CN106623947A - Copper-tungsten contact and preparation method thereof - Google Patents
Copper-tungsten contact and preparation method thereof Download PDFInfo
- Publication number
- CN106623947A CN106623947A CN201611111801.0A CN201611111801A CN106623947A CN 106623947 A CN106623947 A CN 106623947A CN 201611111801 A CN201611111801 A CN 201611111801A CN 106623947 A CN106623947 A CN 106623947A
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- CN
- China
- Prior art keywords
- copper
- tungsten
- skeleton
- preparation
- minutes
- Prior art date
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Classifications
-
- 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
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
-
- 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
- H01H1/025—Composite material having copper as the basic material
-
- 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
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
- B22F7/062—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools involving the connection or repairing of preformed parts
- B22F2007/066—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools involving the connection or repairing of preformed parts using impregnation
Abstract
The invention discloses a copper-tungsten contact and a preparation method thereof. A tungsten skeleton is pressed in a segmented manner in the height direction, the interface of the tungsten skeleton is uniformly coated with an activated element before sintering, and then the tungsten skeleton is prepared through an overall sintering method. The preparation method includes the following steps that the contact tungsten skeleton is divided into several different parts in the vertical direction according to the height, segmented profiling is conducted, and the alloy billet contact surfaces are uniformly coated with a proper amount of the activated element after profiling is completed; all billets are stacked in a crucible in order, and a proper number of copper blocks are placed around the billets. The crucible is placed in a sintering furnace, copper-tungsten alloy contact semifinished product pieces can be obtained through sintering according to certain process parameters, and finished product parts can be obtained through machining according to sizes.
Description
【Technical field】
The present invention relates to contact preparing technical field, more particularly to a kind of tungsten contact used for high-voltage switch and preparation method thereof.
【Background technology】
Refer to shown in Fig. 1 and Fig. 2, in the past tubaeform contact is as shown in figure 1, primary structure is CuW+CuCr (Cu), this
The mode that the processing of class contact is adopted is suppressed for W skeletons, sintering, infiltration copper billet obtain CuW alloys, in Jing CuW alloys and CuCr
Alloy is integral sintered can be obtained.With the continuous increase of high-voltage switch gear product electric pressure and electric current, the core to switch product
Center portion part copper tungsten contact proposes more, higher requirement.At present the structure of such contact there occurs significant change, be mainly reflected in
The contact generally CuW alloys.Preparation of such structure to contact proposes challenge, for W skeleton compacting, if directly
Flared structure is suppressed, then conventional moulded cannot be realized；If entered using the method for molding is directly taken by contact maximum gauge
Row compacting, then occur that W skeleton is inside and outside, notable difference occurs in upper and lower different parts consistency, while in the infiltration stage, copper liquid is equal
Even infiltration is also more difficult, cannot so ensure the use of contact.Even if in addition, using mould pressing method direct pressing cylinder
Shape skeleton, through machining flared structure is being obtained, and so will have larger waste to raw material and machining.
Based on this, it is necessary to provide a kind of layering compacting, integral sintered preparation method in fact, solves tubaeform contact in tungsten
The problem of the aspects such as the uniform compacting of skeleton, the infiltration of copper and machining.
【The content of the invention】
It is an object of the invention to provide a kind of copper tungsten contact and preparation method thereof, solves the bone of the larger copper tungsten of ratio of height to diameter
Prepared by frame, greatly improve the utilization rate of such part raw material, solves that in this class formation contact skeleton preparation process mould can not be adopted
The restriction of pressure.
To reach object above, the present invention is adopted the following technical scheme that and is achieved：
A kind of preparation method of copper tungsten contact, differing heights are resolved into according to the ratio of height to diameter of contact W skeleton by W skeleton
W skeleton segmentation compacting, after the completion of compacting, different W skeletons is put into order in crucible, and copper is put into inside crucible
Block, then crucible is put into sintering furnace sinter.
