CN107999747B - A kind of preparation method of the solderable band-like contact material of parallel construction silver graphite - Google Patents
A kind of preparation method of the solderable band-like contact material of parallel construction silver graphite Download PDFInfo
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- CN107999747B CN107999747B CN201711360193.1A CN201711360193A CN107999747B CN 107999747 B CN107999747 B CN 107999747B CN 201711360193 A CN201711360193 A CN 201711360193A CN 107999747 B CN107999747 B CN 107999747B
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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]
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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
- B22F3/10—Sintering only
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
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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
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional steps
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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
- B22F3/24—After-treatment of workpieces or articles
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- 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
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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
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Abstract
The invention discloses a kind of preparation methods of the band-like contact material of high solderability parallel construction silver graphite.This method is successively the following steps are included: the dosage of graphite powder and silver powder needed for 1) being calculated according to the material mixture ratio of required silver-graphite electrical contact to be prepared, carries out mixed powder, obtain 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, the silver-colored graphite billet after obtaining decarburization；4) the silver-colored graphite billet after gained decarburization is sintered under the conditions of protective atmosphere, obtains sintered silver-colored graphite billet；5) the sintered silver-colored graphite billet of gained carry out conventional extrusion, room temperature rolling, conventional finish rolling to get.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
Technical field
The present invention relates to silver-colored graphite contact materials, and in particular to a kind of band-like contact material of high solderability parallel construction silver graphite
The preparation method of material.
Background technique
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, in which:
Monolithic pressing process is that silver-colored powdered graphite is fitted into progress pressure compacting in mold cavity, is processed into blade contact,
It is sintered again, the processes such as pressure, post-processing are processed into finished product blade contact again；Wherein contact welding silver layer (Ag) can pass through pressure pressure
Technique processed realizes the compression moulding (being processed into AgC/Ag contact in pressure pressing stage) of silver-colored graphite linings and silver layer, can also pass through
Subsequent 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, and needing to add solder could weld, and welding quality and unstable.
The silver-colored graphite material of extrusion process processing, due to passing through hot extrusion, material structure is finer and close, and graphite particle is in fiber
Shape distribution, material performs better than in terms of electrical property, therefore is widely applied.The silver-colored graphite material of extrusion process processing, root
According to graphite fibre and work relation of plane, it is divided into vertical structure silver graphite contact (i.e. graphite fibre vertical operation face surface) and flat
Row structure silver graphite contact (i.e. graphite fibre multiple operation face surface).Two kinds of contacts compare, vertical structure 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 structure for a long time
Flow status.
The conventional flowsheet of vertical structure silver graphite contact are as follows:
Spindle preparation --- squeezes --- slice --- decarburization --- multiple pressure --- cutting --- post-processing.
The welding silver layer of vertical structure silver graphite contact is the similar monolithic presser by the way that after extruding, monolithic decarburization is obtained
The product of skill obtains silver layer using decarbonization process, but except that when 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
Still there is certain thickness decarburization silver layer in the surrounding of working face in this；On the other hand, in order to distinguish welding silver layer face and
Working face, the step of also needing to increase product embossing in process flow, so the process flow of vertical structure silver graphite products it is long,
It is relatively cumbersome, higher cost.Further, since the feature that decarburization silver layer is intrinsic, i.e., after decarburization, silver layer is loose, hole is more, increases
Welding difficulty, stability of the welding quality are poor.
And prepare there are mainly two types of the techniques of parallel construction silver graphite contact, it is as follows respectively:
(1) strip decarburization preparation process
Spindle preparation --- squeezes --- rolling --- strip decarburization --- working face processing --- punch process slabbing
Billot is processed into contact or sub-cut.
(2) spindle Compound Extrusion
--- silver layer preparation --- squeezes --- working face processing --- rolling --- punch process slabbing for spindle preparation
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
Preparation Method and its antioxidant coating special, wherein silver graphite-silver composite electrical contact material the preparation method comprises the following steps: by silver powder and stone
Ink powder mixing 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 upper decorative pattern in silver-colored graphite flake, through over cleaning by multiple hot rolling on one side
Silver-colored graphite flake afterwards coats antioxidant without patterned surface and band on one side, is put into decarbonizing furnace and heats decarburization, then removes
Antioxidant, band is by finish rolling backlash or is cut into regulatory specifications, finally obtains the silver graphite-silver for having fine silver composite layer on one side
Composite electric contact material.The invention production cost is low, and processing efficiency is higher, and compound silver layer is uniform, and composite layer bond strength is opposite
Higher, working face protection is relatively good, is suitble to produce in enormous quantities；But due to needing to smear and remove antioxidant, production stream
Journey is still longer；It needs control good the uniformity of coating, otherwise easily causes working face decarburization；Since decarburized layer is without excessive change
Shape processing, still suffer from it is more porous, on welding exist influence.
