CN107983967A - A kind of injection moulding preparation method of AgW electrical contacts - Google Patents
A kind of injection moulding preparation method of AgW electrical contacts Download PDFInfo
- Publication number
- CN107983967A CN107983967A CN201711077715.7A CN201711077715A CN107983967A CN 107983967 A CN107983967 A CN 107983967A CN 201711077715 A CN201711077715 A CN 201711077715A CN 107983967 A CN107983967 A CN 107983967A
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- China
- Prior art keywords
- tungsten powder
- injection moulding
- skeleton
- agw
- powder
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- 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.)
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Classifications
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- 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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/14—Making metallic powder or suspensions thereof using physical processes using electric discharge
-
- 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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/06—Metallic powder characterised by the shape of the particles
- B22F1/065—Spherical particles
-
- 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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
-
- 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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/103—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing an organic binding agent comprising a mixture of, or obtained by reaction of, two or more components other than a solvent or a lubricating agent
-
- 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
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Abstract
The present invention relates to a kind of injection moulding preparation method of AgW electrical contacts, comprise the following steps：A, tungsten powder spheroidising：The reduction tungsten powder of particle mean size 3um is selected, the radio frequency plasma nodularization platform for being 100KW with power carries out spheroidising, obtains globular tungsten powder.B, injection moulding prepares W skeleton, its step includes：S1, first add globular tungsten powder in all-in-one machine is pelletized in mixing, heats 30min, and useful load is 50% 65%, and 170 DEG C of temperature, adds binding agent；S2, inject on injection machine；S3, at 110 DEG C of temperature, using nitric acid carry out catalysis degreasing, the time for 3 it is small when；S4, sintering：Using molybdenum filament sintering furnace, hydrogen is passed through, when sintering 2 is small at 1450 DEG C, forms W skeleton；C, infiltration is handled：Silver content is calculated according to alloy designations, 1 2mm thickness silver strips are overlayed W skeleton in the following, being handled with meshbeltfurnace infiltration.Even tissue of the present invention, density is high, good electrical property, production efficiency and production environmental protection.
Description
Technical field
The present invention relates to a kind of preparation method of electrical contact, more particularly to a kind of injection moulding preparation side of AgW electrical contacts
Method.
Background technology
Electrical contact plays connection, carrying and breaking current, its performance and largely determines the property of breaker
Energy and reliability of operation.Good contact material requires：1. good electrical and thermal conductivity performance 2. good arc resistant scaling loss
Ability 3. good fusion welding resisting ability, 4. high-compactness.Silver has electric-conductivity heat-conductivity high performance, and there is tungsten high-melting-point, high resistance to electricity to burn
Corrosion energy, silver tungsten have both excellent performances concurrently.Therefore silver-colored tungsten electrical contact be widely used in all kinds of universal circuit breakers,
On heavy burden load switch, tap changer etc..For silver tungsten contact material, to better meet requirement, even tissue (i.e. silver and
Tungsten is uniformly distributed), high frame strength, high density it is most important.
The main preparation methods of current silver tungsten contact are powder metallurgic method and infiltration method.Powder metallurgic method be by silver powder and
Tungsten powder is with conventional mixed powder, compacting, sintering, contact is prepared in pressure technique again.Since silver powder and tungsten powder are in granularity and density
Differ greatly, when mixed powder is easily segregated and causes material structure uneven, and when compacting is also easily layered；And the powder that the method is mixed to get
Last poor fluidity, it is difficult to adapt to mo(u)ldenpress filler requirement.
Infiltration method is first suppressed containing a small amount of silver-colored W skeleton (induction silver during as infiltration), and the pre-burning of skeleton elder generation obtains certain
After intensity, then skeleton and silver strip are stacked and are placed in sintering furnace, liquid phase is carried out more than silver point and is passed through around knot, the silver of molten state
Capillarity is filled into matrix porosity, forms the silver tungsten of densification.The preparation of argentiferous W skeleton powder is divided into ball milling mixing
Method and Chemical coating method.Patent CN104480335A uses ball milling mixing method, can also exist and mix non-uniform problem.Chemistry bag
Covering method (such as patent CN102392170A) is restored with after the doping of the complex solution of tungsten powder and silver, obtains coated tungsten powder, should
Method uses toxic chemical substance during preparing, and brings security risk, and substantial amounts of waste water is produced in production process, and there are sewage
The problem of processing and environmental pollution
Patent CN204912775U is made by chemically reacting again after the salting liquid mixing using the precursor solution and tungsten of silver
Standby silver tungsten mixed-powder, then prepares contact, there is also the problem of safety and environmental pollution for the method with powder metallurgic method.
