WO2018066722A1 - Procédé de fabrication de poudre d'argent de type paillettes à l'aide de poudre d'argent agglomérée - Google Patents

Procédé de fabrication de poudre d'argent de type paillettes à l'aide de poudre d'argent agglomérée Download PDF

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Publication number
WO2018066722A1
WO2018066722A1 PCT/KR2016/011090 KR2016011090W WO2018066722A1 WO 2018066722 A1 WO2018066722 A1 WO 2018066722A1 KR 2016011090 W KR2016011090 W KR 2016011090W WO 2018066722 A1 WO2018066722 A1 WO 2018066722A1
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powder
silver powder
flake
silver
agglomerated
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PCT/KR2016/011090
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English (en)
Korean (ko)
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이미영
최재원
강태훈
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엘에스니꼬동제련 주식회사
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Priority to PCT/KR2016/011090 priority Critical patent/WO2018066722A1/fr
Publication of WO2018066722A1 publication Critical patent/WO2018066722A1/fr

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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
    • 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
    • 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
    • B22F9/16—Making metallic powder or suspensions thereof using chemical processes
    • B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
    • B22F9/24—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
    • 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

Definitions

  • the present invention relates to a method for producing a flake silver powder for conductive paste used in electronic parts such as electrode materials.
  • well-dispersed silver powder of uniform size in the metal powder may be utilized as an important material for various electronic industries such as conductive inks, pastes, and adhesives.
  • Low-temperature curable conductive paste is required to exhibit the required conductivity at a low drying temperature of 250 degrees or less, and as a conductive filler, flake silver powder having a larger contact area between particles than spherical is mainly used.
  • Electrodes patterns As the electrode patterns become finer, such as touch screen panels (TSPs), flexible printed circuit boards (FPCBs), RFID antennas, and metal meshes for transparent electrodes, silver powder used in conductive pastes is also used. A fine powder having a small particle size is required.
  • the manufacture of flake silver powder consists of the synthesis process of silver powder (called raw powder) used as raw material and the processing process of processing raw powder into flake shape through mechanical milling using beads.
  • raw powder silver powder
  • micron-sized spherical silver powder was used as the powder.
  • the powder when a small mechanical force is applied to reduce the particle size increase, the powder is fine in size, but the partially flaked spherical silver powder has a problem of decreasing the conductivity of the electrode due to the small contact area between the powder particles.
  • the present inventors intend to disclose a method for producing flake silver powder using agglomerated powder, not spherical powder.
  • the present invention is to solve the above problems by using agglomerated powder rather than spherical powder as the raw material of the flake silver powder, it is possible to manufacture at a low manufacturing cost using a universal milling equipment and beads (1mm ⁇ 5mm) In addition, the particle size is easy to control, and the contact area between the particles has a high conductivity to provide a fine flake silver powder manufacturing method.
  • the present invention provides a method for producing flake silver powder, comprising a flaked step (S2) of obtaining a flake powder by milling through beads using agglomerated silver powder as a raw powder, wherein the agglomerated silver powder has a primary particle size
  • the silver particle which is 0.1-0.8 micrometer aggregates, and it provides the manufacturing method of the flake silver powder which is a powder whose average particle diameter is 2.0-10.0 micrometer, and whose specific surface area is 1.0-2.5 m ⁇ 2> / g.
  • the flaked powder is separated from the beads, washed, dried and pulverized to obtain a flake silver powder (S4); further comprising a mean particle size (D50) of 0.5 to 3.0 ⁇ m and a specific surface area of 1.0 to Provided is a method for producing flake silver powder, which obtains flake silver powder of 3.0 m 2 / g and a tap density of 2.5 to 4.5 g / cc.
  • the flakes step (S2) is a slurry of the aggregated silver powder, flake silver powder manufacturing, characterized in that the step of milling at 300 to 700rpm speed for 3 to 6 hours using beads of 1 to 5mm Provide a method.
  • the flakes step (S2) Previously, preparing a flake silver powder further comprising; raw material powder manufacturing step (S1) of preparing a coagulated silver powder by adding a reducing solution containing a reducing agent to a silver source solution containing silver (Ag) at an input rate.
  • raw material powder manufacturing step (S1) of preparing a coagulated silver powder by adding a reducing solution containing a reducing agent to a silver source solution containing silver (Ag) at an input rate.
  • the raw material powder manufacturing step (S1) is to produce agglomerated silver powder by adding the reducing solution so that the reducing agent in the reducing solution per 1kg of silver (Ag) in the silver source solution is introduced at a rate of 1 to 100g / min Flakes, characterized in that the step provides a powder manufacturing method.
  • the present invention is the primary silver particles having a particle size of 0.1 to 0.8 ⁇ m agglomerated, by milling through beads using agglomerated silver powder having an average particle diameter of 2.0 to 10.0 ⁇ m, specific surface area of 1.0 to 2.5m 2 / g Flake Silver, which is a flake powder, provides a powder.
