CN101866761B - Preparation method for silver graphite-silver composite electrical contact material and antioxidant coating special for same - Google Patents
Preparation method for silver graphite-silver composite electrical contact material and antioxidant coating special for same Download PDFInfo
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- CN101866761B CN101866761B CN 201010187520 CN201010187520A CN101866761B CN 101866761 B CN101866761 B CN 101866761B CN 201010187520 CN201010187520 CN 201010187520 CN 201010187520 A CN201010187520 A CN 201010187520A CN 101866761 B CN101866761 B CN 101866761B
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Abstract
The invention relates to a preparation method for an extrusion silver graphite-silver composite electrical contact material and an antioxidant coating special for the same. The preparation method comprises the following steps of: mixing silver powder and graphite powder, sintering and extruding the mixture into a wire or a strip which has the graphite arranged in a fiber shape; cutting the silver-graphite wire into sheets with a certain thickness, and hot pressing the silver-graphite strip repeatedly to achieve a certain thickness; rolling patterns on one side of the silver-graphite sheet, coating antioxidants on the pattern-free side of the cleaned silver-graphite sheet and one side of the cleaned strip, and heating in a decarburizing furnace for decarburization; and removing the antioxidants, finish rolling the strip, and stamping or cutting the strip into the set specification to obtain the silver graphite-silver composite electrical contact material of which one side is provided with a pure silver composite layer. The silver graphite-silver composite electrical contact material has the advantages of simple preparation method, low production cost, high processing efficiency, uniform composite silver layer, high bonding strength of the composite layer, high welding performance, good working surface protection and suitability for mass production.
Description
Technical field
The invention belongs to the electrical contact material technical field, specifically relate to a kind of preparation method of silver graphite-silver composite electrical contact material.
Background technology
The silver graphite-silver composite electrical contact material material is because it has excellent resistance fusion welding; Low and stable contact resistance and being applied in widely in the protection switch; Like breaker of plastic casing MCCB, miniature circuit breaker MCB, earth leakage circuit-breaker or motor protection switch, normal and AgNi, AgW, AgWC and Cu constitute asymmetric counterpart contact.
Adopt the hot extrusion mode to process, can make graphite granule obtain strong taxis, make graphite be fibrous and be distributed in the silver matrix.Therefore, the extrusion pressing type silver graphite-silver composite electrical contact material has higher density, anti-arc erosion ability, wear-resistant ability and lower resistivity than traditional mold pressing type silver graphite-silver composite electrical contact material.
In the prior art; The extrusion pressing type silver graphite-silver composite electrical contact material mainly contains two kinds of manufacturing approaches, and a kind of is to squeeze out silver-colored graphite silk material, then silk is cut into certain thickness; With the two-sided decarburization in stove of silver-colored graphite flake; And then remove one side decarburization silver layer, and obtaining the contact that one side has fine silver composite welding layer like this, it is very high to equipment requirements to remove one side decarburization silver layer operation in this method; Be difficult to guarantee that the dimensioned precision guarantees production efficiency again, make that the production cost is higher, rate of finished products is low; A kind of in addition method is to utilize special extrusion equipment to squeeze out band; When extruding, just make the compound one deck fine silver of one side of band; The specification that becomes to require through rolling stamping-out then; This method needs special extrusion equipment, equipment cost height, equally yet has problems such as low, the compound silver layer bond strength of rate of finished products is good inadequately in addition.
Summary of the invention
The objective of the invention is in order to overcome the shortcoming and defect that prior art exists; A kind of operation is simple, production cost is low, working (machining) efficiency is high and provide, and can effectively control product size, guarantee the processing method of the extrusion pressing type silver graphite-silver composite electrical contact material that all even composite bed bond strength of composite bed thickness is high.
Another object of the present invention provides the preparation antioxidant coating special of a kind of silver graphite-silver composite electrical contact material that is applicable to above-mentioned processing method.
For realizing first purpose of the present invention, technical scheme of the present invention is to include following steps: what this step prepared is silver graphite-silver composite sheet form,
(1) silver powder and graphite powder are mixed, be squeezed into the silk material that graphite is fibrous arrangement through oversintering;
(2) be sliced into silver-colored graphite flake with the stretching processing of silk material and with it;
(3) silver-colored graphite flake degreasing, dedusting, polishing, oven dry are handled;
(4) antioxidant coating special is coated in arbitrary of silver-colored graphite flake and forms the anti-oxidation protection layer, put into the oxidizing atmosphere decarburization then, forming one side is the silver layer face, 600-850 ℃ of its decarburization temperature;
(5) remove the surperficial anti-oxidation protection layer of silver-colored graphite flake, obtain finished product.
