CN107619962A - A kind of preparation method of silver-based electric contact material - Google Patents
A kind of preparation method of silver-based electric contact material Download PDFInfo
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- CN107619962A CN107619962A CN201710775754.8A CN201710775754A CN107619962A CN 107619962 A CN107619962 A CN 107619962A CN 201710775754 A CN201710775754 A CN 201710775754A CN 107619962 A CN107619962 A CN 107619962A
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Abstract
The present invention relates to electricity material preparing technical field, and in particular to a kind of preparation method of silver-based electric contact material.Graphite is refined and produces internal capillary by the present invention, explosion treatment again, form fiber graphite powder, utilize organic carboxyl acid mixed liquid dipping Multi hole blasting graphite fibre, absorption is concentrated again, and utilization has carboxylic acid by Zinc Ions Chelated, then organic carboxyl acid is degraded by the microorganism in biogas slurry, zinc ion is able to again exposed, exposed zinc ion cements out the copper ion in copper-bath, so that in the inside and surface pore of graphite fiber simultaneously supported copper zinc, and there are unlimited compatible properties between copper zinc and silver, therefore the compatibility of the graphite after supported copper zinc and silver matrix is improved, and in the presence of ultrasonic wave and electromagnetic field, graphite is with fiber condition oriented alignment in silver matrix, so that finally obtained contact material anti-wear performance is significantly improved, with splendid wearability, have a extensive future.
Description
Technical field
The present invention relates to electricity material preparing technical field, and in particular to a kind of preparation method of silver-based electric contact material.
Background technology
Contact material is used as the contact materials such as electric switch, instrument and meter, is responsible for connecting with breaking current for task,
Therefore, its performance quality directly affects the reliability service and service life of electric switch and instrument and meter.Electrical contact is being opened and closed
During caused phenomenon it is extremely complex, influence factor is more, preferable contact material must possess good physical property,
Electrical contact performance, processing and manufacturing performance etc..
The characteristics of Ag- C contact materials is that electric conductivity and resistance fusion welding can be good, and contact resistance is low, even in short circuit current
Under also will not melting welding.But arc erosion speed is higher, electrical wear is big, arc extinguishing ability.The contact performance of Ag- C class materials with
Distribution of the graphite particle in silver matrix has much relations.Past manufacture method is powder mixing method, but obtained electricity connects
It is bad to touch material wear-resistant damage property.
With industrialized fast-developing and electronic product update, the research and development to contact material propose
Higher and higher requirement.Therefore a kind of Ag- C contact materials with preferable abrasion resistance properties are invented to prepare electricity material
Technical field has positive meaning.
The content of the invention
Present invention mainly solves technical problem, for current Ag- C contact materials due to silver-based material and carbon filling material it
Between poor compatibility, a kind of the defects of causing contact material abrasion resistance properties difference, there is provided preparation of silver-based electric contact material
Method.
In order to solve the above-mentioned technical problem, the technical solution adopted in the present invention is：
A kind of preparation method of silver-based electric contact material, it is characterised in that specifically preparation process is：
（1）Graphite grinding is weighed, obtains refining graphite, ultrasonic disperse is handled after refinement graphite and water are mixed, ultrasonic disperse knot
Filtered after beam, isolated filter residue, freeze 3~5min of filter residue with liquid nitrogen spraying immediately, freezing is dried after terminating, pre-processed
Graphite；
（2）Above-mentioned pretreating graphite is subjected to explosion treatment, discharging, obtains Multi hole blasting graphite fibre；
（3）Caused accessory substance winestone in grape wine brewing process is collected, then takes Fresh Lemon section, squeeze the juice, is separated by filtration
Except filter residue, filtrate is obtained, is fitted into after winestone and filtrate are mixed in fermentation tank, then acetic acid bacterium powder is added into fermentation tank, stirring
It is sealed by fermentation after uniformly, takes out tunning centrifugal treating, is separated except precipitation, obtain upper liquid；
（4）Will Multi hole blasting graphite fibre and above-mentioned upper liquid mix after be standing and soak for 10~12h, then by the mixture after immersion
Baking oven is moved into after being concentrated under reduced pressure, dries, obtains modified porous explosion graphite fibre；
（5）Biogas slurry and copper-bath are mixed to get mixed liquor, above-mentioned modified porous explosion graphite fibre zinc nitrate is molten
Liquid is taken out after soaking 2~3h, then is soaked 3~5 days with mixed liquor is secondary, and immersion is filtered after terminating, isolated filter residue, after drying
Produce self-made fill；
（6）Count in parts by weight, weigh 90~92 parts of silver powder and 8~10 parts of above-mentioned self-made fills and 1~2 part of 500 mesh is solitary
Stone powder, is fitted into after well mixed in mould, the directional transmissions ultrasonic wave first around mould, under ultrasonication mixing 1~
2h, supersound process applies an externally-applied magnetic field again towards the equidirectional of ultrasound emission again after terminating, after continuing with 1~2h
Mould is moved into high temperature sintering furnace, discharged after heat preservation sintering, is stripped, produces silver-based electric contact material.