The problem of main silver tungsten contact preparation method is there are process route length at present, and structural homogenity is poor, chemical method is again
The problems such as in the presence of pollution.And current preparation method and does not consider influence of the tungsten powder pattern to contact performance, the tungsten powder in contact
It is irregular pattern mostly, when contact is cut-off, sharp corner activity is more prone to ablation greatly, so as to influence performance and the longevity of contact
Life.
The content of the invention
The object of the present invention is to provide a kind of even tissue, density is high, good electrical property, production efficiency and production environmental protection
The injection moulding preparation method of AgW electrical contacts.
Realizing the technical solution of the object of the invention is：The present invention comprises the following steps：
A, tungsten powder spheroidising：Select the reduction tungsten powder of particle mean size 3um, the radio frequency plasma ball for being 100KW with power
Change platform and carry out spheroidising, obtain globular tungsten powder；
B, injection moulding prepares W skeleton, its step includes：
S1, first add globular tungsten powder in all-in-one machine is pelletized in mixing, heats 30min, useful load 50%-65%, temperature
170 DEG C, add binding agent；
S2, inject on injection machine, 120 DEG C of mould temperature, 170 DEG C, injection pressure 150MPa of material temperature, injection speed
50cm3/ s,
S3, at 110 DEG C of temperature, using nitric acid carry out catalysis degreasing, the time for 3 it is small when；
S4, sintering：Using molybdenum filament sintering furnace, hydrogen is passed through, when sintering 2 is small at 1450 DEG C, forms W skeleton；
C, infiltration is handled：Silver content is calculated according to alloy designations, 1-2mm thickness silver strips are overlayed W skeleton in the following, using net
The infiltration processing of band stove.
Anode voltage 6KV during spheroidising in above-mentioned steps A, and be as side gas, side throughput using argon gas and hydrogen：
Argon gas 6m3/ h, hydrogen 0.6m3/h；Middle throughput 2m3/h；Chamber pressure is 65KPa-85KPa；For being loaded into the loading of powder
The flow velocity of gas is 4-10L/min, powder feeding rate 100g/min.
The mass ratio of each component is POM in binding agent described above：45-50%, PP：45-50%, surface modifier 2%-
10%.
The concentration of above-mentioned nitric acid is 95%.
The present invention has positive effect：(1) even tissue of the present invention, density are high：It is prepared by globular tungsten powder injection molding method
W skeleton cavity be evenly distributed, and be all perforate, be conducive to infiltration and obtain high density；
(2) spherical globular tungsten powder is without wedge angle in the present invention, and arc resistant ablation property is more preferable, therefore its electrical property is also relatively more prominent
Go out；
(3) present invention need not use the water process such as toxic chemical, no soda acid, therefore produce environmental protection；
(4) injection moulding of the present invention is more efficient than prior powder metallurgy, therefore production efficiency is high.
Embodiment
(embodiment 1)
The present invention comprises the following steps：
A, tungsten powder spheroidising：Select the reduction tungsten powder of particle mean size 3um, the radio frequency plasma ball for being 100KW with power
Change platform and carry out spheroidising, obtain globular tungsten powder；
B, injection moulding prepares W skeleton, its step includes：
S1, first add globular tungsten powder in all-in-one machine is pelletized in mixing, heats 30min, useful load 50%-65%, temperature
170 DEG C, add binding agent；
S2, inject on injection machine, 120 DEG C of mould temperature, 170 DEG C, injection pressure 150MPa of material temperature, injection speed
50cm3/ s,
S3, at 110 DEG C of temperature, using nitric acid carry out catalysis degreasing, the time for 3 it is small when；
S4, sintering：Using molybdenum filament sintering furnace, hydrogen is passed through, when sintering 2 is small at 1450 DEG C, forms W skeleton；
C, infiltration is handled：Silver content is calculated according to alloy designations, 1-2mm thickness silver strips are overlayed W skeleton in the following, using net
The infiltration processing of band stove.
Anode voltage 6KV during spheroidising in the step A, and be as side gas, side throughput using argon gas and hydrogen：
Argon gas 6m3/ h, hydrogen 0.6m3/h；Middle throughput 2m3/h；Chamber pressure is 65KPa-85KPa；For being loaded into the loading of powder
The flow velocity of gas is 4-10L/min, powder feeding rate 100g/min.
