A1 (en) * | 2007-06-01 | 2008-12-03 | ABB Technology AG | Method for production of a contact piece for a switchgear assembly, as well as a contact piece itself |
EA201200001A1 (en) * | 2009-08-17 | 2012-09-28 | Юрий Иосифович Смирнов | METHOD OF MANUFACTURING COMPOSITE MATERIAL BASED ON COPPER FOR ELECTRICAL CONTACTS |
AT11814U1 (en) * | 2010-08-03 | 2011-05-15 | Plansee Powertech Ag | METHOD FOR THE POWDER METALLURGIC MANUFACTURE OF A CU-CR MATERIAL |
JP6311325B2 (en) * | 2014-01-23 | 2018-04-18 | 株式会社明電舎 | Electrode material and method for producing electrode material |
JP5920408B2 (en) * | 2014-06-16 | 2016-05-18 | 株式会社明電舎 | Method for producing electrode material |
JP6015725B2 (en) | 2014-09-11 | 2016-10-26 | 株式会社明電舎 | Method for producing electrode material |
JP6070777B2 (en) * | 2015-06-24 | 2017-02-01 | 株式会社明電舎 | Method for producing electrode material |
JP6197917B1 (en) | 2016-06-08 | 2017-09-20 | 株式会社明電舎 | Method for producing electrode material |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
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SE333437B (en) * | 1969-03-03 | 1971-03-15 | Asea Ab | |
GB1459475A (en) * | 1974-05-23 | 1976-12-22 | English Electric Co Ltd | Manufacture of contact ekements for vacuum interrupters |
DE2536153B2 (en) * | 1975-08-13 | 1977-06-08 | Siemens AG, 1000 Berlin und 8000 München | PROCESS FOR PRODUCING MULTI-LAYER CONTACT PIECES FOR VACUUM MEDIUM VOLTAGE CIRCUIT BREAKERS |
US4190753A (en) * | 1978-04-13 | 1980-02-26 | Westinghouse Electric Corp. | High-density high-conductivity electrical contact material for vacuum interrupters and method of manufacture |
JPS5837102A (en) * | 1981-08-29 | 1983-03-04 | Sumitomo Electric Ind Ltd | Production of powder parts |
DE3406535A1 (en) * | 1984-02-23 | 1985-09-05 | Doduco KG Dr. Eugen Dürrwächter, 7530 Pforzheim | Powder metallurgical process for fabricating electrical contact pieces from a copper-chromium composite material for vacuum switches |
DE3415744A1 (en) * | 1984-04-26 | 1985-10-31 | Siemens AG, 1000 Berlin und 8000 München | CONTACT ARRANGEMENT FOR A VACUUM SWITCH |
CN1003329B (en) * | 1984-12-13 | 1989-02-15 | 三菱电机有限公司 | Contacts for vacuum-break switches |
US4677264A (en) * | 1984-12-24 | 1987-06-30 | Mitsubishi Denki Kabushiki Kaisha | Contact material for vacuum circuit breaker |
JPS6274003A (en) * | 1985-09-26 | 1987-04-04 | Nippon Kokan Kk <Nkk> | Method for sintering green compact |
DE3604861A1 (en) * | 1986-02-15 | 1987-08-20 | Battelle Development Corp | Method of producing finely dispersed alloys by powder metallurgy |
JPS6362122A (en) * | 1986-09-03 | 1988-03-18 | 株式会社日立製作所 | Manufacture of electrode for vacuum breaker |
DE3729093C1 (en) * | 1987-09-01 | 1988-12-01 | Gressel Ag | Clamping device with mechanical power amplifier |
-
1989
- 1989-05-31 KR KR1019910700006A patent/KR920702002A/en not_active Application Discontinuation
- 1989-05-31 EP EP89906021A patent/EP0480922B1/en not_active Expired - Lifetime
- 1989-05-31 JP JP1505389A patent/JPH04505985A/en active Pending
- 1989-05-31 US US07/777,408 patent/US5330702A/en not_active Expired - Fee Related
- 1989-05-31 WO PCT/DE1989/000343 patent/WO1990015424A1/en active IP Right Grant
Non-Patent Citations (1)
Title |
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See references of WO9015424A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1990015424A1 (en) | 1990-12-13 |
KR920702002A (en) | 1992-08-12 |
EP0480922B1 (en) | 1994-01-05 |
US5330702A (en) | 1994-07-19 |
JPH04505985A (en) | 1992-10-15 |
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