The deflection that the vertical pulling of stretching processing pulls out in the wherein said step (2) is 0.05～0.50mm, drawing speed 0.1～1m/s.Also on arbitrary in the silver-colored graphite flake, shut out the identification decorative pattern between described step (2) and the step (3), special-purpose antioxidant coating is coated in silver-colored graphite flake and does not discern on the another side of decorative pattern in described (4).
The slice thickness of silk material is 0.3～4mm in the said step (2).
The method of described removal anti-oxidation protection layer is in greater than 60 ℃ hot water, to soak and be stirred to not a half minute.
In addition, can also prepare silver graphite-silver composite strip form, may further comprise the steps:
(1) silver powder and graphite powder are mixed, be squeezed into the band that graphite is fibrous arrangement through oversintering;
(2) with band after hot rolling is repeatedly handled, handle through degreasing, dedusting, polishing, oven dry;
(3) antioxidant coating special is coated in arbitrary of band and forms the anti-oxidation protection layer, put into the oxidizing atmosphere decarburization then, forming one side is the silver layer face, 600-850 ℃ of its decarburization temperature;
(4) the anti-oxidation protection layer of removal strip surface;
(5) band is carried out finish rolling and handle, stamping-out becomes the finished product of given size.
Band hot rolling processing is in tube furnace, to heat in the wherein said step (2), 600～900 ℃ of heating-up temperatures, 0.5～10 minute heating time.In the said step (5) band is carried out on the silver layer face, rolling out the identification decorative pattern when finish rolling is handled, and then carry out stamping-out.The method of described removal anti-oxidation protection layer is in greater than 60 ℃ hot water, to soak and be stirred to not a half minute.
For realizing another object of the present invention; Technical scheme of the present invention is that this antioxidant coating includes oxidation inhibitor and polar solvent; Described oxidation inhibitor is the mixture of a kind of silicate, chrome green and boride, and said oxidation inhibitor adopts polar solvent that oxidation inhibitor is stirred into starchy antioxidant coating.
The described particularly silicate of this setting is Al
2O
32SiO
22H
2O and K
2OnSiO
2, described boride is AlB
2, and the ratio of quality and the number of copies of said components is:
Al
2O
32SiO
22H
28～12 parts of O;
K
2OnSiO
20.5～1 part;
Cr
2O
32～3 parts;
AlB
2 8～10；
Described polar solvent is water or ethanol or acetone, and the mass ratio of oxidation inhibitor total amount and polar solvent is 1: 10～2: 1.
The invention has the advantages that: the present invention squeezes out whole silver-colored graphite material earlier; Adopt silicate, chrome green, boride pasty state antioxidant coating to add the one side that is coated in the contact, silicate and boride are fine and close solid, shaped when heating, when decarburization, add the one side silver graphite and the oxygen that have been coated with oxidation inhibitor like this and isolate; Be protected; Do not formed decarburization silver layer face, realized the compound silver layer of single face decarburization, produce silver graphite-silver composite electrical contact material by protective surface.Advantages such as it is simple that this method has the preparation method, and production cost is low, and working (machining) efficiency is high, and compound silver layer is even, and the composite bed bond strength is high, and welding performance is good, and the working face protection is good.
Below in conjunction with Figure of description and embodiment the present invention is done further introduction.
Description of drawings
Fig. 1 sheet material flow process chart of the present invention;
Fig. 2 band flow process chart of the present invention;
Embodiment
Through embodiment the present invention is carried out concrete description below; 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 1, and with reference to Fig. 1, this is the technological process that the present invention produces the silver graphite-silver composite sheet.
(1) silver powder and graphite powder is even according to 95: 5 mixed, static pressure such as process, sintering circuit squeeze out the silver-colored graphite silk of 6mm * 6mm specification; The proportioning of silver powder and graphite powder is that decide according to the compound performance of the silver graphite-silver of needed production this area, by those of ordinary skill in the art is known.