Step（1）Described in refinement graphite and water mass ratio be 1:5, the frequency of ultrasonic disperse processing for 30~
40kHz, the time of ultrasonic disperse processing is 10~15h.
Step（2）Described in the method for explosion treatment be：Pretreating graphite is fitted into cavity charge containers, made by force (forcing) pump
It is pressurized in cavity charge containers, until explosion pressure inside the tank reaches 0.9~1.0MPa, pressurize handles 2~3min, opens the exhaust of cavity charge containers
Valve, explosion pressure inside the tank moment is reduced to normal pressure, discharge, obtain Multi hole blasting graphite fibre.
Step（3）Described in winestone and filtrate mass ratio be 1:5, the addition of acetic acid bacterium powder is filtrate quality
1%, the temperature of sealing and fermenting is 38~40 DEG C, and the time of sealing and fermenting is 3~5 days, the rotating speed of centrifugal treating for 3000~
4000r/min, the time of centrifugal treating is 10~15min.
Step（4）Described in Multi hole blasting graphite fibre and upper liquid mass ratio be 1:5.
Step（5）Described in biogas slurry and copper-bath mass ratio be 1:5, the mass fraction of copper-bath is
30%, the mass fraction of zinc nitrate solution is 35%.
Step（6）Described in the ultrasonic frequency of transmitting be 30~40kHz, the magnetic induction intensity of the externally-applied magnetic field of application
It is 1 × 10 for 2500~2800Gauss, magnetic force6 Gauss2/ cm, the temperature of heat preservation sintering is 1000~1100 DEG C, heat preservation sintering
Time be 1~2h.
The beneficial effects of the invention are as follows：
（1）Graphite is refined and produces internal capillary by the present invention by the ice effect of splitting first, increases graphite interior porosity, then lead to
Explosion treatment is crossed, is pressurizeing and is producing pressure differential inside graphite during moment release of pressure so that graphite is internally formed from inside to outside
The high pressure draught of impact, in the presence of the high pressure draught, the weak fragmented parts of graphite are destroyed, and form fiber graphite
Powder, acidification is carried out to winestone in the presence of microorganism using the organic carboxyl acid in lemon juice, forms another organic carboxylic
Acid-tartaric acid, a variety of organic carboxyl acid mixed liquors are finally obtained, soak Multi hole blasting graphite fibre with it, then concentrate absorption so that
Organic carboxyl acid is adsorbed inside graphite fibre and in the hole on surface, and using there is the sequestering by Zinc Ions Chelated of carboxylic acid,
Then organic carboxyl acid is degraded by the microorganism in biogas slurry, zinc ion is able to again exposed, exposed zinc ion by copper sulphate
Copper ion in solution cements out, so that supported copper zinc simultaneously in the inside and surface pore of graphite fiber, and copper
There are unlimited compatible properties between zinc and silver, therefore graphite after supported copper zinc and the compatibility of silver matrix are improved, and
In the presence of ultrasonic wave and electromagnetic field, graphite is with fiber condition oriented alignment in silver matrix so that final that electrical contact is made
Material wear-resistant performance is significantly improved.
（2）The present invention also with the addition of rare earth ore powder into silver matrix, and under the high temperature conditions, rare earth element is formed molten
The higher oxide of point and compound, are dispersed in silver-colored liquation, improve the viscosity of silver-colored liquation, can effectively prevent silver-based electric contact
Material produces splashing in the presence of electric arc, reduces the loss of contact material, improves the energy of material resistance arc erosion
The alloy that power, silver and rare earth element are formed decomposes in the presence of arc heat, consumed energy, it is suppressed that and the temperature rise of material is too high,
Protection materials are corroded by electric arc, the abrasion resistance properties of silver-based electric contact material is further increased dramatically, and are had wide
Application prospect. .
