CN107999747A - A kind of preparation method of high solderability parallel construction silver graphite banding contact material - Google Patents

A kind of preparation method of high solderability parallel construction silver graphite banding contact material Download PDF

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Publication number
CN107999747A
CN107999747A CN201711360193.1A CN201711360193A CN107999747A CN 107999747 A CN107999747 A CN 107999747A CN 201711360193 A CN201711360193 A CN 201711360193A CN 107999747 A CN107999747 A CN 107999747A
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silver
graphite
decarburization
colored
billet
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CN107999747B (en
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蒋德志
谭光讯
黄锡文
罗春华
金红
唐更生
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Guilin Jinge Electrotechnical Electronic Material Science & Technology Co Ltd
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Guilin Jinge Electrotechnical Electronic Material Science & Technology Co Ltd
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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
    • 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
    • B22F3/02—Compacting only
    • B22F3/04—Compacting only by applying fluid pressure, e.g. by cold isostatic pressing [CIP]
    • 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
    • B22F3/10—Sintering only
    • B22F3/1003—Use of special medium during sintering, e.g. sintering aid
    • B22F3/1007—Atmosphere
    • 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
    • B22F3/10—Sintering only
    • B22F3/1017—Multiple heating or additional steps
    • 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
    • B22F3/24—After-treatment of workpieces or articles
    • 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
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Contacts (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Switches (AREA)

Abstract

The invention discloses a kind of preparation method of high solderability parallel construction silver graphite banding contact material.This method comprises the following steps successively：1) dosage of the graphite powder according to needed for calculating the material mixture ratio of required silver-graphite electrical contact to be prepared and silver powder, carries out mixed powder, obtains mixed powder after weighing；2) gained mixed powder isostatic pressing, obtains silver-colored graphite billet；3) the silver-colored graphite billet of gained carries out decarburization, obtains the silver-colored graphite billet after decarburization；4) the silver-colored graphite billet after gained decarburization sinters under the conditions of protective atmosphere, the silver-colored graphite billet after being sintered；5) the silver-colored graphite billet after gained sintering carries out conventional extrusion, room temperature rolling, conventional finish rolling, to obtain the final product.The method of the invention is simple, and production cost is low, can effectively improve the processing performance and welding performance of contact material.