(2) silver-colored graphite silk vertical pulling is pulled out processing, deflection 0.2mm, drawing speed 0.5m/s; In this step, deflection between 0.05～0.50mm all can, be that 0.05mm or deflection are 0.50mm such as deflection, the preferred 0.2mm of present embodiment deflection, comparatively moderate; In addition in this step drawing speed between 0.1～1m/s all can, such as drawing speed 0.1m/s or drawing speed 1m/s, the preferred 0.5m/s of present embodiment drawing speed, comparatively moderate;
(3) silver-colored graphite silk is cut into the thick sheet of 1mm; In this step, slice thickness between 0.3～4mm all can, be that 0.3mm or slice thickness are 4mm such as slice thickness, the present embodiment slice thickness is 1mm, and is comparatively moderate;
(4) the arbitrary face with silver-colored graphite flake shuts out the identification decorative pattern; Because the decarburization silver layer face of silver graphite-silver composite sheet is similar with the silver-colored graphite face outward appearance of not decarburization, therefore is provided with and discerns decorative pattern and prevent that the silver graphite-silver composite sheet of finished product from obscuring on the two sides when in use.
(5) silver-colored graphite flake is handled through cleaning, polish, drying;
The ratio of (6) getting alumina silicate, potassium silicate, chrome green, aluminium boride is 10: 1: 3: 10, and water allotment oxidation inhibitor powder, the ratio of water and oxidation inhibitor powder is 1: 3; On the no decorative pattern face of silver-colored graphite flake, add to be coated with and allocate good oxidation inhibitor, oxidation inhibitor thickness is 0.5mm, and decarburization is 30～60 minutes in crawler type decarburization stove; Preferred decarburization 40 minutes; 600～850 ℃ of decarburization temperature, preferred 650 ℃, practical decarburized depth 0.15mm.
(7) contact after immersion and the continuous stirring decarburization in 80 ℃ of hot water after 2 minutes is pulled the contact out; The hot water of temperature between 60 ℃-100 ℃ all can, present embodiment is preferably 80 ℃.
(8) silver graphite-silver composite electrical contact is cleaned, polishes, dries processing, obtain the silver graphite-silver composite electrical contact material of the vertical and working face of graphite fibre direction.
Embodiment 2, and with reference to Fig. 2, this is the technological process that the present invention produces the silver graphite-silver composite strip, and concrete steps are following.
(1) silver powder and graphite powder is even according to 97: 3 mixed, static pressure such as process, sintering circuit squeeze out the thick silver-colored graphite tape of 2.4mm;
(2) it is thick silver-colored graphite tape repeatedly to be hot-rolled down to 0.8mm, and hot rolling was heated in tubular heater 0.5～10 minute, under rolling equipment auxiliary, carries out, and the hot rolling heating-up temperature is 600 ℃～900 ℃, preferably adopts 750 ℃;
(3) silver-colored graphite tape is removed the greasy dirt and the dust on surface with ethanol or acetone;
The ratio of (4) getting alumina silicate, potassium silicate, chrome green, aluminium boride is 8: 1: 2: 12, and water allotment oxidation inhibitor powder, the ratio of water and oxidation inhibitor powder is 1: 4; On the no decorative pattern face of silver-colored graphite flake, add to be coated with and allocate good oxidation inhibitor, oxidation inhibitor thickness is 1mm, and decarburization is 40～80 minutes in crawler type decarburization stove; Preferred decarburization 50 minutes; 600～850 ℃ of decarburization temperature, preferred 650 ℃, practical decarburized depth 0.2mm;
(5) wash the band after the decarburization repeatedly with 100 ℃ hot water, scrub strip surface gently with scrub-brush simultaneously, up to removing the antioxidant protection layer fully;
(6) finish rolling of silver graphite-silver composite strip is thick to 0.65mm, and having compound silver layer face to roll out the identification decorative pattern; Because the decarburization silver layer face of silver graphite-silver composite strip is similar with the silver-colored graphite face outward appearance of not decarburization, therefore the identification decorative pattern is set, can prevent that the silver graphite-silver composite sheet of finished product from obscuring on the two sides when in use.
(7) the silver graphite-silver composite strip is dashed the size that perhaps is cut into regulation;
(8) silver graphite-silver composite electrical contact is handled through cleaning, polish, drying, obtained the silver graphite-silver composite electrical contact material that the graphite fibre direction is parallel to working face.
Embodiment 3, and with reference to Fig. 2, this is another kind of technological process of the present invention, and concrete steps are following.