Embodiment
Weigh graphite and be put into 20~30min of grinding in mortar, obtain refining graphite, be in mass ratio by refinement graphite and water
1:Filtered after 5 mixing with ultrasonic disperse instrument with 30~40kHz frequency ultrasound 10~15h of decentralized processing, ultrasonic disperse after terminating,
Isolated filter residue, 3~5min of filter residue is freezed with liquid nitrogen spraying immediately, freezing is dried after terminating, and obtains pretreating graphite；Will be pre-
Processing graphite is fitted into cavity charge containers, makes to be pressurized in cavity charge containers by force (forcing) pump, up to explosion pressure inside the tank reaches 0.9~
1.0MPa, pressurize handle 2~3min, open the air bleeding valve of cavity charge containers, explosion pressure inside the tank moment is reduced to normal pressure, discharge,
Obtain Multi hole blasting graphite fibre；Caused accessory substance winestone in grape wine brewing process is collected, then takes Fresh Lemon section, squeeze
Juice, removal filter residue is separated by filtration, obtains filtrate, be 1 in mass ratio by winestone and filtrate:It is fitted into after 5 mixing in fermentation tank, then to
The acetic acid bacterium powder of filtrate quality 1% is added in fermentation tank, is sealed by fermentation 3~5 days at 38~40 DEG C after stirring, takes out hair
Ferment product centrifuge is separated except precipitation with 3000~4000r/min rotating speed 10~15min of centrifugal treating, is obtained upper liquid；
It is 1 in mass ratio by Multi hole blasting graphite fibre and upper liquid:10~12h is standing and soak for after 5 mixing, then by the mixing after immersion
Thing is fitted into concentration tank, reduces pressure inside the tank to 600~700Pa, moves into baking oven after being concentrated under reduced pressure, dried at 105~110 DEG C
To constant weight, modified porous explosion graphite fibre is obtained；It is 1 in mass ratio:Biogas slurry and mass fraction are 30% copper-bath by 5
Mixed liquor is mixed to get, is taken after modified porous explosion graphite fibre is soaked into 2~3h with the zinc nitrate solution that mass fraction is 35%
Go out, then soaked 3~5 days with mixed liquor is secondary, immersion is filtered after terminating, isolated filter residue, and self-made fill is produced after drying；Press
Parts by weight meter, 90~92 parts of silver powder and 8~10 parts of self-made fills and 1~2 part of 500 solitary stone powder of mesh are weighed, be well mixed
It is fitted into afterwards in mould, the ultrasonic wave first around mould with ultrasonic generator directional transmissions frequency for 30~40kHz, in ultrasound
Effect 1~2h of lower mixing, supersound process apply one again with magnetic field generator towards the equidirectional of ultrasound emission again after terminating
Individual magnetic induction intensity is 2500~2800Gauss, magnetic force is 1 × 106 Gauss2/ cm externally-applied magnetic field, after continuing with 1~2h
Mould is moved into high temperature sintering furnace, 1000~1100 DEG C is heated to, is discharged after 1~2h of heat preservation sintering, is stripped, produces silver
Base electrical contact material.
Example 1
Weigh graphite and be put into mortar and grind 20min, obtain refining graphite, be 1 in mass ratio by refinement graphite and water:5 mixing
Filtered, isolated filter residue, stood after terminating with 30kHz frequency ultrasound decentralized processing 10h, ultrasonic disperse with ultrasonic disperse instrument afterwards
Filter residue 3min is freezed with liquid nitrogen spraying, freezing is dried after terminating, and obtains pretreating graphite；Pretreating graphite is loaded into cavity charge containers
In, make to be pressurized in cavity charge containers by force (forcing) pump, until explosion pressure inside the tank reaches 0.9MPa, pressurize processing 2min, open explosion
The air bleeding valve of tank, explosion pressure inside the tank moment is reduced to normal pressure, discharge, obtain Multi hole blasting graphite fibre；Collect grape wine
Caused accessory substance winestone in brewing process, then take Fresh Lemon section, squeeze the juice, removal filter residue is separated by filtration, obtains filtrate, will
Winestone and filtrate are 1 in mass ratio:It is fitted into after 5 mixing in fermentation tank, then the acetic acid bacteria of filtrate quality 1% is added into fermentation tank
Powder, it is sealed by fermentation 3 days at 38 DEG C after stirring, takes out tunning centrifuge with 3000r/min rotating speed centrifugal treatings
