CN105345012B - A kind of preparation method and application of high conductivity flake silver powder - Google Patents
A kind of preparation method and application of high conductivity flake silver powder Download PDFInfo
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- CN105345012B CN105345012B CN201510675239.3A CN201510675239A CN105345012B CN 105345012 B CN105345012 B CN 105345012B CN 201510675239 A CN201510675239 A CN 201510675239A CN 105345012 B CN105345012 B CN 105345012B
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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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/06—Metallic powder characterised by the shape of the particles
- B22F1/068—Flake-like particles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
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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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling
Abstract
The invention discloses a kind of preparation method and application of high conductivity flake silver powder, comprise the following steps：Spherical or spherical silver powder using high-purity is used as major ingredient；Add graphite powder；Add ball-milling additive；Add ball milling solvent；Above-mentioned raw materials are modulated into slurry presoma, the ball milling of certain time is carried out；Product is washed, dry, crushed, flake silver powder is obtained.It is 1.0~1.9 microns to prepare D50, and D90 is 1.7~4.2 microns, and Dmax is less than or equal to 7 microns, and tap density is 3.4~4.3 grams per milliliters, and specific surface area is the flake silver powder of 0.9~2.6 meters squared per gram.Flake silver powder particle diameter distribution is narrower for this, be easily dispersed, and specific insulation is low, electric conductivity is excellent after electrocondution slurry solidification modulated with it, and adhesive force is good.For the modulation of low temperature curing type conductive silver paste, the fields such as touch screen, FPC, radio frequency identification, thin film switch can be met demand is adapted to silver powder.
Description
Technical field
The present invention relates to a kind of preparation method of noble metal sheet powder body material, particularly a kind of high conductivity flake silver powder
Preparation method and application.
Background technology
Low-temperature cured conductive paste is typically made up of conductive powder, three kinds of main components of organic adhesion agent resin and solvent,
Wherein argent is due to price and the advantage of electric conductivity so that silver-based low-temperature conductive slurry turns into the most class production of application
Product.Conductive silver paste is that super fine silver powder is dispersed in polymer base material, and point, line, the film after solidification have the one of the conductance general character
Material is planted, its conducting function relies primarily on addition specific morphology and sized silver particles provide free electron current-carrying to realize, therefore,
Silver powder turns into the principal element for determining silver paste electric property or even device synthesis application function.Low-temperature solidified silver paste is as crucial former
Material is widely used in the manufacture of a variety of consumer electronics products such as touch screen, FPC, radio frequency identification, thin film switch.
Under the stimulation of application demand, many countries are devoted to the development and exploitation of silver powder, the preparation of silver powder and technology research because
This also has made great progress.
Due to the limitation of low temperature silver paste curing process condition, it is impossible to realize the neck link between Argent grain by sintering processing
Electricity conducting is obtained, it is conductive logical that low temperature silver paste mainly takes the overlapping area after flake silver powder " positioning " and the lap of splice to constitute
Road；The important development direction that flaky powder is inorganic powder material functionalization, become more meticulous.At present, the preparation of flake silver powder
Method has chemical direct-reduction process, evaporation coating stripping method, mechanical attrition method etc..Its superiority of the silver powder of chemical reduction method acquisition
It is that silver powder will not further pollute because of machining, flake silver powder pattern is homogeneous, size uniform, purity high, but due to it
The limitation of yield and preparation method, limits application of the chemical reduction method in large-scale industrial production.Using evaporation coating
Flake silver powder is prepared, the requirement to process equipment is higher, is of limited application.
Current flake silver powder industrialized production mainly uses mechanical attrition method.Mechanical attrition method application characteristic is production
Technical process is easily controllable, flake silver powder lot stability is good, production cost is relatively low, can be applied to mass preparation.Though
Right ball milling dispersion method and technique has a lot, but the flake silver powder that goes out of current grinding has that size distribution ranges are wide, compare table
The problems such as area is small, powdered conductive performance is weak and organic carrier suitability is limited, causes the electronic component quality prepared steady
Qualitative poor, yields is low.
Flake silver powder new preparation technology and new material are developed, is had great importance for flake silver powder performance boost.