(1) silver powder and graphite powder is even according to 97: 3 mixed, static pressure such as process, sintering circuit squeeze out the thick silver-colored graphite tape of 2.4mm;
(2) it is thick silver-colored graphite tape repeatedly to be hot-rolled down to 0.8mm, and hot rolling was heated in tubular heater 0.5～10 minute, under rolling equipment auxiliary, carries out, and the hot rolling heating-up temperature is 600 ℃～900 ℃;
(3) silver-colored graphite tape is removed the greasy dirt and the dust on surface with ethanol or acetone;
The ratio of (4) getting alumina silicate, potassium silicate, chrome green, aluminium boride is 10: 1: 3: 10, and with ethanol allotment oxidation inhibitor powder, the ratio of ethanol and oxidation inhibitor powder is 1: 3; On a face of silver-colored graphite tape, add to be coated with and allocate good oxidation inhibitor, oxidation inhibitor thickness is 1mm, and decarburization is 60～120 minutes in crawler type decarburization stove; Preferred decarburization 100 minutes; 600～850 ℃ of decarburization temperature, preferred 700 ℃, practical decarburized depth 0.15mm;
(5) wash the band after the decarburization repeatedly with 100 ℃ hot water, scrub strip surface gently with scrub-brush simultaneously, up to removing oxidation inhibitor fully;
(6) finish rolling of silver graphite-silver composite strip is thick to 0.65mm, and having compound silver layer face to roll out decorative pattern;
(7) the silver graphite-silver composite strip is dashed the size that perhaps is cut into regulation;
(8) silver graphite-silver composite electrical contact is handled through cleaning, polish, drying, obtained the silver graphite-silver composite electrical contact material that the graphite fibre direction is parallel to working face.
Claims (10)
1. the preparation method of a silver graphite-silver composite electrical contact material is characterized in that: include following steps:
(1) silver powder and graphite powder are mixed, be squeezed into the silk material that graphite is fibrous arrangement through oversintering;
(2) be sliced into silver-colored graphite flake with the stretching processing of silk material and with it;
(3) silver-colored graphite flake degreasing, dedusting, polishing, oven dry are handled;
(4) antioxidant coating special is coated in silver-colored graphite flake and simultaneously forms the anti-oxidation protection layer; Put into the oxidizing atmosphere decarburization then, forming one side is the silver layer face, 600-850 ℃ of its decarburization temperature; This antioxidant coating special includes oxidation inhibitor and polar solvent; Described oxidation inhibitor is the mixture of a kind of silicate, chrome green and boride, and said oxidation inhibitor adopts polar solvent that oxidation inhibitor is stirred into starchy antioxidant coating, and described silicate is Al
2O
32SiO
22H
2O and K
2OnSiO
2, described boride is AlB
2, and the ratio of quality and the number of copies of said components is:
Al
2O
32SiO
22H
28～12 parts of O;
K
2OnSiO
20.5～1 part;
Cr
2O
32～3 parts;
AlB
28～10 parts;
Described polar solvent is water or ethanol or acetone, and the mass ratio of oxidation inhibitor total amount and polar solvent is 1: 10～2: 1;
(5) remove the surperficial anti-oxidation protection layer of silver-colored graphite flake, obtain finished product.
2. the preparation method of a kind of silver graphite-silver composite electrical contact material according to claim 1, it is characterized in that: the deflection that the vertical pulling of stretching processing pulls out in the described step (2) is 0.05～0.50mm, drawing speed 0.1～1m/s.
3. the preparation method of a kind of silver graphite-silver composite electrical contact material according to claim 1 and 2; It is characterized in that: also on arbitrary in the silver-colored graphite flake, shut out the identification decorative pattern between described step (2) and the step (3), special-purpose antioxidant coating is coated in silver-colored graphite flake and does not discern on the another side of decorative pattern in the described step (4).
4. the preparation method of a kind of silver graphite-silver composite electrical contact material according to claim 3 is characterized in that: the slice thickness of silk material is 0.3～4mm in the said step (2).
5. the preparation method of a kind of silver graphite-silver composite electrical contact material according to claim 4 is characterized in that: the method for described removal anti-oxidation protection layer is in greater than 60 ℃ hot water, to soak and be stirred to not a half minute.
6. the preparation method of a silver graphite-silver composite electrical contact material is characterized in that:
(1) silver powder and graphite powder are mixed, be squeezed into the band that graphite is fibrous arrangement through oversintering;
(2) with band after hot rolling is repeatedly handled, handle through degreasing, dedusting, polishing, oven dry;
(3) antioxidant coating special is coated in arbitrary of band and forms the anti-oxidation protection layer; Put into the oxidizing atmosphere decarburization then, forming one side is the silver layer face, 600-850 ℃ of its decarburization temperature; This antioxidant coating special includes oxidation inhibitor and polar solvent; Described oxidation inhibitor is the mixture of a kind of silicate, chrome green and boride, and said oxidation inhibitor adopts polar solvent that oxidation inhibitor is stirred into starchy antioxidant coating, and described silicate is Al
2O
32SiO
22H
2O and K
2OnSiO
2, described boride is AlB
2, and the ratio of quality and the number of copies of said components is:
Al
2O
32SiO
22H
28～12 parts of O;
K
2OnSiO
20.5～1 part;
Cr
2O
32～3 parts;
AlB
28～10 parts;
Described polar solvent is water or ethanol or acetone, and the mass ratio of oxidation inhibitor total amount and polar solvent is 1: 10～2: 1;
(4) the anti-oxidation protection layer of removal strip surface;
(5) band is carried out finish rolling and handle, stamping-out becomes the finished product of given size.