10min, separate except precipitation, obtain upper liquid；It is 1 in mass ratio by Multi hole blasting graphite fibre and upper liquid:It is quiet after 5 mixing
Immersion 10h is put, then the mixture after immersion is fitted into concentration tank, pressure inside the tank is reduced to 600Pa, moves into and dry after being concentrated under reduced pressure
Case, dried at 105 DEG C to constant weight, obtain modified porous explosion graphite fibre；It is 1 in mass ratio:5 by biogas slurry and mass fraction
Mixed liquor is mixed to get for 30% copper-bath, modified porous explosion graphite fibre mass fraction is molten for 35% zinc nitrate
Take out after liquid immersion 2h, then soaked 3 days with mixed liquor is secondary, immersion is filtered after terminating, isolated filter residue, is derived from after drying
Filler processed；Count in parts by weight, weigh 90 parts of silver powder and 8 parts of self-made fills and 1 part of 500 solitary stone powder of mesh, after being well mixed
It is fitted into mould, the ultrasonic wave for being 30kHz with ultrasonic generator directional transmissions frequency first around mould, under ultrasonication
1h is mixed, it is strong that supersound process applies a magnetic induction again with magnetic field generator towards the equidirectional of ultrasound emission again after terminating
It is 1 × 10 to spend for 2500Gauss, magnetic force6 Gauss2/ cm externally-applied magnetic field, continue with and mould is moved into high temperature sintering after 1h
In stove, 1000 DEG C are heated to, is discharged after heat preservation sintering 1h, be stripped, produce silver-based electric contact material.
Example 2
Weigh graphite and be put into mortar and grind 25min, obtain refining graphite, be 1 in mass ratio by refinement graphite and water:5 mixing
Filtered, isolated filter residue, stood after terminating with 35kHz frequency ultrasound decentralized processing 13h, ultrasonic disperse with ultrasonic disperse instrument afterwards
Filter residue 4min is freezed with liquid nitrogen spraying, freezing is dried after terminating, and obtains pretreating graphite；Pretreating graphite is loaded into cavity charge containers
In, make to be pressurized in cavity charge containers by force (forcing) pump, until explosion pressure inside the tank reaches 0.9MPa, pressurize processing 2min, open explosion
The air bleeding valve of tank, explosion pressure inside the tank moment is reduced to normal pressure, discharge, obtain Multi hole blasting graphite fibre；Collect grape wine
Caused accessory substance winestone in brewing process, then take Fresh Lemon section, squeeze the juice, removal filter residue is separated by filtration, obtains filtrate, will
Winestone and filtrate are 1 in mass ratio:It is fitted into after 5 mixing in fermentation tank, then the acetic acid bacteria of filtrate quality 1% is added into fermentation tank
Powder, it is sealed by fermentation 4 days at 39 DEG C after stirring, takes out tunning centrifuge with 3500r/min rotating speed centrifugal treatings
13min, separate except precipitation, obtain upper liquid；It is 1 in mass ratio by Multi hole blasting graphite fibre and upper liquid:It is quiet after 5 mixing
Immersion 11h is put, then the mixture after immersion is fitted into concentration tank, pressure inside the tank is reduced to 650Pa, moves into and dry after being concentrated under reduced pressure
Case, dried at 108 DEG C to constant weight, obtain modified porous explosion graphite fibre；It is 1 in mass ratio:5 by biogas slurry and mass fraction
Mixed liquor is mixed to get for 30% copper-bath, modified porous explosion graphite fibre mass fraction is molten for 35% zinc nitrate
Take out after liquid immersion 3h, then soaked 4 days with mixed liquor is secondary, immersion is filtered after terminating, isolated filter residue, is derived from after drying
Filler processed；Count in parts by weight, weigh 91 parts of silver powder and 9 parts of self-made fills and 2 part of 500 solitary stone powder of mesh, after being well mixed
It is fitted into mould, the ultrasonic wave for being 35kHz with ultrasonic generator directional transmissions frequency first around mould, under ultrasonication
2h is mixed, it is strong that supersound process applies a magnetic induction again with magnetic field generator towards the equidirectional of ultrasound emission again after terminating
It is 1 × 10 to spend for 2650Gauss, magnetic force6 Gauss2/ cm externally-applied magnetic field, continue with and mould is moved into high temperature sintering after 2h
In stove, 1050 DEG C are heated to, is discharged after heat preservation sintering 2h, be stripped, produce silver-based electric contact material.