Before crucible is put into, its contact surface is coated with activator, in infiltration copper at the W skeleton pressed compact interface of differing heights
Before block fusing, the W skeleton of differing heights is integrally formed skeleton by activator activated sintering.
The activator is nickel powder.
The quality of activator is coated in unit area less than the 1% of tungsten.
The W skeleton suppressed respectively is will to be prepared after forming agent, induction copper powder and tungsten powder mixing.
The forming agent is paraffin, and the induction copper powder is copper powder, and in sintering process, volatilization is not remained the paraffin,
The copper powder guides the copper billet of fusing to penetrate into W skeleton after melting during infiltration.
The copper billet is fine copper, chromium-copper or chromium-zirconium-copper.
Sintering schedule is：200 DEG C are warmed up within 40 minutes from room temperature, 30 minutes are incubated；900 DEG C are warmed up within 30 minutes, insulation
10 minutes；1050 DEG C are warmed up within 10 minutes, 30 minutes are incubated, 1350 DEG C are warmed up within 10 minutes, 120 minutes are incubated, then with stove
Cooling.
A kind of copper tungsten contact, the copper tungsten contact generally copper-tungsten, in the copper-tungsten, the mass fraction of copper is 15～
35%.
Relative to prior art, the present invention has advantages below：The present invention prepare CuW alloys when, in the system of W skeleton
The standby stage, by the height direction the skeleton that W skeleton resolves into differing heights being carried out into segmentation compacting, after the completion of compacting,
Different W skeletons is stacked together again.Before stacking, the appropriate nickel powder of the region coating that contacts with each other in W skeleton, appropriate nickel
The coating of powder will improve the metallurgical binding ability at skeleton interface.The method for taking segmentation compacting, solves larger diameter, height
Skeleton cannot adopt the restriction of molding.
【Description of the drawings】
Fig. 1 is original structure of contact terminal schematic diagram；
Fig. 2 is existing contact schematic diagram；
Fig. 3 present invention compacting W skeleton segmentation pressing structures
Fig. 4 present invention prepares W skeleton preparation process；
Structure after Fig. 5 CuW alloys machinings of the present invention.
【Specific embodiment】
Below in conjunction with the accompanying drawings the present invention is described in further detail with specific embodiment.
Refer to shown in Fig. 2 and Fig. 2～5, a kind of preparation method of copper tungsten contact comprises the steps：
(1) a certain amount of paraffin, copper powder and tungsten powder are sufficiently mixed, appropriateness is dried；
(2) W skeleton is divided into different deciles according to the ratio of height to diameter of contact W skeleton to be suppressed；
(3) active element coating is carried out on the W skeleton contact surface for suppressing；
(4) W skeleton order is put into crucible, appropriate copper billet is put into inside crucible, then crucible is put into sintering furnace
It is interior；200 DEG C are heated within 40 minutes from room temperature, 30 minutes are incubated；30 minutes to 900 DEG C, it is incubated 10 minutes；It is warmed up within 10 minutes
1050 DEG C, 30 minutes are incubated, are warmed up within 10 minutes 1350 DEG C, be incubated 120 minutes, then along with the furnace cooling, obtains copper tungsten contact hair
Base.
(5) it is machined out according to accessory size, obtains fabricated part stand-by.
In the mixed powder stage of step (1), paraffin is forming agent, and copper powder is induction copper powder；Paraffin is in intensification and insulating process
Middle volatilization is not remained, and copper powder guides the copper billet of fusing to penetrate into W skeleton after melting during infiltration.W skeleton pressed compact interface exists
Before the fusing of infiltration copper billet, the nickel powder activated sintering coated by interface is integrally formed skeleton.On W skeleton contact surface, unit plane
The quality of nickel powder is coated in product less than the 1% of tungsten.The copper billet composition is fine copper, chromium-copper or chromium-zirconium-copper.
The copper tungsten contact generally copper-tungsten according to obtained in the inventive method, in the alloy, the mass fraction of copper is
15～35%.