The content of the invention
The present invention is directed to low temperature curing type conductive silver paste, it is therefore an objective to provide a kind of the type silver paste high conductivity sheet silver
The preparation method of powder.The core of the present invention is that specific graphite powder is introduced in mechanical milling process, and increases the consumption of spheroid, is improved
Lubricity between ball shape silver powder and spheroid.Mechanical milling process can further destroy graphite powder, make it dispersed in flake
Between flake silver powder, improve dispersiveness of the silver powder in mechanical milling process, effectively in reduction mechanical milling process between generation silver powder
" cold welding ", realizes that flake silver powder particle diameter distribution can be effectively controlled in narrower scope, so as to strengthen the electrical of flake silver powder
Energy.It the method overcome that the powder Size Distribution that traditional mechanical attrition method is present is wider, flaking degree is not enough and jolt ramming
The shortcomings of density is not high, its application shows as silver paste integrated electronic performance and got a promotion.
The present invention improves ball-milling technology simultaneously on the basis of formula adjustment, so as to improve the performance of flake silver powder.With this
The conductive silver paste performance of flake silver powder modulation is stable, and the silver electrode specific insulation after solidification is low, and electric conductivity is excellent, attachment
Power is good, can meet the different silver paste application fields such as touch screen, FPC, radio frequency identification, thin film switch and be adapted to need to silver powder
Ask.
Of the present invention is a kind of preparation method and application of high conductivity flake silver powder：
(1) according to a kind of preparation method and application of high conductivity flake silver powder of the invention, it is characterised in that including following
Step：
Weigh the following each raw material of weight/mass percentage composition：49~49.8% nano-level sphere or spherical super fine silver powder, 0.4
~0.8% specific graphite powder, 0.1~0.4% ball-milling additive, 49.3~50.2% ball milling solvent, being fully ground makes
It is well mixed, and is modulated into slurry presoma.Then the spheroid of 6~10 times of super fine silver powder quality is added, horizontal ball milling is used
Machine carries out ball milling to slurry presoma, afterwards using absolute ethyl alcohol to product cyclic washing, is dried under vacuum after suction filtration,
Finally crushed, just can obtain flake silver powder.
The purity of described spherical or spherical super fine silver powder need to reach 99.95% or more, and particle diameter is 40~200 nanometers.
The particle diameter of the electrically conductive graphite powder is 1.5~180 microns, and carbon content need to reach 99.98% or more.Modified
The particle diameter of conductive expanded graphite powder is 50~120 microns, and carbon content need to reach 99.98% or more.
The ball-milling additive is APES, Ben-zylphenol Polyoxyethyl Ether, phenethyl phenol polyethenoxy ether, the moon
It is cinnamic alcohol APEO, polyacrylic acid, alkyl polyoxyethylene, polyacrylamide, polyvinyl alcohol, fatty acid polyethylene glycol ester, new
Amylalcohol, glycerine, butantriol, sorbierite, methyl anyl alcohol, pentaerythrite, terpinol, triethyl group hexyl phosphoric acid, PMA, N- methyl
One or more in pyrrolidones.
The ball milling solvent is ethylene glycol, propane diols, normal propyl alcohol, isopropanol, n-butanol, isobutanol, butanediol, hexamethylene
One or more in alcohol, ethylene glycol diethyl ether, butyl cellosolve, ethyl acetate, butyl acetate, isoamyl acetate.
The spheroid is the one or more in the zirconia ball of different-diameter, and sphere diameter isMillimeter, ball milling
Rotating speed is 60~180 revs/min, and Ball-milling Time is 10~20 hours.
The absolute ethyl alcohol answers cyclic washing 5~7 times.
The drying temperature dried under the vacuum state is 45 DEG C, and drying time is 8~10 hours.
(2) characterized for the ease of the electrical property of flake silver powder, flake silver powder need to be modulated into conductive silver paste, its feature exists
In comprising the following steps：
Weigh following each raw material of weight/mass percentage composition：The flake silver powder that 65~75% use above method is prepared,
17~20% modified polyurethane organic carrier, 1.5~5% function additive, 4~15% diluent is sufficiently stirred for making it
It is well mixed.Mixed system is disperseed using three-roll grinder afterwards, until slurry fineness is less than or equal to 5 microns
Discharging, finally stirs deaeration, just can obtain a kind of flexible photoelectric device low-temperature cured conductive silver paste under vacuum conditions.