Example 3
Weigh graphite and be put into mortar and grind 30min, obtain refining graphite, be 1 in mass ratio by refinement graphite and water:5 mixing
Filtered, isolated filter residue, stood after terminating with 40kHz frequency ultrasound decentralized processing 15h, ultrasonic disperse with ultrasonic disperse instrument afterwards
Filter residue 5min is freezed with liquid nitrogen spraying, freezing is dried after terminating, and obtains pretreating graphite；Pretreating graphite is loaded into cavity charge containers
In, make to be pressurized in cavity charge containers by force (forcing) pump, until explosion pressure inside the tank reaches 1.0MPa, pressurize processing 3min, open explosion
The air bleeding valve of tank, explosion pressure inside the tank moment is reduced to normal pressure, discharge, obtain Multi hole blasting graphite fibre；Collect grape wine
Caused accessory substance winestone in brewing process, then take Fresh Lemon section, squeeze the juice, removal filter residue is separated by filtration, obtains filtrate, will
Winestone and filtrate are 1 in mass ratio:It is fitted into after 5 mixing in fermentation tank, then the acetic acid bacteria of filtrate quality 1% is added into fermentation tank
Powder, it is sealed by fermentation 5 days at 40 DEG C after stirring, takes out tunning centrifuge with 4000r/min rotating speed centrifugal treatings
15min, separate except precipitation, obtain upper liquid；It is 1 in mass ratio by Multi hole blasting graphite fibre and upper liquid:It is quiet after 5 mixing
Immersion 12h is put, then the mixture after immersion is fitted into concentration tank, pressure inside the tank is reduced to 700Pa, moves into and dry after being concentrated under reduced pressure
Case, dried at 110 DEG C to constant weight, obtain modified porous explosion graphite fibre；It is 1 in mass ratio:5 by biogas slurry and mass fraction
Mixed liquor is mixed to get for 30% copper-bath, modified porous explosion graphite fibre mass fraction is molten for 35% zinc nitrate
Take out after liquid immersion 3h, then soaked 5 days with mixed liquor is secondary, immersion is filtered after terminating, isolated filter residue, is derived from after drying
Filler processed；Count in parts by weight, weigh 92 parts of silver powder and 10 parts of self-made fills and 2 part of 500 solitary stone powder of mesh, after being well mixed
It is fitted into mould, the ultrasonic wave for being 40kHz with ultrasonic generator directional transmissions frequency first around mould, under ultrasonication
2h is mixed, it is strong that supersound process applies a magnetic induction again with magnetic field generator towards the equidirectional of ultrasound emission again after terminating
It is 1 × 10 to spend for 2800Gauss, magnetic force6 Gauss2/ cm externally-applied magnetic field, continue with and mould is moved into high temperature sintering after 2h
In stove, 1100 DEG C are heated to, is discharged after heat preservation sintering 2h, be stripped, produce silver-based electric contact material.
Reference examples
Reference examples are used as using the silver-based electric contact material of company of Yunnan Province production
Friction and wear behavior survey is carried out to the silver-based electric contact material in silver-based electric contact material produced by the present invention and reference examples
Examination；
Method of testing：Carried out using friction and wear tester, frictional wear experiment is carried out in atmospheric conditions, acts on composite wood
Pressure on material is 10N, and 30r/min is maintained to the rotating speed of bull ring.By the electric current of contact material by DF173OSL60A types
D.C. regulated power supply supplies, and D.C. regulated power supply current regulation scope is 0-60A, voltage regulation limits 0-30V, every 12h
It is as shown in table 1 with the wear extent of electronics balance measurement contact material, testing result：
Table 1
| Detection project | Example 1 | Example 2 | Example 3 | Reference examples |
| 12h wear extenies（g） | 0.003 | 0.004 | 0.003 | 0.007 |
| 24h wear extenies（g） | 0.005 | 0.005 | 0.004 | 0.010 |
| 36h wear extenies（g） | 0.008 | 0.006 | 0.006 | 0.025 |
There are splendid abrasion resistance properties by detecting silver-based electric contact material produced by the present invention it can be seen from data in upper table,
Have a extensive future.