The present invention when CuW alloys are prepared, in the preparatory phase of W skeleton, by the way that W skeleton decomposed in the height direction
Skeleton into differing heights carries out segmentation compacting, after the completion of compacting, then different W skeletons is stacked together.Before stacking,
The appropriate nickel powder of the region coating that contacts with each other in W skeleton, the coating of appropriate nickel powder will improve the metallurgical binding energy at skeleton interface
Power.Take segmentation compacting method, solve larger diameter, height skeleton cannot adopt molding restriction.
The present invention is suppressed when CuW alloy skeletons are prepared using the structure of hollow ring, is so greatly carried
The service efficiency of raw material is risen；Meanwhile, using during molding, the skeleton of hollow-core construction is conducive to the uniformity of skeleton compactness.
Claims (9)
1. a kind of preparation method of copper tungsten contact, it is characterised in that resolved into W skeleton according to the ratio of height to diameter of contact W skeleton
The W skeleton segmentation compacting of differing heights, after the completion of compacting, different W skeletons is put into order in crucible, in crucible
Portion is put into copper billet, then crucible is put into sintering furnace and is sintered.
2. the preparation method of a kind of copper tungsten contact according to claim 1, it is characterised in that：The W skeleton pressure of differing heights
Before crucible is put into, its contact surface is coated with activator at base interface, before infiltration copper billet melts, the W skeleton of differing heights
Skeleton is integrally formed by activator activated sintering.
3. the preparation method of a kind of copper tungsten contact according to claim 2, it is characterised in that：The activator is nickel powder.
4. the preparation method of a kind of copper tungsten contact according to claim 2, it is characterised in that：Coating activation in unit area
The quality of agent is less than the 1% of tungsten.
5. the preparation method of a kind of copper tungsten contact according to claim 1, it is characterised in that：The tungsten bone suppressed respectively
Frame is will to be prepared after forming agent, induction copper powder and tungsten powder mixing.
6. the preparation method of a kind of copper tungsten contact according to claim 5, it is characterised in that：The forming agent is paraffin,
The induction copper powder is copper powder, and in sintering process, volatilization is not remained the paraffin, after the copper powder melts during infiltration
The copper billet of guiding fusing penetrates into W skeleton.
7. the preparation method of a kind of copper tungsten contact according to claim 1, it is characterised in that：The copper billet is fine copper, chromium
Copper or chromium-zirconium-copper.
8. the preparation method of a kind of copper tungsten contact according to any one of claim 1 to 7, it is characterised in that：Sintering system
Spend and be：200 DEG C are warmed up within 40 minutes from room temperature, 30 minutes are incubated；900 DEG C are warmed up within 30 minutes, 10 minutes are incubated；Rise within 10 minutes
Temperature is incubated 30 minutes to 1050 DEG C, is warmed up within 10 minutes 1350 DEG C, is incubated 120 minutes, then along with the furnace cooling.
9. the copper tungsten contact that prepared by a kind of preparation method of copper tungsten contact according to any one of claim 1 to 8, it is special
Levy and be：The copper tungsten contact generally copper-tungsten, in the copper-tungsten, the mass fraction of copper is 15～35%.