The modified polyurethane number-average molecular weight is between 15000~20000, and organic carrier solid content is in 42%
It is one or more of.
The function additive is BYK-103, BYK-110, BYK-163, BYK-118, BYK-2000, BYK-2001, BYK-
2152nd, the one or more in BYK-300, BYK-333.
The diluent is CBE, high boiling solvent mixed dibasic acid ester (DBE), N,N-dimethylformamide (DMF), second
Diethyl adipate, diethyl malonate, diethyl succinate, ethyl glutarate, diethylene adipate, propylene glycol monobutyl ether,
One or more in methyl amylketone, methyl iso-butyl ketone (MIBK).
The vacuum that deaeration is stirred under the vacuum state is -0.09 MPa, and speed of agitator is 60 revs/min, during deaeration
Between be 30 minutes.
The present invention is compared with known technology, with following obvious advantage：Its innovative point is:
(1) present invention increases the consumption of spheroid, improves spherical silver by introducing specific graphite powder in mechanical milling process
Lubricity between powder and spheroid, enables the particle diameter distribution of flake silver powder to be effectively controlled in narrower scope.Resulting piece
The D50 of shape silver powder be 1.0~1.9 microns, D90 be 1.7~4.2 microns, Dmax be less than or equal to 7 microns, tap density be 3.4~
4.3 grams per milliliters, specific surface area is 0.9~2.6 meters squared per gram.
(2) graphite powder can be dispersed between flake silver powder in mechanical milling process in flake, make the particle diameter of flake silver powder
Distribution can be effectively controlled in narrower scope, so as to enhance the electrical property of flake silver powder.The silver modulated with the flake silver powder
After slurry solidification, the specific insulation of silver electrode reduces 17%~34%, shows that the electric conductivity of the flake silver powder is excellent.
(3) flake silver powder particle size narrowly distributing prepared by the present invention, tap density is high, dispersed in polymer support
Can be good, particularly high silver contains slurry system admittedly, low, silver paste silk-screen printing that slurry viscosity is not added with graphite silver powder compared with equivalent formulation
Figure is smooth, and line-spacing is stable, is particularly suitable for use in the printing of high-resolution fine rule.
(4) particle size distribution range of silver powder is controllable, can meet touch screen, FPC, radio frequency identification, thin film switch etc.
Different silver paste application fields are adapted to demand to silver powder.
Brief description of the drawings
Table 1 is that addition graphite powder refers to being not added with the performance for the silver paste that graphite powder is prepared in the embodiment of the present invention 1~3
Mark.
Fig. 1 is the SEM figures of flake silver powder made from the embodiment of the present invention 1；Mag=10.00K X.
Fig. 2 is the section SEM figures after silver paste solidification made from the embodiment of the present invention 1；Mag=20.00K X.
Fig. 3 is the SEM figures of flake silver powder made from the embodiment of the present invention 2；Mag=5.00K X.
Fig. 4 is the section SEM figures after silver paste solidification made from the embodiment of the present invention 2；Mag=10.00K X.
Fig. 5 is the SEM figures of flake silver powder made from the embodiment of the present invention 3；Mag=10.00K X.
Fig. 6 is the section SEM figures after silver paste solidification made from the embodiment of the present invention 3；Mag=20.00K X.
Embodiment
Embodiment 1：
1st, require：The silver content of spherical or spherical super fine silver powder is 99.95~99.99%, and particle diameter is 40~80 nanometers.
The particle diameter of electrically conductive graphite powder is 130~180 microns, and carbon content is 99.98~99.99%.The diameter of zirconia ball is respectivelyMillimeter andMillimeter.