The mass ratio of each component is POM in the binding agent：45%, PP：45%, surface modifier 10%.
The concentration of the nitric acid is 95%.
(embodiment 2)
The present invention comprises the following steps：
A, tungsten powder spheroidising：Select the reduction tungsten powder of particle mean size 3um, the radio frequency plasma ball for being 100KW with power
Change platform and carry out spheroidising, obtain globular tungsten powder；
B, injection moulding prepares W skeleton, its step includes：
S1, first add globular tungsten powder in all-in-one machine is pelletized in mixing, heats 30min, useful load 50%-65%, temperature
170 DEG C, add binding agent；
S2, inject on injection machine, 120 DEG C of mould temperature, 170 DEG C, injection pressure 150MPa of material temperature, injection speed
50cm3/ s,
S3, at 110 DEG C of temperature, using nitric acid carry out catalysis degreasing, the time for 3 it is small when；
S4, sintering：Using molybdenum filament sintering furnace, hydrogen is passed through, when sintering 2 is small at 1450 DEG C, forms W skeleton；
C, infiltration is handled：Silver content is calculated according to alloy designations, 1-2mm thickness silver strips are overlayed W skeleton in the following, using net
The infiltration processing of band stove.
Anode voltage 6KV during spheroidising in the step A, and be as side gas, side throughput using argon gas and hydrogen：
Argon gas 6m3/ h, hydrogen 0.6m3/h；Middle throughput 2m3/h；Chamber pressure is 65KPa-85KPa；For being loaded into the loading of powder
The flow velocity of gas is 4-10L/min, powder feeding rate 100g/min.
The mass ratio of each component is POM in the binding agent：50%, PP：45%, surface modifier 5%.
The concentration of the nitric acid is 95%.
Particular embodiments described above, has carried out the purpose of the present invention, technical solution and beneficial effect further in detail
Describe in detail it is bright, it should be understood that the foregoing is merely the present invention specific embodiment, be not intended to limit the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done, should be included in the guarantor of the present invention
Within the scope of shield.
Claims (4)
- A kind of 1. injection moulding preparation method of AgW electrical contacts；Its feature is comprising the following steps：A, tungsten powder spheroidising：The reduction tungsten powder of particle mean size 3um is selected, the radio frequency plasma nodularization for being 100KW with power is put down Platform carries out spheroidising, obtains globular tungsten powder；B, injection moulding prepares W skeleton, its step includes：S1, first add globular tungsten powder in all-in-one machine is pelletized in mixing, heats 30min, useful load 50%-65%, temperature 170 DEG C, add binding agent；S2, inject on injection machine, 120 DEG C of mould temperature, 170 DEG C, injection pressure 150MPa, injection speed 50cm of material temperature3/ S,S3, at 110 DEG C of temperature, using nitric acid carry out catalysis degreasing, the time for 3 it is small when；S4, sintering：Using molybdenum filament sintering furnace, hydrogen is passed through, when sintering 2 is small at 1450 DEG C, forms W skeleton；C, infiltration is handled：Silver content is calculated according to alloy designations, 1-2mm thickness silver strips are overlayed W skeleton in the following, using meshbeltfurnace Infiltration processing.
- A kind of 2. injection moulding preparation method of AgW electrical contacts according to claim 1, it is characterised in that：The step A Anode voltage 6KV during middle spheroidising, and be as side gas, side throughput using argon gas and hydrogen：Argon gas 6m3/ h, hydrogen 0.6m3/h；Middle throughput 2m3/h；Chamber pressure is 65KPa-85KPa；The flow velocity of loading gas for being loaded into powder is 4- 10L/min, powder feeding rate 100g/min.
- A kind of 3. injection moulding preparation method of AgW electrical contacts according to claim 2, it is characterised in that：It is described The mass ratio of each component is POM in binding agent：45-50%, PP：45-50%, surface modifier 2%-10%.
- A kind of 4. injection moulding preparation method of AgW electrical contacts according to claim 3, it is characterised in that：The nitric acid Concentration be 95%.