The patent of invention of Publication No. CN1713463A discloses a kind of processing of silver-colored graphite/silver contact of manufacture threadiness
Method " it is related to a kind of processing method of silver-colored graphite/silver contact of manufacture threadiness, this method includes the following steps: to mix in silver, graphite
Conjunction powder is sintered-is crushed to graphite and aligned, in the silver-colored graphite profile of threadiness, by carbonization treatment, in its appearance
Face forms silver layer, then carries out protectiveness corrosion, and becoming one side is working face (no silver layer), and another side is welding surface (silver layer)
Silver-colored graphite/silver contact, it is characterised in that increase following steps: 1) cold rolling or warm-rolling-annealing is repeated, is rolled to certain
Thickness；2) band is heated and is kept the temperature in air or oxygen-enriched atmosphere, be oxidized the graphite on its surface；3) certain one side of band
Stick protective layer；4) nitric acid solution is immersed；5) protective layer is peelled off, is rolled and is annealed again, band is rolled to specific thickness；
6) it is shut out and the consistent striped in graphite fibre direction in silver layer face；7) band is rushed or is tailored into predetermined size.This method manufacture
Contact welding surface silver layer is uniform, welding performance is good, working face noresidue silver layer, there is good technique and service performance.
But in the actual production process, since the plasticity of silver-colored graphite products is low, easily crack in rolling；And nitric acid dousing removes
When decarburized layer, there are adverse effects to production operator for operating environment, while being relatively difficult to control the thickness of removal, it is difficult to ensure that
Working lining is remained without decarburized layer, and increases 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, the silver-colored graphite tape preparation of silver, multiple silver strip-rolling, multiple silver-colored band answer solder, the weldering again of multiple silver again
Expect silver-colored graphite tape type roll, polish, deoiling, dry be surface-treated and etc. obtained silver-graphite electrical contact belt finished product.It should
Invention have multiple silver thickness uniformly, stablize, be controllable, solder layer uniformly, stablize, can weld characteristic of good performance etc. it is excellent
Point, but need to prepare the silver layer with silver-colored graphite spindle no-float, and in the actual operation process, it tends to be difficult to accomplish to cooperate
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 increased process flow, 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, specifically: graphite powder and carbonic acid silver powder needed for being calculated according to the material mixture ratio of required silver-graphite electrical contact to be prepared,
It weighs spare；Carbonic acid silver powder and graphite powder are subjected to mixed powder, obtained silver carbonate graphite mixed powder is through molding, roasting, sintering
And decarbonization process, obtain the silver-colored graphite billet of package 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
Direct contact, keep the mechanical and physical character of product obtained and processing performance more excellent, metallographic structure is more uniform.The skill
Refer to that silver-colored graphite spindle carries out the technique that decarburization obtains silver layer, technique silver layer obtained, when due to by decarburization in art scheme
The influence of temperature, atmosphere, there are the non-uniform problems of decarburization in actual production process, to influence the performance of contact and subsequent
Welding；It on the other hand, is the compactness for improving material, the extruding of use is bigger, limits the range 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.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of band-like contact materials of high solderability parallel construction silver graphite
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 the band-like contact material of high solderability parallel construction silver graphite of the present invention successively includes following
Step:
1) dosage of graphite powder and silver powder needed for being calculated according to the material mixture ratio of required silver-graphite electrical contact to be prepared,
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, the silver-colored graphite billet after obtaining decarburization；
4) the silver-colored graphite billet after gained decarburization is sintered under the conditions of protective atmosphere, obtains sintered silver-colored graphite billet；
5) the sintered silver-colored graphite billet of gained carries out conventional extrusion, room temperature rolling, conventional finish rolling, obtains parallel construction silver
The band-like contact material of graphite.
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
The silver powder for being 10~50 μm with average particle size, selecting average particle size is 3~8 μm of graphite powder.The silver powder and graphite powder it is mixed
Powder operation is same as the prior art, can specifically carry out in a mixer, preferably under conditions of revolving speed is 20~40r/min
Stir 1~4h.