Description

A kind of preparation method of high solderability parallel construction silver graphite banding contact material
Technical field
The present invention relates to silver-colored graphite contact material, and in particular to a kind of high solderability parallel construction silver graphite banding contact material The preparation method of material.
Background technology
The preparation process of existing silver graphite (AgC) contact is broadly divided into two major classes：One kind is powder monolithic pressing process, separately One kind is extrusion process, wherein：
Monolithic pressing process is that silver-colored powdered graphite is fitted into progress pressure compacting in mold cavity, is processed into blade contact, Again through sintering, again press, post-process etc. process be processed into finished product blade contact；Wherein contact welding silver layer (Ag) can pass through pressure pressure Technique processed realizes compressing (being processed into AgC/Ag contacts in pressure pressing stage) of silver-colored graphite linings and silver layer, can also pass through Follow-up monolithic decarbonization process, obtains welding silver layer.Because being limited to appointed condition and processing technology, the sets of contacts of this method processing Knit that loose, density is low, welding silver layer hole is more, it is necessary to adding solder could weld, and welding quality and unstable.
The silver-colored graphite material of extrusion process processing, since by hot extrusion, material structure is finer and close, and graphite particle is in fiber Shape is distributed, and material performs better than in terms of electrical property, therefore obtains extensive use.The silver-colored graphite material of extrusion process processing, root According to graphite fibre and work relation of plane, it is divided into vertical stratification silver graphite contact (i.e. graphite fibre vertical operation face surface) with putting down Row structure silver graphite contact (i.e. graphite fibre multiple operation face surface).Two kinds of contacts compare, vertical stratification silver graphite contact Anti-scorching it is good, and parallel construction silver graphite contact resistance fusion welding is preferable, and therefore, two kinds of contacts respectively have advantage and disadvantage, is applicable in not Same demand.But since parallel construction silver graphite contact is in terms of welding silver layer prepares processing and in terms of mass production techniques There are bigger difficulty, so the silver-colored graphite contact of extrusion process processing, occupies master by the silver-colored graphite contact of vertical stratification for a long time Flow status.
The conventional flowsheet of vertical stratification silver graphite contact is：
--- extruding --- section --- decarburization --- multiple pressure --- cutting --- post processing prepared by spindle.
The welding silver layer of vertical stratification silver graphite contact is the similar monolithic presser by the way that after extruding, monolithic decarburization obtains The product of skill obtains silver layer using decarbonization process, but except that during decarburization, often by the way of full wafer product decarburization, That is six surface all decarburizations, so to obtain working face, it is also necessary to dispose the decarburization silver layer on one surface of product, even if such as This, in the surrounding of working face, still there are certain thickness decarburization silver layer；On the other hand, in order to distinguish welding silver layer face and Working face, also needs to the step of increase product is embossed in technological process, so the technological process length of vertical stratification silver graphite products, Relatively cumbersome, cost is higher.Further, since silver layer is loose after the characteristics of decarburization silver layer is intrinsic, i.e. decarburization, hole is more, add Welding difficulty, stability of the welding quality are poor.
And the technique for preparing parallel construction silver graphite contact mainly has two kinds, difference is as follows：
(1) strip decarburization preparation process
It is prepared by spindle that --- extruding --- rolls --- strip decarburization --- working face processing --- punch process slabbing Billot is processed into contact or sub-cut.
(2) spindle Compound Extrusion
It is prepared by spindle that --- silver layer preparation --- extrudes --- working face processing --- rolling --- punch process slabbing Billot is processed into contact or sub-cut.
The patent of invention of Publication No. CN101866761A, discloses a kind of system of silver graphite-silver composite electrical contact material The preparation method of Preparation Method and its antioxidant coating special, wherein silver graphite-silver composite electrical contact material is：By silver powder and stone Ink powder mixes, and is squeezed into the silk material or band that graphite is in fibrous arrangement through oversintering, silver-colored graphite silk is cut into certain thickness Piece, silver-colored graphite tape, to certain thickness, then roll decorative pattern, through over cleaning by multiple hot rolling in the one side of silver-colored graphite flake The one side without patterned surface and band of silver-colored graphite flake afterwards coats antioxidant, is put into decarbonizing furnace and heats decarburization, then removes Antioxidant, band is by finish rolling backlash or is cut into regulatory specifications, and finally obtaining one side has the silver graphite-silver of fine silver composite bed Composite electric contact material.The invention production cost is low, and processing efficiency is higher, and compound silver layer is uniform, and composite bed bond strength is opposite Higher, working face protection is relatively good, is adapted to produce in enormous quantities；But due to needing to smear and remove antioxidant, production stream Journey is still longer；Need control good the uniformity of coating, otherwise easily cause working face decarburization；Since decarburized layer is without excessive change Shape is processed, and is still suffered from compared with concrete dynamic modulus, and existing on welding influences.
The patent of invention of Publication No. CN1713463A, discloses a kind of processing for manufacturing the silver-colored graphite/silver contact of threadiness Method》It is related to a kind of processing method for manufacturing the silver-colored graphite/silver contact of threadiness, this method comprises the following steps：Silver, graphite are mixed Close powder to align through sintering-being crushed to graphite, in fibrous silver-colored graphite section bar, by carbonization treatment, in its appearance Face forms silver layer, then carries out protectiveness corrosion, and it is working face (no silver layer) to become one side, and another side is welding surface (silver layer) Silver-colored graphite/silver contact, it is characterised in that add following steps：1) cold rolling or warm-rolling-annealing is repeated, is rolled to certain Thickness；2) band is heated and kept the temperature in air or oxygen-enriched atmosphere, aoxidized the graphite on its surface；3) certain one side of band Stick protective layer；4) salpeter solution is immersed；5) protective layer is peelled off, is rolled and is annealed again, band is rolled to specific thickness； 6) striped consistent with graphite fibre direction is shut out in silver layer face；7) band is rushed or is tailored into given size.This method manufactures Contact welding surface silver layer is uniform, welding performance is good, working face noresidue silver layer, has good technique and performance. It is but easily cracking in rolling in the actual production process, since the plasticity of silver-colored graphite products is low；And nitric acid dousing removes During decarburized layer, operating environment to production operator there are adverse effect, while the relatively more unmanageable thickness removed, it is difficult to ensure that Working lining is remained without decarburized layer, and adds the loss of material, cost；Decarburized layer is equally without big distortion, to rear There is influence in continuous welding.