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| CN201711077715.7A CN107983967A (en) | 2017-11-06 | 2017-11-06 | A kind of injection moulding preparation method of AgW electrical contacts |
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| CN201711077715.7A CN107983967A (en) | 2017-11-06 | 2017-11-06 | A kind of injection moulding preparation method of AgW electrical contacts |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108941572A (en) * | 2018-06-26 | 2018-12-07 | 深圳市鑫迪科技有限公司 | The preparation method of feeding for metal powder injection molding |
| CN111041546A (en) * | 2019-12-07 | 2020-04-21 | 福达合金材料股份有限公司 | Method for manufacturing silver-tungsten electrical contact with continuous silver layer on surface and product thereof |
| CN111647826A (en) * | 2020-06-15 | 2020-09-11 | 江苏精研科技股份有限公司 | Method for preparing antibacterial stainless steel by adopting powder injection molding process |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101633986A (en) * | 2008-07-25 | 2010-01-27 | 比亚迪股份有限公司 | Method for preparing silver-tungsten composite material |
| CN101805839A (en) * | 2010-04-23 | 2010-08-18 | 东北大学 | Preparation method of secondary skeleton infiltration alloy material |
| CN102162055A (en) * | 2011-04-08 | 2011-08-24 | 福州博力达机电有限公司 | Method for preparing a tungsten-copper composite material with high arc ablation resistance |
| WO2015118402A1 (en) * | 2014-02-07 | 2015-08-13 | Pontificia Universidad Javeriana | Method for manufacturing a thin film consisting of a colloidal crystal infiltrated with the luminescent mdmo-ppv polymer made of silica (sio2) spheres, having a face-centered cubic system (fcc) |
| CN105499574A (en) * | 2015-12-16 | 2016-04-20 | 北京科技大学 | Method for preparing specially-shaped porous tungsten product with uniform pores |
| CN105734332A (en) * | 2016-04-29 | 2016-07-06 | 合肥工业大学 | Preparation method for porous tungsten bulk material with uniform and controllable pores |
| CN106435319A (en) * | 2016-12-15 | 2017-02-22 | 四川恒珲新材料科技有限公司 | Tungsten-copper alloy and production method thereof |
| CN106636826A (en) * | 2016-12-07 | 2017-05-10 | 杭州正驰达精密机械有限公司 | Tungsten-gold alloy material and preparation method thereof |
-
2017
- 2017-11-06 CN CN201711077715.7A patent/CN107983967A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101633986A (en) * | 2008-07-25 | 2010-01-27 | 比亚迪股份有限公司 | Method for preparing silver-tungsten composite material |
| CN101805839A (en) * | 2010-04-23 | 2010-08-18 | 东北大学 | Preparation method of secondary skeleton infiltration alloy material |
| CN102162055A (en) * | 2011-04-08 | 2011-08-24 | 福州博力达机电有限公司 | Method for preparing a tungsten-copper composite material with high arc ablation resistance |
| WO2015118402A1 (en) * | 2014-02-07 | 2015-08-13 | Pontificia Universidad Javeriana | Method for manufacturing a thin film consisting of a colloidal crystal infiltrated with the luminescent mdmo-ppv polymer made of silica (sio2) spheres, having a face-centered cubic system (fcc) |
| CN105499574A (en) * | 2015-12-16 | 2016-04-20 | 北京科技大学 | Method for preparing specially-shaped porous tungsten product with uniform pores |
| CN105734332A (en) * | 2016-04-29 | 2016-07-06 | 合肥工业大学 | Preparation method for porous tungsten bulk material with uniform and controllable pores |
| CN106636826A (en) * | 2016-12-07 | 2017-05-10 | 杭州正驰达精密机械有限公司 | Tungsten-gold alloy material and preparation method thereof |
| CN106435319A (en) * | 2016-12-15 | 2017-02-22 | 四川恒珲新材料科技有限公司 | Tungsten-copper alloy and production method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 李保强等: "热等离子制备球形纳微钨粉及烧结性能和应用", 《中国钨业》 * |
| 殷为宏等: "《难熔金属材料与工程应用》", 30 June 2012, 冶金工业出版社 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108941572A (en) * | 2018-06-26 | 2018-12-07 | 深圳市鑫迪科技有限公司 | The preparation method of feeding for metal powder injection molding |
| CN111041546A (en) * | 2019-12-07 | 2020-04-21 | 福达合金材料股份有限公司 | Method for manufacturing silver-tungsten electrical contact with continuous silver layer on surface and product thereof |
| CN111041546B (en) * | 2019-12-07 | 2021-06-01 | 福达合金材料股份有限公司 | Method for manufacturing silver-tungsten electrical contact with continuous silver layer on surface and product thereof |
| CN111647826A (en) * | 2020-06-15 | 2020-09-11 | 江苏精研科技股份有限公司 | Method for preparing antibacterial stainless steel by adopting powder injection molding process |
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Application publication date: 20180504 |