  • the flake silver powder provides a flake silver powder, characterized in that the average particle diameter (D50) of 0.5 to 3.0 ⁇ m, specific surface area 1.0 to 3.0m 2 / g, tap density 2.5 to 4.5g / cc.
  • D50 average particle diameter
  • the present invention is the flake silver powder; And a binder resin; provides a conductive paste comprising a.
  • the present invention uses agglomerated powder having a primary particle size of 0.1 to 0.8 ⁇ m and an average particle size of 2.0 to 10.0 ⁇ m, thereby making it possible to use general milling equipment such as attrition mill and beads of general size of 1 to 5 mm. Therefore, it is possible to provide a method for producing uniform and fine flake silver powder having excellent electrical conductivity with a wide contact area between particles without causing aggregation between powders at low manufacturing cost.
  • agglomerated powders having a primary particle diameter of 0.1 to 0.8 ⁇ m, an average particle diameter of 2.0 to 10.0 ⁇ m, and a specific surface area of 1.0 to 2.5 m 2 / g are used at a low production cost by using a general milling equipment and 1 to 5 mm beads. It is possible to provide a method for producing flake silver powder having a mean particle diameter (D50) to 3.0 ⁇ m, a specific surface area of 1.0 to 3.0 m 2 / g, and a tap density of 2.5 to 4.5 g / cc.
  • D50 mean particle diameter
  • D50 mean particle diameter
  • the fine flake silver powder uses a touch screen panel (TSP), a flexible printed circuit board (FPCB), or an RFID, in which an electrode pattern having a line width of 80 ⁇ m or less is used. It may be particularly suitably used for antennas, metal meshes for transparent electrodes, and the like.
  • FIG. 1 The schematic diagram which flake-shaped the spherical powder with the raw material powder in FIG. 1 is shown.
  • Example 2 shows a SEM photograph of the aggregated silver powder according to Example 1 of the present invention.
  • Example 3 shows a SEM photograph of the flake silver powder according to Example 1 of the present invention.
  • Example 4 is a SEM photograph of the aggregated silver powder according to Example 2 of the present invention.
  • Example 5 is a SEM photograph of the flake silver powder according to Example 2 of the present invention.
  • Example 6 is a SEM photograph of the aggregated silver powder according to Example 3 of the present invention.
  • Example 7 shows an SEM photograph of the flake silver powder according to Example 3 of the present invention.
  • Flakes silver powder manufacturing method comprises a raw material powder manufacturing step (S1), flakes step (S2) and after-treatment step (S3).
  • the flake forming step (S2) according to the present invention is necessarily included, and steps other than those which may unnecessarily obscure the subject matter of the invention can be omitted.
  • Raw material powder manufacturing step (S1) is a step for producing agglomerated silver powder, the specific method is as follows.
  • a silver source is added to a silver source solution to reduce silver (Ag) to precipitate silver particles. That is, after preparing a silver source solution containing silver (Ag), a reducing solution containing a reducing agent is added to reduce the silver to obtain a silver powder. The reducing solution may be slowly added or temporarily added while the silver source solution is stirred.
  • the silver source solution containing silver (Ag) is not limited as long as it is a solution in which silver particles can be precipitated by a reducing agent, and a silver oxide solution, a silver nitrate solution, a silver salt complex, or a silver intermediate solution can be used. Can be.
  • the silver oxide solution will be described as an example.
  • the pH in the silver source solution can be adjusted using an alkali solution.
  • an alkaline solution preferably sodium hydroxide (NaOH) solution
  • NaOH sodium hydroxide
  • a silver source solution containing silver oxide is prepared and used. If the pH of the silver source solution is 10 or less, the unreacted reaction may not occur because the rate of reduction by the reducing agent added during the precipitation of the silver particles is slowed.
  • An alkaline solution sodium hydroxide (NaOH, 45% concentration) is added in an amount of 20 to 50 parts by weight based on 100 parts by weight of silver nitrate solution (20 to 50% concentration) to adjust the pH of the silver source solution to 10 to 14.
  • the reducing agent may be used alone or in combination of any one or more selected from the group consisting of glucose, ascorbic acid, hydrazine, hydroquinone and formalin.
  • the reducing agent may react with all the ions using 0.1 to 1.5 equivalents of the silver ion content, and when insufficient, unreacted reaction may occur, and residual organic matter may be deposited in the powder when over-added.
  • the primary particle size of the aggregated silver powder prepared by adjusting the rate of introducing the reducing solution into the silver source solution may be adjusted.
  • the feed rate of the reducing solution can be expressed as the feed rate of the reducing agent in terms of (solids) mass into which the reducing agent in the reducing solution is added, compared to 1 kg of silver (Ag) in the silver source solution, and the present invention provides a reducing agent compared to 1 kg of silver (Ag). Reducing solution is added so that is added at 1 to 100g / min.
  • a relatively fine agglomerated silver powder having a primary particle size of 0.1 ⁇ m is prepared when injected at a rate close to 100 g / min, and a primary particle diameter of 0.8 is added when injected at a speed close to 1 g / min.
  • a relatively coarse aggregated silver powder close to ⁇ m is produced. If the feed rate is less than 1g / min or more than 100g / min the effect of controlling the primary particle size of the aggregated silver powder produced is insignificant.