The patent of invention of Publication No. CN101693955A, discloses a kind of method for preparing silver-graphite electrical contact belt, tool Body includes silver-colored graphite spindle preparation, prepared by the silver-colored graphite tape of multiple silver, silver-colored strip-rolling, multiple silver-colored band answer solder, multiple silver-colored multiple weldering again The silver-colored graphite tape type of material rolls, polishes, deoiling, dry be surface-treated and etc. obtained silver-graphite electrical contact belt finished product.Should Invention is uniform, stable, controllable with multiple silver thickness, and uniform, stable, solderable characteristic of good performance of solder layer etc. is excellent Point, but need to prepare the silver layer with silver-colored graphite spindle no-float, and in actual mechanical process, it tends to be difficult to accomplish to coordinate Well, the bond strength of silver-colored graphite and silver layer is influenced to a certain extent；On the other hand, the invention is to improve weldability, into Multiple solder of having gone is processed, and is both added technological process, is also improved production cost.
The patent of invention of Publication No. CN105551859A, discloses a kind of preparation side of sheet silver-graphite electrical contact material Method, is specially：Required graphite powder and carbonic acid silver powder are calculated according to the material mixture ratio of required silver-graphite electrical contact to be prepared, Weigh spare；Carbonic acid silver powder and graphite powder are subjected to mixed powder, obtained silver carbonate graphite mixed powder is through being molded, roasting, sintering And decarbonization process, obtain the silver-colored graphite billet of parcel silver layer on the outside of spindle；Further be processed into band through hot extrusion, after pass through Rolling, punch process, obtain sheet silver-graphite electrical contact.The invention the method can effectively reduce brittlement phase graphite and Argent grain Directly contact, make that the mechanical and physical character of obtained product and processing performance are more excellent, and metallographic structure is more uniformly distributed.The skill Refer to that silver-colored graphite spindle carries out the technique that decarburization obtains silver layer in art scheme, the silver layer which is obtained, during due to by decarburization The influence of temperature, atmosphere, there are the non-uniform problem of decarburization in actual production process, so as to influence the performance of contact and follow-up Welding；On the other hand, to improve the compactness of material, the extruding of use is bigger, limits the scope of final products size, touches Head thickness tend not to it is too thin, can not be too thick, therefore the technique of the invention still has certain limitation, influences The batch production of product and the weldability of contact.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of high solderability parallel construction silver graphite banding contact material Preparation method, this method is simple, and production cost is low, can effectively improve the processing performance of contact material, while can effectively improve institute Obtain the welding performance of contact material.
The preparation method of high solderability parallel construction silver graphite banding contact material of the present invention, successively including following Step：
1) dosage of the graphite powder according to needed for calculating the material mixture ratio of required silver-graphite electrical contact to be prepared and silver powder, Mixed powder is carried out after weighing, obtains mixed powder；
2) gained mixed powder isostatic pressing, obtains silver-colored graphite billet；
3) the silver-colored graphite billet of gained carries out decarburization, obtains the silver-colored graphite billet after decarburization；
4) the silver-colored graphite billet after gained decarburization sinters under the conditions of protective atmosphere, the silver-colored graphite billet after being sintered；
5) the silver-colored graphite billet after gained sintering carries out conventional extrusion, room temperature rolling, conventional finish rolling, obtains parallel construction silver Graphite banding contact material.
In the step 1) of above-mentioned preparation method, the granularity selection of graphite powder and silver powder is same as the prior art, it is preferable that choosing With the silver powder that particle mean size is 10~50 μm, the graphite powder that particle mean size is 3~8 μm is selected.The silver powder and graphite powder mix Powder operation is same as the prior art, can specifically carry out in a mixer, preferably under conditions of rotating speed is 20~40r/min Stir 1~4h.
In the step 2) of above-mentioned preparation method, isostatic pressing operation is identical with existing routine operation, specifically, isostatic pressed Molding briquetting pressure is usually 100~150MPa.
In the step 3) of above-mentioned preparation method, silver-colored graphite billet typically carries out decarburization in atmosphere.In order to preferably control Atmosphere uniformity in decarbonation appliance processed, so as to improve the uniformity and uniformity of decarburized layer, preferably silver-colored graphite billet is compressing Decarburization is carried out in air or oxygen, it is 5~10L/min to control throughput.In the step, decarburization is preferably in 650~800 DEG C of bars Carried out under part, the time is 2~6h；Wherein decarburization time can carry out conventional adjustment according to final product thickness and silver thickness.
In the step 4) of above-mentioned preparation method, sintering operation is identical with existing routine operation, preferably at 800~900 DEG C Under the conditions of sinter 3~6h.
In the step 5) of above-mentioned preparation method, the extruding, finish rolling operation are identical with existing routine operation, specifically Ground, extrusion temperature are 750~850 DEG C.Due to improvement of the foregoing each processing step to material property so that can be in room temperature during rolling Under the conditions of carry out, and roll when deformation measure effectively lifting, be every time rolling reduction≤30%, improve material add Work performance, and production efficiency is improved, reduce production cost.
In follow-up welding process it is resistance by the parallel construction silver graphite banding contact material that the above method is prepared Welding process, when welding, need not add solder.
Compared with prior art, the method have the characteristics that：
1st, method is simple, process simplification.Whole technical process is broadly divided into five big steps, billet preparation, decarburization, sintering, Extruding, rolling, technical process substantially simplify, and in major step, due to no special operating process, would not also be related to The input of special installation, requires no particularity to working condition, can more realize the batch production of product.
2nd, use the direct decarburization of billet to obtain on the outside of spindle as the decarburization ingot (the silver-colored graphite billet after decarburization) of silver layer, that is, subtract Lack billet sintering flow, while also solved the parcel of silver layer and spindle, matching problem, improve final contact silver graphite linings Bond strength with welding silver layer；Using the silver-colored graphite billet decarbonization process obtained by isostatic pressing, strip decarburization it also avoid Poor in processability, decarburized layer are difficult to control before caused strip decarburization, not caused enough the weldability of decarburized layer compactness is bad, material The problems such as big and chemical treatments are lost in material silver.