2nd, weigh 1000 grams of ball shape silver powders, add 8.16 grams of electrically conductive graphite powders, 8.16 grams of terpinol ball-milling additives,
1024.49 grams of isopropanol ball milling solvents, being fully ground is well mixed it.Adding 8000 gram mass ratios is
Zirconia ball, carry out ball milling in horizontal ball mill, rotational speed of ball-mill is 60 revs/min, Ball-milling Time is 20 hours.Use nothing
Water-ethanol is to ball milling product cyclic washing 5 times, and vacuum drying 9 hours, are finally crushed at 45 DEG C.Obtain D50 micro- for 1.0
Rice, D90 is 1.7 microns, and Dmax is less than 4 microns, and tap density is 3.4~4.1 grams per milliliters, and specific surface area is 2.2~2.6 flat
Square rice/gram flake silver powder.
3rd, 200 grams of flake silver powders obtained by the above method are weighed, 55 grams average molecular weights of addition are 17000, admittedly contain
The modified polyurethane organic carrier for 42% is measured, 6 grams of BYK-110 function additives, 46 grams of DBE diluents are sufficiently stirred for mixing it
Close uniform.Mixed system is disperseed using three-roll grinder, can be discharged until slurry fineness is less than or equal to 5 microns.
Planet centrifugal blender vacuum defoamation is finally used, vacuum is -0.09 MPa, and speed of agitator is 60 revs/min, inclined heated plate
For 30 minutes, a kind of flexible photoelectric device low-temperature cured conductive silver paste is obtained.
Embodiment 2：
1st, require：The silver content of spherical or spherical super fine silver powder is 99.95~99.99%, and particle diameter is received for 70~120
Rice.The particle diameter of modified conductive expanded graphite powder is 80~120 microns, and carbon content is 99.98~99.99%.Zirconia ball
It is a diameter ofMillimeter.
2nd, 1000 grams of ball shape silver powders are weighed, 12.14 grams of modified conductive expanded graphite powder, 4.05 grams of polyvinyl alcohol are added
Ball-milling additive, 1008.10 grams of n-butanol ball milling solvents, being fully ground is well mixed it.10000 grams of addition is a diameter ofIn the least
The zirconia ball of rice, carries out ball milling in horizontal ball mill, and rotational speed of ball-mill is 130 revs/min, and Ball-milling Time is 16 hours.Make
With absolute ethyl alcohol to ball milling product cyclic washing 6 times, vacuum drying 8 hours, are finally crushed at 45 DEG C.Obtaining D50 is
1.4 microns, D90 is 3.3 microns, and Dmax is less than or equal to 6 microns, and tap density is 3.4~4.3 grams per milliliters, and specific surface area is
The flake silver powder of 0.9~1.3 meters squared per gram.
3rd, 200 grams of flake silver powders obtained by the above method are weighed, 56 grams average molecular weights of addition are 15000, admittedly contain
The modified polyurethane organic carrier for 42%, 14 grams of BYK-163 function additives are measured, 11 gram mass ratios are ethyl glutarate:Fourth
Diethyl adipate=2:1 diluent, is sufficiently stirred for being well mixed it.Mixed system is divided using three-roll grinder
Dissipate, can be discharged until slurry fineness is less than or equal to 5 microns.Finally use planet centrifugal blender vacuum defoamation, vacuum
For -0.09 MPa, speed of agitator is 60 revs/min, and inclined heated plate is 30 minutes, obtains a kind of flexible photoelectric device low-temperature solid
Change conductive silver paste.
Embodiment 3：
1st, require：The silver content of spherical or spherical super fine silver powder is that 99.95~99.99%, particle diameter is 160~200 to receive
Rice.The particle diameter of electrically conductive graphite powder is 1.5~50 microns, and carbon content is 99.98~99.99%.Modified conductive expanded graphite
The particle diameter of powder is 50~70 microns, and carbon content is 99.98~99.99%.The diameter of zirconia ball is respectivelyMillimeter andMillimeter.
