CN101847531A - Method for fabricating contact silver-coated layer by screen printing - Google Patents
Method for fabricating contact silver-coated layer by screen printing Download PDFInfo
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- CN101847531A CN101847531A CN201010190479A CN201010190479A CN101847531A CN 101847531 A CN101847531 A CN 101847531A CN 201010190479 A CN201010190479 A CN 201010190479A CN 201010190479 A CN201010190479 A CN 201010190479A CN 101847531 A CN101847531 A CN 101847531A
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- silver
- coated layer
- contact
- sintering
- screen printing
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Abstract
The invention discloses a method for fabricating a contact silver-coated layer by screen printing. The method comprises the following steps of: preparing silver powder stuff and arranging a contact in a mold prepared in advance at first; then covering a screen mold on the mold holding the contact; slowly pouring the prepared silver stuff into the screen mold to ensure that the silver stuff slowly permeates into the surface of a silver alloy contact inside a lower mold to form a uniform silver-coated layer; after the addition of the silver stuff is finished, taking the whole lower mold having the silver contact out for sintering; and placing the mold having the silver contact into a specified sintering furnace for sintering to finish the fabrication of the silver alloy contact. The method has the advantages of avoiding a rolling composite process, discovering a new process route for fabricating the silver-coated layer of the silver alloy contact and ensuring the bonding strength of the silver-coated layer, along with simple operation, suitability for mass production and high product consistency.
Description
Technical field
The present invention relates to the manufacture method of a kind of silver alloy contact, specifically, the manufacture method of the silver alloy contact silver-coated layer manufacture method that relates to.
Background technology
The silver alloy sheet contact great majority of existing circuit breaker all exist with the form of oxide, such as sliver oxidized tin contactor materials, can not be welded direct to touching on the bridge of support, in welding process, must on the solder side of silver alloy contact, make silver-coated layer and help welding, traditional silver-coated layer manufacture method all is to rely on the compound technology of hot rolling, and silver layer and the silver alloy method by mechanical deformation is combined the formation silver-coated layer.But there is following shortcoming in this mode:
1, complex procedures comprises the making of silver alloy sheet material, the making of silver plate; And the welding of the machinery of silver plate and silver alloy plate is compound, and follow-up operations such as hot rolling;
2, technology has certain risk, mainly is silver plate and silver alloy plate machinery compound tense, and the clean-up performance of faying face requires very high, if in a single day appearance is polluted then may be caused combined strength bination to go wrong; The oxidation situation can not appear in simultaneously compound back faying face, otherwise also can influence combined strength bination, and the contact quality is caused a hidden trouble;
3, the compound sheet material of hot rolling is when the later stage punching out, and its remaining net material all is wastes, and compound unnecessary silver plate needs to reclaim, and increases cost.
Summary of the invention
The objective of the invention is in order to overcome the shortcoming and defect that prior art exists, and provide a kind of zygomite reticulated printing principle to make the method for a kind of fabricating contact silver-coated layer by screen printing of contact silver-coated layer, the silver-coated layer bond strength is strong, cost is low.
For achieving the above object, technical scheme of the present invention is may further comprise the steps:
(1) make silver paste, silver powder is added additive, stir, produce the silver paste that viscosity is fit to silk screen printing, described silver powder particle mean size is between the 200-300 order;
(2) the silver contact sheet is aligned in the sintering mold of making in advance, is provided with the die that at least one can supply one deck silver contact sheet to put in this sintering mold;
(3) beginning silk screen printing silver paste, the silk screen mould is placed on the sintering mold, after having put relative position, prefabricated silver paste is slowly poured in the silk screen mould, and adopt brush in the silk screen mould, to scrape silver paste back and forth, make the silver contact sheet surface in its sintering mold that evenly penetrates into lower floor, make the uniform silver paste layer of silver contact sheet surface coverage last layer;
(4) sintering silver contact sheet; the silver contact sheet that prints the silver paste layer is put into sintering furnace together with the sintering mold of its placement under protective atmosphere, carry out sintering; sintering temperature is in 700 ℃ of-950 ℃ of scopes; additive in the silver paste layer is removed; the silver-colored silver-coated layer that the silver contact sheet surface of formation and below combines securely; just can take out mould by sintering then, finish the making of silver contact silver-coated layer.