In the step 2) of above-mentioned preparation method, isostatic pressing operation is identical as existing routine operation, specifically, waits static pressure
Molding briquetting pressure is usually 100~150MPa.
In the step 3) of above-mentioned preparation method, silver-colored graphite billet usually carries out decarburization in air.In order to preferably control
Atmosphere consistency in decarbonation appliance processed, so as to improve the uniformity and consistency of decarburized layer, preferably silver-colored graphite billet is compressing
Decarburization is carried out in air or oxygen, control throughput is 5~10L/min.In the step, decarburization is preferably in 650~800 DEG C of items
It is carried out under part, the time is 2~6h；Wherein decarburization time can carry out general adjustment according to final product thickness and silver thickness.
In the step 4) of above-mentioned preparation method, sintering operation is identical as existing routine operation, preferably at 800~900 DEG C
Under the conditions of be sintered 3~6h.
In the step 5) of above-mentioned preparation method, the extruding, finish rolling operation are identical as existing routine operation, specifically
Ground, squeezing temperature is 750~850 DEG C.Improvement due to aforementioned each processing step to material property, so that can be in room temperature when rolling
Under the conditions of carry out, and deformation measures effectively promotion when rolling, for rolling reduction≤30% per pass, improve material plus
Work performance, and production efficiency is improved, reduce production cost.
The band-like contact material of parallel construction silver graphite prepared by the above method is resistance in subsequent welding process
Welding process, when welding, do not need addition solder.
Compared with prior art, present invention is characterized in that
1, method is simple, process simplification.Entire technical process is broadly divided into five big steps, billet preparation, decarburization, sintering,
It squeezing, rolling, technical process obviously simplifies, and in major step, due to not special operating process, would not also be related to
The investment of special installation requires no particularity to working condition, is more able to achieve the batch production of product.
2, it uses 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, subtracts
Lack billet sintering process, while also having solved the package of silver layer and spindle, matching problem, improves final contact silver graphite linings
With the bond strength of welding silver layer；Using the resulting silver-colored graphite billet decarbonization process of isostatic pressing, strip decarburization is also avoided
Poor in processability, decarburized layer are not easy to control before brought 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.
3, the sintering process after decarburization ingot effectively improves the compactness of decarburized layer and the compactness of spindle entirety,
It plays an important role to the processing performance and weldability that improve material, but also processing thickness is greater than 1.5mm or is less than
The contact product of 0.7mm is possibly realized.
4, extrusion process is to prepare one of the critical process of the satisfactory silver-colored graphite strip for having welding silver layer, the mistake
The flow feature of material when journey takes full advantage of extruding, to obtain one side as the strip of silver-colored graphite working lining；And by aforementioned
After sintering densification, which can also be reduced extrusion ratio, obtained thickness and be greater than 1.5mm or more and material property satisfaction
It is required that strip, to extend product size range.
5, room temperature rolling and finish rolling may be implemented during the rolling process in the improvement due to These steps to material property,
It prepares the band-like contact material for meeting and welding and needing and improves production efficiency to effectively reduce technique difficulty of processing,
Production cost is reduced, it can be achieved that producing in enormous quantities.
6, the improvement due to abovementioned steps to material compactness when contact welding may be implemented, does not need in addition to increase weldering
The bed of material or addition solder, the i.e. direct welding of contact silver layer and touching bridge, realize the high solderability of contact, and ratio of brazing area reaches 95%
More than, production cost is reduced, the welding quality of product is improved.
Detailed description of the invention
Fig. 1 is the outside drawing of the band-like contact material of parallel construction silver graphite made from the embodiment of the present invention 1；
Fig. 2 is the metallographic microscope (100 of the section of the band-like contact material of parallel construction silver graphite made from the embodiment of the present invention 1
×)；
Fig. 3 is that the band-like contact material of parallel construction silver graphite made from the embodiment of the present invention 1 carries out open resistance welding
Metallographic microscope (50 ×) afterwards；
Fig. 4 is the metallographic microscope (100 ×) of silver-graphite electrical contact belt made from comparative example 1 of the present invention；
Fig. 5 is the sheet silver graphite touching that silver-graphite electrical contact belt made from comparative example 1 of the present invention is obtained through conventional punch
Head carries out the metallographic microscope (100 ×) after open resistance welding.
Specific embodiment
The present invention is described in further detail combined with specific embodiments below, content to better understand the invention, but
The present invention is not limited to following embodiments.