2nd, 1000 grams of ball shape silver powders are weighed, 16.06 gram mass ratios of addition are electrically conductive graphite powder:Modified conductive expansion stone
Ink powder=2:1 mixture, 2.01 grams of polyacrylic acid ball-milling additives, 989.96 grams of ethylene glycol ball milling solvents, being fully ground makes it
It is well mixed.Adding 6000 gram mass ratios isZirconia ball, ball milling, ball are carried out in horizontal ball mill
It is 180 revs/min to grind rotating speed, and Ball-milling Time is 10 hours.Using absolute ethyl alcohol to ball milling product cyclic washing 7 times, at 45 DEG C
Lower vacuum drying 10 hours, is finally crushed.It is 1.9 microns to obtain D50, and D90 is 4.2 microns, and it is micro- that Dmax is less than or equal to 7
Rice, tap density is 3.6~4.2 grams per milliliters, and specific surface area is the flake silver powder of 1.1~1.6 meters squared per grams.
3rd, 200 grams of flake silver powders obtained by the above method are weighed, 46 grams average molecular weights of addition are 20000, admittedly contain
The modified polyurethane organic carrier for 42% is measured, 4 gram mass ratios are BYK-2152:BYK-333=5:3 function additive, 17 grams
Mass ratio is diethylene adipate:Diethyl succinate=2:1 diluent, is sufficiently stirred for being well mixed it.Use three rollers
Grinder is disperseed to mixed system, can be discharged until slurry fineness is less than or equal to 5 microns.Finally centrifuged using planet
Mixer vacuum defoamation, vacuum is -0.09 MPa, and speed of agitator is 60 revs/min, and inclined heated plate is 30 minutes, obtains one
Plant flexible photoelectric device low-temperature cured conductive silver paste.
Electrocondution slurry prepared by above-described embodiment carries out performance test, and specific method of testing is as follows：
(1) electrical performance testing
On PET film piece, by 320 mesh web plates, 1 meter long serpentine three is printed, line width is 0.6mm, 135 DEG C ×
After 40min solidifications, testing conductive line resistor utilizes film thickness gauge FISCHERSCOPE (MMS 3AM) test features thickness, difference
Three conductor resistance rates are calculated, are averaged.
(2) adhesive force is tested
3M610 adhesive tapes are sticked on cured hundred good lattice resolution chart sample areas, by parallel and vertical bar direction
Each viscous one, being exerted oneself with advanced drawing rubber, it is flat to wipe, after placing 1 minute, firmly vertically pulls (10cm/s) adhesive tape rapidly, observes
Whether adhesive tape and sample lines have whether mucilage material and film layer pull.
Graphite powder is added in the embodiment of the present invention 1~3 of table 1 and is not added with the performance indications for the silver paste that graphite powder is prepared
Claims (4)
1. a kind of preparation method of high conductivity flake silver powder, it is characterised in that contain following processing step：
(1) the spherical or spherical silver powder of high-purity is used as major ingredient；
(2) graphite powder is added；
(3) ball-milling additive is added；
(4) ball milling solvent is added；
(5) above-mentioned raw materials are modulated into slurry presoma, the ball milling of certain time is carried out using spheroid；
(6) product is washed, dried, crushed, just can obtain flake silver powder,
Above-mentioned raw materials composition weight/mass percentage composition be：49~49.8% nano-level sphere or spherical super fine silver powder, 0.4~
0.8% graphite powder, 0.1~0.4% ball-milling additive, 49.3~50.2% ball milling solvent, 6~10 times of super fine silver powder quality
Spheroid,
The purity of spherical or spherical super fine silver powder need to be 99.95% or more in step (1), and particle diameter is 40~200 nanometers,
Graphite powder in step (2) is the one or both mixture in electrically conductive graphite powder, modified conductive expanded graphite powder,
The particle diameter of electrically conductive graphite powder is 1.5~180 microns, and carbon content need to reach 99.98% or more, modified conductive expanded graphite
The particle diameter of powder is 50~120 microns, and carbon content need to reach 99.98% or more,
In step (3) ball-milling additive be APES, Ben-zylphenol Polyoxyethyl Ether, phenethyl phenol polyethenoxy ether,
Ethoxylated dodecyl alcohol, polyacrylic acid, alkyl polyoxyethylene, polyacrylamide, polyvinyl alcohol, fatty acid polyethylene glycol ester,
Neopentyl alcohol, glycerine, butantriol, sorbierite, methyl anyl alcohol, pentaerythrite, terpinol, triethyl group hexyl phosphoric acid, PMA, N- first
One or more in base pyrrolidones,
Ball milling solvent is ethylene glycol, propane diols, normal propyl alcohol, isopropanol, n-butanol, isobutanol, butanediol, hexamethylene in step (4)
One or more in alcohol, ethylene glycol diethyl ether, butyl cellosolve, ethyl acetate, butyl acetate, isoamyl acetate,
Spheroid is the one or more in the zirconia ball of different-diameter in step (5), and sphere diameter is 1~15 millimeter of φ, ball
It is 60~180 revs/min to grind rotating speed, and Ball-milling Time is 10~20 hours,
Absolute ethyl alcohol cyclic washing is used in step (6) 5~7 times, step (6) need to be dried under vacuum conditions, and drying temperature is