Further being provided with is in step (4) afterwards, also carries out following subsequent treatment,
(5) surface that will the sinter silver contact sheet that is covered with silver-coated layer takes out from sintering mold, adopt the acid soak of concentration then at 10%-15%, remove some residual impurities and the oxide layer on silver contact surface, wash after pickling is finished, remove the residual acid solution of contact surface.
Further be provided be described step (5) afterwards, also carry out following milled processed,
(6) the silver contact sheet that the surface after the pickling is covered with silver-coated layer is put into cylinder, add the taper abrasive material, after under cylinder rotates, grinding 10-15 minute, take out product, the silver contact sheet that surface after handling is covered with silver-coated layer separates with the taper abrasive material, obtains the silver contact sheet finished product that the surface is covered with silver-coated layer.
Further be provided with is step (6) to be handled obtain the silver contact sheet finished product that the surface is covered with silver-coated layer and carry out dewatered drying.
Further being provided with is that described sintering mold is that pure machining graphite is made graphite jig, arranges on this graphite jig to be provided with a plurality of dies that supply the silver contact sheet to shelve.
The protective atmosphere that further setting is described step (a 4) sintering process adopts hydrogen or other inert gases to protect.
Further being provided with is that described taper abrasive material is an aluminium oxide taper abrasive material.
The invention has the advantages that this technology avoided composite technique for rolling, found a new technology route to make the silver-coated layer of silver alloy contact.Simple to operate, be suitable for producing in batches, consistency of product is good, and the bond strength of silver-coated layer significantly improves, and can reach requirement after welding.
Below in conjunction with specification drawings and specific embodiments the present invention is done further introduction.
Description of drawings
Fig. 1 is a process chart of the present invention;
Fig. 2 arranges schematic diagram for contact piece;
Fig. 3 is the schematic diagram of silk-screen printing technique;
Fig. 4 is the sintering process schematic diagram;
Embodiment
Below by embodiment the present invention is carried out concrete description; only be used for the present invention is further specified; can not be interpreted as the qualification to protection range of the present invention, the technician in this field can make some nonessential improvement and adjustment to the present invention according to the content of foregoing invention.
Embodiment of the present utility model shown in Fig. 1-4, it is example that the silver contact sheet of present embodiment adopts the contact blade of AgCdO12, certain technical scheme of the present invention can also be used for making silver-coated layer on other silver alloy contact blades.
(1) produces the contact blade of AgCdO12, do not have the welding silver layer, be of a size of 7.5 * 7.5 * 2; Totally 10 contacts;
(2) make atomizing silver powder 1Kg, the silver powder particle mean size is at 250 orders, and the present invention can adopt the silver powder of the arbitrary parameter between 200 orders or 300 orders and the two numerical value to process fully certainly;
(3) make silver paste, silver powder and additive are added water stir evenly; Described additive is a water miscible epoxy resin additive known in the art.
(4) silk screen printing silver paste, contact blade is placed in the prefabricated sintering mold 1, proper alignment is good, the graphite jig that this sintering mold 1 of present embodiment adopts pure graphite material to process, certainly can also adopt other exotic materials to process, such as materials such as refractory ceramicses, silk screen mould 2 is placed on the graphite jig 1, silver paste is poured in the silk screen mould 2 slowly, scrapes silver paste back and forth, after about 5 minutes with brush 3, silver paste infiltrates silver contact sheet 4 surfaces fully, fill up the height that sets in advance, special printing is finished the early stage of silver paste layer and is made;
(5) graphite jig 1 that will cover the silver paste layer is put in the sintering furnace 5, adopts hydrogen shield, and sintering temperature is 850 ℃, and sintering time is 10 minutes; This step can also adopt inert gas shielding.