3rd, the sintering circuit after decarburization ingot is effectively improved the compactness of decarburized layer and the compactness of spindle entirety, Play an important role to the processing performance and weldability for improving material, also so that processing thickness is more than 1.5mm or is less than The contact product of 0.7mm is possibly realized.
4th, extrusion process is to prepare one of satisfactory critical process of silver-colored graphite strip for having welding silver layer, the mistake The flow feature of material when journey takes full advantage of extruding, so as to obtain strip of the one side for silver-colored graphite working lining；And by foregoing After sintering densification, which can also be reduced extrusion ratio, obtained thickness and be more than more than 1.5mm and material property satisfaction It is required that strip, so as to extend product size scope.
5th, due to improvement of the These steps to material property, in the operation of rolling, it is possible to achieve room temperature rolls and finish rolling, The banding contact material for meeting welding needs is prepared, so as to effectively reduce technique difficulty of processing, improves production efficiency, Production cost is reduced, it can be achieved that producing in enormous quantities.
6th, due to improvement of the abovementioned steps to material compactness, it is possible to achieve when contact welds, it is not necessary in addition increase weldering The bed of material or addition solder, i.e. contact silver layer are directly welded with tactile bridge, realize the high solderability of contact, and ratio of brazing area reaches 95% More than, production cost is reduced, improves the welding quality of product.
Brief description of the drawings
Fig. 1 is the outside drawing of parallel construction silver graphite banding contact material made from the embodiment of the present invention 1；
Fig. 2 is the metallograph (100 of the section of parallel construction silver graphite banding contact material made from the embodiment of the present invention 1 ×)；
Fig. 3 is that parallel construction silver graphite banding contact material made from the embodiment of the present invention 1 carries out open resistance welding Metallograph (50 ×) afterwards；
Fig. 4 is the metallograph (100 ×) of silver-graphite electrical contact belt made from comparative example 1 of the present invention；
Fig. 5 is that the sheet silver graphite that silver-graphite electrical contact belt made from comparative example 1 of the present invention is obtained through conventional punch touches Head carries out the metallograph (100 ×) after open resistance welding.
Embodiment
With reference to specific embodiment, the present invention is described in further detail, to more fully understand present disclosure, but The present invention is not limited to following embodiments.
Embodiment 1
1) according to 10kg AgC (3) material mixture ratio calculating silver powder and the dosage needed for graphite powder is prepared, 9.7kg silver powder is weighed With 0.3kg silver graphite powders, using mixed powder is carried out on bipyramid blender, rotating speed 25r/min, time 2h, obtains mixed powder；
2) gained mixed powder, which is placed on equal pressing equipment, is molded, and briquetting pressure 100MPa, obtains silver-colored graphite billet；
3) the silver-colored graphite billet of gained is placed in decarbonizing furnace, and compressed air, throughput 5L/min, heating are passed through to decarbonizing furnace To 650 DEG C, decarburization 6h is kept the temperature, obtains the silver-colored graphite billet after decarburization；
4) the silver-colored graphite billet after gained decarburization is placed in sintering furnace, is sintered under the conditions of hydrogen shield, sintering temperature Spend for 800 DEG C, time 5h, the silver-colored graphite billet after being sintered；
5) by the silver-colored graphite billet after sintering, routinely extrusion process is squeezed into strip, and extrusion temperature is 700 DEG C, extrusion ratio For 100；
6) gained strip will be extruded at normal temperatures, it is thick to be rolling to required semi-finished product by every time rolling reduction 25% Degree, obtains semi-finished product strip；
7) gained semi-finished product strip is subjected to finish rolling, obtains the parallel construction silver graphite banding that finished product thickness is 0.55mm and touch Head material, its appearance are as shown in Figure 1.
Comparative example 1
1) according to 10kg AgC (3) material mixture ratio calculating silver powder and the dosage needed for graphite powder is prepared, 9.7kg silver powder is weighed With 0.3kg silver graphite powders, using mixed powder is carried out on bipyramid blender, rotating speed 25r/min, time 2h, obtains mixed powder；
2) gained mixed powder, which is placed on equal pressing equipment, is molded, and briquetting pressure 150MPa, obtains silver-colored graphite billet；
3) the silver-colored graphite billet of gained is placed in sintering furnace, is sintered under the conditions of hydrogen shield, sintering temperature 920 DEG C, time 4h, the silver-colored graphite billet after being sintered；
4) the silver-colored graphite billet after gained decarburization is placed in decarbonizing furnace, and the decarburization in air atmosphere, is warming up to 650 DEG C, protects Warm decarburization 6h, obtains the silver-colored graphite billet after decarburization；
5) by the silver-colored graphite billet after decarburization, routinely extrusion process is squeezed into strip, and extrusion temperature is 880 DEG C, extrusion ratio For 200；
6) extruding gained strip is carried out repeatedly rolling (every time rolling reduction 15%), is annealed to required size (0.7mm), obtains finished product strip；
7) by gained finished product strip, routinely technique strikes out blade contact.
Embodiment 2
Embodiment 1 is repeated, unlike：
In step 2), isostatic pressing pressure is 150MPa；
In step 3), the throughput that compressed air is passed through to decarbonizing furnace is 9L/min, and decarburization temperature is 700 DEG C, and the time is 2h；
In step 4), sintering temperature is 900 DEG C, time 3h；
In step 5), extrusion temperature is 800 DEG C, extrusion ratio 80.
Embodiment 3
Embodiment 1 is repeated, unlike：
In step 2), isostatic pressing pressure is 130MPa；
In step 3), the throughput that compressed air is passed through to decarbonizing furnace is 8L/min, and decarburization temperature is 750 DEG C, and the time is 3h；
In step 4), sintering temperature is 850 DEG C, time 4h；
In step 5), extrusion temperature is 750 DEG C, extrusion ratio 200.
Contact material made from above-described embodiment 1 and comparative example 1 is subjected to metallographic structure analysis, respectively such as the institutes of Fig. 2 and 4 Show.
Contact material made from above-described embodiment 1 and comparative example 1 is carried out without progress metallographic structure point after material resistance welding Analysis, respectively as shown in Figures 3 and 5.
From Fig. 2-5, the silver-graphite electrical contact belt metallographic structure prepared by the method for the invention is uniform, decarburized layer Consistency of thickness is preferable, and welding quality is preferable；And contact weld layer prepared by existing conventional spindle sintering process (i.e. comparative example 1) Consistency of thickness is poor, influences welding quality, while contact binder course intensity is relatively low.
Silver-colored graphite banding contact material made from above-described embodiment 1-2 and comparative example 1 is subjected to correlated performance detection, as a result As described in Table 1：
Table 1：