Embodiment 1
1) according to dosage needed for 10kg AgC (3) material mixture ratio calculates silver powder and graphite powder is prepared, 9.7kg silver powder is weighed
With 0.3kg silver graphite powder, using mixed powder is carried out on bipyramid blender, revolving speed 25r/min, time 2h obtain mixed powder；
2) gained mixed powder, which is placed on equal pressing equipment, forms, and briquetting pressure 100MPa obtains silver-colored graphite billet；
3) the silver-colored graphite billet of gained is placed in decarbonizing furnace, is passed through compressed air, throughput 5L/min, heating to decarbonizing furnace
To 650 DEG C, decarburization 6h, the silver-colored graphite billet after obtaining decarburization are kept the temperature；
4) the silver-colored graphite billet after gained decarburization is placed in sintering furnace, is sintered under the conditions of hydrogen shield, sintering temperature
Degree is 800 DEG C, time 5h, obtains sintered silver-colored graphite billet；
5) by sintered silver-colored graphite billet, routinely extrusion process is squeezed into strip, and squeezing temperature is 700 DEG C, extrusion ratio
It is 100；
6) gained strip will be squeezed at normal temperature, semi-finished product required for being rolling to by rolling reduction per pass 25% are thick
Degree, obtains semi-finished product strip；
7) gained semi-finished product strip is subjected to finish rolling, obtains the band-like touching of parallel construction silver graphite that finished product thickness is 0.55mm
Head material, appearance are as shown in Figure 1.
Comparative example 1
1) according to dosage needed for 10kg AgC (3) material mixture ratio calculates silver powder and graphite powder is prepared, 9.7kg silver powder is weighed
With 0.3kg silver graphite powder, using mixed powder is carried out on bipyramid blender, revolving speed 25r/min, time 2h obtain mixed powder；
2) gained mixed powder, which is placed on equal pressing equipment, forms, 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 obtains sintered silver-colored graphite billet；
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, is protected
Warm decarburization 6h, the silver-colored graphite billet after obtaining decarburization；
5) by the silver-colored graphite billet after decarburization, routinely extrusion process is squeezed into strip, and squeezing temperature is 880 DEG C, extrusion ratio
It is 200；
6) gained strip will be squeezed repeatedly to be rolled (rolling reduction 15% per pass), be 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 150MPa；
In step 3), the throughput for being passed through compressed air 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), squeezing temperature is 800 DEG C, extrusion ratio 80.
Embodiment 3
Embodiment 1 is repeated, unlike:
In step 2), isostatic pressing pressure 130MPa；
In step 3), the throughput for being passed through compressed air 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), squeezing 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 institute 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, it is as shown in Figures 3 and 5 respectively.
It is by Fig. 2-5 it is found that uniform by the silver-graphite electrical contact belt metallographic structure of the method for the invention preparation, decarburized layer
Consistency of thickness is preferable, and welding quality is preferable；And contact welding 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 lower.
The band-like contact material of silver graphite made from above-described embodiment 1-2 and comparative example 1 is subjected to correlated performance detection, as a result
It is as described in Table 1:
Table 1:
Claims (5)
1. a kind of preparation method of the solderable band-like contact material of parallel construction silver graphite, it is characterised in that: successively according to the following steps
It carries out:
1) dosage of graphite powder and silver powder needed for being calculated according to the material mixture ratio of required silver-graphite electrical contact to be prepared, 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, the silver-colored graphite billet after obtaining decarburization；
4) the silver-colored graphite billet after gained decarburization is sintered under the conditions of protective atmosphere, obtains sintered silver-colored graphite billet；
5) the sintered silver-colored graphite billet of gained carries out conventional extrusion, room temperature rolling, conventional finish rolling, obtains parallel construction silver graphite
Band-like contact material.
2. the preparation method of the solderable band-like contact material of parallel construction silver graphite according to claim 1, it is characterised in that:
In step 3), the silver graphite billet carries out decarburization in compressed air or oxygen, and flow is 5~10L/min.
3. the preparation method of the solderable band-like contact material of parallel construction silver graphite according to claim 1 or 2, feature exist
In: in step 3), decarburization carries out under the conditions of 650~800 DEG C, and the time is 2~6h.
4. the preparation method of the solderable band-like contact material of parallel construction silver graphite according to claim 1 or 2, feature exist
In: in step 4), sintering carries out under the conditions of 800~900 DEG C.
5. the preparation method of the solderable band-like contact material of parallel construction silver graphite according to claim 4, it is characterised in that:
The time of sintering is 3~6h.
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| 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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