(6) take out the silver contact sheet, the contact is put into 10% dilute sulfuric acid and soaked 3 minutes, wash after the taking-up; Put into hexagonal plating barrel again and grind, add polishing agent and taper alumina abrasive in the grinding, approximately grind after 10 minutes and take out; Product and abrasive material after separating are put into centrifugal dehydrator with contact piece dry, take out product after about 5 minutes, finish the making of contact;
The silver contact sheet that the surface that the utility model is prepared is covered with silver-coated layer carries out the solder contacts test, and the H62 brass sheet of contact piece and 3mm thickness is carried out soldering; Scolder is selected the BAg25CuP scolder, and scolder is of a size of 5 * 5 * 0.08, and solder flux is FB102, and welding equipment is the pneumatic spot welding machine of ME-25, and welding electrode adopts graphite electrode, welding procedure such as following table:
| Squeeze time | Pressing time | Welded for 1 | Weld | 1 electric current | Welded for 2 times | Weld 2 electric currents | Dwell time |
| 25 cycles | 35 cycles | 99 cycles | ??90％ | 99 cycles | ??85％ | 25 cycles |
Remarks: welding current is the power consumption ratio.
Detect welding quality after welding is finished, adopt ultrasonic scanner and universal tensile testing machine to test respectively, the result is as follows:
| Numbering | ??1 | ??2 | ??3 | ??4 | ??5 | ??6 | ??7 | ??8 | ??9 | ??10 |
| Ratio of brazing area | ??90％ | ??92.3％ | ??96.4％ | ??88.5％ | ??91.5％ | ??99.2％ | ??96.3％ | ??93％ | ??89％ | ??97.1％ |
| Shearing force kN | ??6.1 | ??6.22 | ??6.03 | ??5.91 | ??6.43 | ??5.99 | ??6.53 | ??6.41 | ??6.33 | ??5.89 |
The result shows that the silver contact welding back welding ratio of brazing area that this technology is produced can reach more than 85%, and shearing force can reach 10kg/mm
2More than, greatly improve than traditional hot rolling technology performance.
Claims (7)
1. the method for a fabricating contact silver-coated layer by screen printing is characterized in that may further comprise the steps:
(1) makes silver paste, silver powder is added additive, add water and stir, produce the silver paste of the suitable silk screen printing of viscosity;
(2) the silver contact sheet is aligned in the sintering mold of making in advance, is provided with the die that at least one can supply one deck silver contact sheet to put in this sintering mold;
(3) beginning silk screen printing silver paste, the silk screen mould is placed on the sintering mold, after having put relative position, prefabricated silver paste is slowly poured in the silk screen mould, and adopt brush in the silk screen mould, to scrape silver paste back and forth, make the silver contact sheet surface in its sintering mold that evenly penetrates into lower floor, make the uniform silver paste layer of silver contact sheet surface coverage last layer;
(4) sintering silver contact sheet; the silver contact sheet that prints the silver paste layer is put into sintering furnace together with the sintering mold of its placement under protective atmosphere, carry out sintering; sintering temperature is in 700 ℃ of-950 ℃ of scopes; additive in the silver paste layer is removed; the silver-colored silver-coated layer that the silver contact sheet surface of formation and below combines securely; just can take out mould by sintering then, finish the making of silver contact silver-coated layer.
2. the method for a kind of fabricating contact silver-coated layer by screen printing according to claim 1 is characterized in that: in step (4) afterwards, also carry out following subsequent treatment,
(5) surface that will the sinter silver contact sheet that is covered with silver-coated layer takes out from sintering mold, adopt the acid soak of concentration about 10%-15% then, remove some residual impurities and the oxide layer on silver contact surface, wash after pickling is finished, remove the residual acid solution of contact surface.
3. the method for a kind of fabricating contact silver-coated layer by screen printing according to claim 2, it is characterized in that: described step (5) is also carried out following milled processed afterwards,
(6) the silver contact sheet that the surface after the pickling is covered with silver-coated layer is put into cylinder, add the taper abrasive material, after under cylinder rotates, grinding 10-15 minute, take out product, the silver contact sheet that surface after handling is covered with silver-coated layer separates with the taper abrasive material, obtains the silver contact sheet finished product that the surface is covered with silver-coated layer.
4. the method for a kind of fabricating contact silver-coated layer by screen printing according to claim 3 is characterized in that: step (6) is handled obtaining the silver contact sheet finished product that the surface is covered with silver-coated layer and carry out dewatered drying.