45 DEG C, drying time is 8~10 hours.
2. a kind of preparation method of high conductivity flake silver powder according to claim 1, it is characterised in that：First by spherical or
Spherical silver powder, graphite powder, ball-milling additive and ball milling solvent, which are fully ground, is well mixed it, is modulated into slurry presoma, it
After add spheroid, spheroid is evenly distributed in slurry presoma and carry out ball milling；The D50 of products therefrom flake silver powder is 1.0
~1.9 microns, D90 is 1.7~4.2 microns, and Dmax is less than or equal to 7 microns, and tap density is 3.4~4.3 grams per milliliters, compares table
Area is 0.9~2.6 meters squared per gram.
3. the application of high conductivity flake silver powder prepared by claim 1, it is characterised in that：For low temperature curing type conductive silver paste
Modulation.
4. the application of high conductivity flake silver powder according to claim 3, it is characterised in that：The low temperature curing type is led
Electric silver paste refers to the silver paste of touch screen, FPC, radio frequency identification or thin film switch.
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| CN107824799A (en) * | 2017-09-19 | 2018-03-23 | 合肥惠科金扬科技有限公司 | A kind of preparation method of TFT LCD displays slurry flake silver powder |
| CN107945912A (en) * | 2017-11-27 | 2018-04-20 | 中国有色桂林矿产地质研究院有限公司 | A kind of high solderability varistor electrode silver plasm and preparation method |
| CN107995712A (en) * | 2017-12-08 | 2018-05-04 | 北京弗圣威尔科技有限公司 | Wireless power heating unit and heating means and placement thing and its preparation method |
| CN112885500B (en) * | 2021-01-14 | 2022-04-19 | 无锡东恒新能源科技有限公司 | Automatic production process of graphene electronic conductive slurry |
| CN112809019B (en) * | 2021-02-07 | 2022-02-22 | 深圳市宏达瑞科技有限公司 | Preparation method of silver powder for low-temperature silver paste of heterojunction solar cell |
| CN114267490A (en) * | 2021-12-22 | 2022-04-01 | 广东南海启明光大科技有限公司 | Homologous nano silver mixture, preparation method and application thereof, and flexible silver paste preparation method |
| CN117600482A (en) * | 2024-01-23 | 2024-02-27 | 长春黄金研究院有限公司 | Preparation method of flake silver powder with high tap density |
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| US6012658A (en) * | 1998-09-22 | 2000-01-11 | Nanopowders Industries Ltd | Method of producing metal flakes, particularly silver flakes of high purity |
| EP1142962A1 (en) * | 2000-04-03 | 2001-10-10 | US Aluminum Inc. | A method for the production of metallic flake pigments |
| CN100391662C (en) * | 2005-09-12 | 2008-06-04 | 昆明理工恒达科技有限公司 | Low loose density sheet-like silver powder preparation method |
| CN102794453B (en) * | 2012-09-03 | 2014-04-09 | 贵研铂业股份有限公司 | Preparation method of ultrathin sheeted silver powder |
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Application publication date: 20160224 Assignee: Kunming Guiyan New Material Technology Co., Ltd. Assignor: Kunming Institute of Precious Metals Contract record no.: X2019530000002 Denomination of invention: Preparation method and application for high-conductivity flake-shaped silver powder Granted publication date: 20171103 License type: Common License Record date: 20190929 |
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