Claims (7)
1. a kind of preparation method of silver-based electric contact material, it is characterised in that specifically preparation process is：
（1）Graphite grinding is weighed, obtains refining graphite, ultrasonic disperse is handled after refinement graphite and water are mixed, ultrasonic disperse knot
Filtered after beam, isolated filter residue, freeze 3~5min of filter residue with liquid nitrogen spraying immediately, freezing is dried after terminating, pre-processed
Graphite；
（2）Above-mentioned pretreating graphite is subjected to explosion treatment, discharging, obtains Multi hole blasting graphite fibre；
（3）Caused accessory substance winestone in grape wine brewing process is collected, then takes Fresh Lemon section, squeeze the juice, is separated by filtration
Except filter residue, filtrate is obtained, is fitted into after winestone and filtrate are mixed in fermentation tank, then acetic acid bacterium powder is added into fermentation tank, stirring
It is sealed by fermentation after uniformly, takes out tunning centrifugal treating, is separated except precipitation, obtain upper liquid；
（4）Will Multi hole blasting graphite fibre and above-mentioned upper liquid mix after be standing and soak for 10~12h, then by the mixture after immersion
Baking oven is moved into after being concentrated under reduced pressure, dries, obtains modified porous explosion graphite fibre；
（5）Biogas slurry and copper-bath are mixed to get mixed liquor, above-mentioned modified porous explosion graphite fibre zinc nitrate is molten
Liquid is taken out after soaking 2~3h, then is soaked 3~5 days with mixed liquor is secondary, and immersion is filtered after terminating, isolated filter residue, after drying
Produce self-made fill；
（6）Count in parts by weight, weigh 90~92 parts of silver powder and 8~10 parts of above-mentioned self-made fills and 1~2 part of 500 mesh is solitary
Stone powder, is fitted into after well mixed in mould, the directional transmissions ultrasonic wave first around mould, under ultrasonication mixing 1~
2h, supersound process applies an externally-applied magnetic field again towards the equidirectional of ultrasound emission again after terminating, after continuing with 1~2h
Mould is moved into high temperature sintering furnace, discharged after heat preservation sintering, is stripped, produces silver-based electric contact material.
A kind of 2. preparation method of silver-based electric contact material according to claim 1, it is characterised in that：Step（1）Middle institute
The refinement graphite and the mass ratio of water stated are 1:5, the frequency of ultrasonic disperse processing be 30~40kHz, ultrasonic disperse handle when
Between be 10~15h.
A kind of 3. preparation method of silver-based electric contact material according to claim 1, it is characterised in that：Step（2）Middle institute
The method for the explosion treatment stated is：Pretreating graphite is fitted into cavity charge containers, makes to be pressurized in cavity charge containers by force (forcing) pump, until quick-fried
Broken pressure inside the tank reaches 0.9~1.0MPa, and pressurize handles 2~3min, opens the air bleeding valve of cavity charge containers, make explosion pressure inside the tank wink
Between be reduced to normal pressure, discharge, obtain Multi hole blasting graphite fibre.
A kind of 4. preparation method of silver-based electric contact material according to claim 1, it is characterised in that：Step（3）Middle institute
The winestone and the mass ratio of filtrate stated are 1:5, the addition of acetic acid bacterium powder is the 1% of filtrate quality, and the temperature of sealing and fermenting is 38
~40 DEG C, time of sealing and fermenting is 3~5 days, and the rotating speed of centrifugal treating is 3000~4000r/min, the time of centrifugal treating
For 10~15min.
A kind of 5. preparation method of silver-based electric contact material according to claim 1, it is characterised in that：Step（4）Middle institute
The Multi hole blasting graphite fibre and the mass ratio of upper liquid stated are 1:5.
A kind of 6. preparation method of silver-based electric contact material according to claim 1, it is characterised in that：Step（5）Middle institute
The biogas slurry and the mass ratio of copper-bath stated are 1:5, the mass fraction of copper-bath is 30%, the quality of zinc nitrate solution
Fraction is 35%.
A kind of 7. preparation method of silver-based electric contact material according to claim 1, it is characterised in that：Step（6）Middle institute
The ultrasonic frequency for the transmitting stated is 30~40kHz, the magnetic induction intensity of the externally-applied magnetic field of application is 2500~2800Gauss,
Magnetic force is 1 × 106 Gauss2/ cm, the temperature of heat preservation sintering is 1000~1100 DEG C, and the time of heat preservation sintering is 1~2h.
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| CN112030081A (en) * | 2020-09-03 | 2020-12-04 | 谢晓佳 | Electric contact material and preparation method thereof |
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Effective date of registration: 20180423 Address after: 213000 zhangzhate 23, new gate village, new gate town, Zhong Lou District, Changzhou, Jiangsu Applicant after: Zhao Shunquan Address before: 213102 No. 13, No. 600 Tongjiang Middle Road, Xinbei District, Changzhou, Jiangsu 311 Applicant before: Changzhou double Chemical Co., Ltd. |
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