5. according to the method for claim 1 or 2 or 3 or 4 described a kind of fabricating contact silver-coated layer by screen printing, it is characterized in that: described sintering mold is that pure machining graphite is made graphite jig, arranges on this graphite jig to be provided with a plurality of dies that supply the silver contact sheet to shelve.
6. the method for a kind of fabricating contact silver-coated layer by screen printing according to claim 5 is characterized in that: the protective atmosphere of described step (4) sintering process adopts hydrogen or other inert gases to protect.
7. the method for a kind of fabricating contact silver-coated layer by screen printing according to claim 6, it is characterized in that: described taper abrasive material is an aluminium oxide taper abrasive material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101904791A CN101847531B (en) | 2010-05-31 | 2010-05-31 | Method for fabricating contact silver-coated layer by screen printing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101904791A CN101847531B (en) | 2010-05-31 | 2010-05-31 | Method for fabricating contact silver-coated layer by screen printing |
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| CN101847531A true CN101847531A (en) | 2010-09-29 |
| CN101847531B CN101847531B (en) | 2012-11-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010101904791A Active CN101847531B (en) | 2010-05-31 | 2010-05-31 | Method for fabricating contact silver-coated layer by screen printing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111037134A (en) * | 2019-12-04 | 2020-04-21 | 福达合金材料股份有限公司 | Method for reducing contact resistance of welding electric contact assembly |
| CN111253173A (en) * | 2020-03-19 | 2020-06-09 | 南京以太通信技术有限公司 | Method for manufacturing electrode by coating shielding |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4622269A (en) * | 1985-12-30 | 1986-11-11 | Gte Products Corporation | Electrical contact and process for making the same |
| JPH01289216A (en) * | 1988-05-17 | 1989-11-21 | Matsushita Electric Ind Co Ltd | Manufacture of voltage-dependent nonlinear resistance element |
| JPH0917262A (en) * | 1995-06-30 | 1997-01-17 | Copal Electron Co Ltd | Electric contact |
| CN1636167A (en) * | 2000-10-24 | 2005-07-06 | 纳诺皮尔斯技术公司 | Method and materials for printing particle-enhanced electrical contacts |
| US20060008578A1 (en) * | 2004-07-09 | 2006-01-12 | Jin-Shou Fang | Method of fabricating electrode structure of field-emission display |
-
2010
- 2010-05-31 CN CN2010101904791A patent/CN101847531B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4622269A (en) * | 1985-12-30 | 1986-11-11 | Gte Products Corporation | Electrical contact and process for making the same |
| JPH01289216A (en) * | 1988-05-17 | 1989-11-21 | Matsushita Electric Ind Co Ltd | Manufacture of voltage-dependent nonlinear resistance element |
| JPH0917262A (en) * | 1995-06-30 | 1997-01-17 | Copal Electron Co Ltd | Electric contact |
| CN1636167A (en) * | 2000-10-24 | 2005-07-06 | 纳诺皮尔斯技术公司 | Method and materials for printing particle-enhanced electrical contacts |
| US20060008578A1 (en) * | 2004-07-09 | 2006-01-12 | Jin-Shou Fang | Method of fabricating electrode structure of field-emission display |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111037134A (en) * | 2019-12-04 | 2020-04-21 | 福达合金材料股份有限公司 | Method for reducing contact resistance of welding electric contact assembly |
| CN111253173A (en) * | 2020-03-19 | 2020-06-09 | 南京以太通信技术有限公司 | Method for manufacturing electrode by coating shielding |
| CN111253173B (en) * | 2020-03-19 | 2022-11-22 | 南京以太通信技术有限公司 | Method for manufacturing electrode by coating shielding |
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| Publication number | Publication date |
|---|---|
| CN101847531B (en) | 2012-11-14 |
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Effective date of registration: 20220130 Address after: 325025 No. 308, Binhai fifth road, Wenzhou Economic and Technological Development Zone, Wenzhou City, Zhejiang Province Patentee after: Zhejiang Fuda alloy material technology Co.,Ltd. Address before: 325000 No. 518, Binhai 4th Road, Binhai Park, economic and Technological Development Zone, Wenzhou, Zhejiang Patentee before: FUDA ALLOY MATERIALS Co.,Ltd. |