Claims (5)

  1. A kind of 1. preparation method of high solderability parallel construction silver graphite banding contact material, it is characterised in that：Successively include with Lower step：
    1) dosage of the graphite powder according to needed for calculating the material mixture ratio of required silver-graphite electrical contact to be prepared and silver powder, weighs After carry out mixed powder, obtain mixed powder；
    2) gained mixed powder isostatic pressing, obtains silver-colored graphite billet；
    3) the silver-colored graphite billet of gained carries out decarburization, obtains the silver-colored graphite billet after decarburization；
    4) the silver-colored graphite billet after gained decarburization sinters under the conditions of protective atmosphere, the silver-colored graphite billet after being sintered；
    5) the silver-colored graphite billet after gained sintering carries out conventional extrusion, room temperature rolling, conventional finish rolling, obtains parallel construction silver graphite Banding contact material.
  2. 2. preparation method according to claim 1, it is characterised in that：In step 3), the silver graphite billet is empty in compression Decarburization is carried out in gas or oxygen, flow is 5~10L/min.
  3. 3. preparation method according to claim 1 or 2, it is characterised in that：In step 3), decarburization is in 650~800 DEG C of conditions Lower progress, time are 2~6h.
  4. 4. preparation method according to claim 1 or 2, it is characterised in that：In step 4), sinter in 800~900 DEG C of conditions Lower progress.
  5. 5. preparation method according to claim 4, it is characterised in that：The time of sintering is 3~6h.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN114833711A (en) * 2022-05-25 2022-08-02 四川华丰科技股份有限公司 Post-treatment process for silver-carbon composite coating

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