7. the preparation method of a kind of silver graphite-silver composite electrical contact material according to claim 6 is characterized in that: to handle be in tube furnace, to heat in the band hot rolling in the described step (2), 600～900 ℃ of heating-up temperatures, 0.5～10 minute heating time.
8. according to the preparation method of claim 6 or 7 described a kind of silver graphite-silver composite electrical contact materials, it is characterized in that: in the said step (5) band is carried out on the silver layer face, rolling out the identification decorative pattern when finish rolling is handled, and then carry out stamping-out.
9. the preparation method of a kind of silver graphite-silver composite electrical contact material according to claim 8 is characterized in that: the method for described removal anti-oxidation protection layer is in greater than 60 ℃ hot water, to soak and be stirred to not a half minute.
10. the preparation antioxidant coating special of a silver graphite-silver composite electrical contact material; It is characterized in that: include oxidation inhibitor and polar solvent; Described oxidation inhibitor is the mixture of a kind of silicate, chrome green and boride; Said oxidation inhibitor adopts polar solvent that oxidation inhibitor is stirred into starchy antioxidant coating, and described silicate is Al
2O
32SiO
22H
2O and K
2OnSiO
2, described boride is AlB
2, and the ratio of quality and the number of copies of said components is:
Al
2O
32SiO
22H
28～12 parts of O;
K
2OnSiO
20.5～1 part;
Cr
2O
32～3 parts;
AlB
28～10 parts;
Described polar solvent is water or ethanol or acetone, and the mass ratio of oxidation inhibitor total amount and polar solvent is 1: 10～2: 1.
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| CN105965022B (en) * | 2015-12-29 | 2018-04-10 | 桂林电器科学研究院有限公司 | A kind of processing method of sheet silver-graphite electrical contact material |
| CN106098443B (en) * | 2016-08-13 | 2019-02-01 | 福达合金材料股份有限公司 | A kind of preparation process of high ratio of brazing area vertical fibers silver graphite electric contact |
| CN108067612B (en) * | 2017-12-15 | 2019-09-06 | 桂林金格电工电子材料科技有限公司 | A kind of preparation process of solderable sheet parallel construction silver graphite contact |
| CN107999747B (en) * | 2017-12-15 | 2019-09-06 | 桂林金格电工电子材料科技有限公司 | A kind of preparation method of the solderable band-like contact material of parallel construction silver graphite |
| 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 |
| CN113284767B (en) * | 2021-04-23 | 2022-05-27 | 浙江福达合金材料科技有限公司 | Preparation method of silver graphite electrical contact with continuous pure silver layer on side surface |
| CN114453584A (en) * | 2021-12-28 | 2022-05-10 | 温州中希电工合金有限公司 | Preparation method of silver graphite electrical contact material |
| CN115483049A (en) * | 2022-09-20 | 2022-12-16 | 苏州西门子电器有限公司 | Preparation method and preparation system of silver graphite contact |
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| JP2001273826A (en) * | 2000-01-17 | 2001-10-05 | Tokuriki Honten Co Ltd | Ag-carbon based contact material and its manufacturing method |
| JP2001202841A (en) * | 2000-01-17 | 2001-07-27 | Tokuriki Honten Co Ltd | Ag-CARBON CONTACT MATERIAL AND METHOD OF MANUFACTURING THE SAME |
| CN1229445C (en) * | 2002-01-29 | 2005-11-30 | 宝山钢铁股份有限公司 | Carbon-contg. refratory material antioxidant coating |
| CN1713463A (en) * | 2004-06-21 | 2005-12-28 | 上海电器科学研究所（集团）有限公司 | Production of fibrous silver-graphite/silver contacts |
| FR2889186B1 (en) * | 2005-08-01 | 2008-01-04 | Messier Bugatti Sa | ANTI-OXIDATION PROCESS OF PARTS IN A COMPOSITE MATERIAL CONTAINING CARBON |
| CN101265372B (en) * | 2008-04-26 | 2010-08-11 | 山西玺汇科技有限公司 | Stainless steel high temperature oxidation resistance paint and application thereof |
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