Priority Applications (1)
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| CN201611111801.0A CN106623947B (en) | 2016-12-06 | 2016-12-06 | A kind of copper tungsten contact and preparation method thereof |
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| CN201611111801.0A CN106623947B (en) | 2016-12-06 | 2016-12-06 | A kind of copper tungsten contact and preparation method thereof |
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| CN106623947B CN106623947B (en) | 2018-10-30 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111863488A (en) * | 2020-07-13 | 2020-10-30 | 安徽恒均粉末冶金科技股份有限公司 | Method for preparing electric appliance switch contact by powder metallurgy copper-tungsten alloy |
| CN112530724A (en) * | 2020-10-19 | 2021-03-19 | 陕西斯瑞新材料股份有限公司 | Method for manufacturing electron beam welding copper-tungsten contact piece by using tungsten powder |
| CN112908733A (en) * | 2019-12-04 | 2021-06-04 | 西安西电高压开关有限责任公司 | Alloy arc contact, preparation method and application thereof |
| CN112908734A (en) * | 2019-12-04 | 2021-06-04 | 西安西电高压开关有限责任公司 | Heavy-current circuit breaker contact and preparation method thereof |
| CN113593992A (en) * | 2021-07-09 | 2021-11-02 | 陕西斯瑞新材料股份有限公司 | CuW-CuCr integral electrical contact with ultra-low chromium content and preparation method thereof |
| CN115821187A (en) * | 2022-12-20 | 2023-03-21 | 厦门钨业股份有限公司 | Tungsten-copper material and preparation method and application thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101353258B (en) * | 2008-08-07 | 2013-04-24 | 沈阳中科超硬磨具磨削研究所 | CBN grinding wheel of low temperature vitrified bond and preparation technique thereof |
| CN101699591B (en) * | 2009-10-30 | 2012-01-11 | 西安福莱电工合金有限公司 | Integrated contact of copper-tungsten contact part /copper or copper alloy conductive rod and preparation method thereof |
| IN2013CH05861A (en) * | 2013-12-16 | 2015-06-19 | Gen Electric |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112908733A (en) * | 2019-12-04 | 2021-06-04 | 西安西电高压开关有限责任公司 | Alloy arc contact, preparation method and application thereof |
| CN112908734A (en) * | 2019-12-04 | 2021-06-04 | 西安西电高压开关有限责任公司 | Heavy-current circuit breaker contact and preparation method thereof |
| CN112908733B (en) * | 2019-12-04 | 2024-01-26 | 西安西电高压开关有限责任公司 | Alloy arc contact, preparation method and application thereof |
| CN112908734B (en) * | 2019-12-04 | 2024-01-26 | 西安西电高压开关有限责任公司 | High-current breaker contact and preparation method thereof |
| CN111863488A (en) * | 2020-07-13 | 2020-10-30 | 安徽恒均粉末冶金科技股份有限公司 | Method for preparing electric appliance switch contact by powder metallurgy copper-tungsten alloy |
| CN112530724A (en) * | 2020-10-19 | 2021-03-19 | 陕西斯瑞新材料股份有限公司 | Method for manufacturing electron beam welding copper-tungsten contact piece by using tungsten powder |
| CN112530724B (en) * | 2020-10-19 | 2023-09-08 | 陕西斯瑞新材料股份有限公司 | Method for manufacturing electron beam welding copper-tungsten contact by using tungsten powder |
| CN113593992A (en) * | 2021-07-09 | 2021-11-02 | 陕西斯瑞新材料股份有限公司 | CuW-CuCr integral electrical contact with ultra-low chromium content and preparation method thereof |
| CN113593992B (en) * | 2021-07-09 | 2023-09-15 | 陕西斯瑞新材料股份有限公司 | CuW-CuCr integral electrical contact with ultralow chromium content and preparation method thereof |
| CN115821187A (en) * | 2022-12-20 | 2023-03-21 | 厦门钨业股份有限公司 | Tungsten-copper material and preparation method and application thereof |
| CN115821187B (en) * | 2022-12-20 | 2023-12-26 | 厦门钨业股份有限公司 | Tungsten copper material and preparation method and application thereof |
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| CN106623947B (en) | 2018-10-30 |
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Effective date of registration: 20210629 Address after: 741018 dongshili Industrial Park, Qinzhou District, Tianshui City, Gansu Province Patentee after: Tianshui Xidian the Great Wall Alloy Co.,Ltd. Patentee after: CHINA XD ELECTRIC Co.,Ltd. Address before: 710075 Shaanxi city of Xi'an province high tech Zone No. 7 Tang Xing Lu Patentee before: CHINA XD ELECTRIC Co.,Ltd. |