  • the primary particle size of the aggregated silver powder does not become smaller than 0.1 ⁇ m, and even if the reducing agent is added at a rate of less than 1 g / min, the primary particle diameter of the aggregated silver powder is 0.8. It is not larger than ⁇ m. That is, when the reducing solution input rate is controlled within the above range, the aggregated silver powder having a primary particle size adjustable within the range of 0.1 to 0.8 ⁇ m may be prepared.
  • a reducing solution is added to the silver source solution at the content ratio and the feeding rate to cause a precipitation reaction to precipitate the aggregated silver powder.
  • Flaking step (S2) is a step to flake through the milling (milling) through the beads by slurrying the aggregated silver powder, a specific method is as follows.
  • Agglomerated silver powder may be used agglomerated silver powder prepared through the raw material powder manufacturing step (S1), but is not limited thereto, and primary silver particles having a particle diameter of 0.1 to 0.8 ⁇ m are agglomerated, and the average particle diameter is 2.0 to 10.0 ⁇ and a powder having a specific surface area of 1.0 to 2.5 m 2 / g are used.
  • Agglomerated silver powders are slurried.
  • the lubricant is added to the solvent, stirred until the lubricant is dissolved, and then the aggregated silver powder is dispersed in the solvent to form a slurry.
  • the flakes obtained are highly dependent on the properties of the powder.
  • a solvent in which the aggregated silver powder is dispersed a mixed solvent of water, an organic solvent, and water and an organic solvent can be used. In consideration of the residual of the solvent component as a contaminant on the particle surface, it is preferable to use a solvent having a composition close to water.
  • an organic solvent alone in consideration of the stabilization of the quality of the aggregated silver powder in the slurry to increase the dispersibility of the powder.
  • the use of alcohols such as methanol, ethanol, ethylene glycol, etc. as the organic solvent is highly volatile, and the flake silver powder may have little residue on the particle surface during drying.
  • the blending amount of the aggregated silver powder in the solvent is appropriately determined.
  • the solvent is used 30 to 50 parts by weight based on 100 parts by weight of the aggregated silver powder, and the lubricant is 0.5 to 5 parts by weight based on 100 parts by weight of the aggregated silver powder.
  • the slurry containing the aggregated silver powder is milled using an impact mill using the impact of the beads.
  • the attrition mill is a milling apparatus in which a shaft and zirconia balls are filled in a vertical alumina. Detailed milling process is shown in Table 1 below.
  • Powder loading 5 ⁇ 8kg Ball material Zirconia Ball size 1-5mm Ball input 250 to 500 wt.% Of Ag powder Milling time 3 ⁇ 6hrs Milling speed 300 ⁇ 700rpm slush Fatty acid group menstruum Alcohol group
  • the fine flakes are partially flake, and the contact area between the powders is small, so that the conductivity decreases. Accordingly, when the mechanical collision force is increased to increase the conductivity, the flake is strengthened and the conductivity is reduced. Was improved but difficult to obtain fine powder.
  • the flake powder when used to obtain the fine flake powder, the flakes are partially flaked as in the case of using the spherical powder, but the contact area between the aggregated powders is wide, so that the flake silver powder having fine conductivity and excellent conductivity can be obtained.
  • the particle size of the aggregated powder which is a raw material powder, the particle size of the flake silver powder is easy.
  • Post-treatment step (S3) is a purification step including a washing, drying, and disintegration process, by using a screen (screen) to separate the ball / slurry, and further adding a solvent and stirring silver
  • the powder is washed, dried and crushed.
  • the prepared flake may be a step of gravity settling the powder, removing a solution containing an organic material such as a lubricant on the upper layer, and then drying the slurry at 80 ° C. for 10 hrs.
  • the washing method is not particularly limited, but a method of recovering the flake silver powder by injecting the flake silver powder solid-liquid separated from the slurry into the washing liquid, stirring using a stirrer or an ultrasonic cleaner, and then solid-liquid separation again can be used. .
  • a method of recovering the flake silver powder by injecting the flake silver powder solid-liquid separated from the slurry into the washing liquid, stirring using a stirrer or an ultrasonic cleaner, and then solid-liquid separation again can be used.
  • cleaning liquid may use water, in order to remove a lubricant and organic substance efficiently, it is preferable to use aqueous alkali solution or ethanol aqueous solution.
  • the flake silver powder prepared through the post treatment has an average particle diameter (D50) of 0.5 to 3.0 ⁇ m, a specific surface area of 1.0 to 3.0 m 2 / g, and a tap density of 2.5 to 4.5 g / cc.
  • D50 average particle diameter
  • the flake silver powder produced by the flake silver powder manufacturing method according to an embodiment of the present invention is fine with a wire width of 80 ⁇ m or less, such as a touch screen panel (TSP), a flexible printed circuit board (FPCB), an RFID antenna, a metal mesh for a transparent electrode, and the like. It is most suitable for use in conductive pastes for electronic components requiring electrode patterns.
  • the agglomerated silver powder solution obtained as described above was filtered using Nutsche, washed with 50 L of pure water, and dried at 80 ° C. for 10 hours to obtain agglomerated silver powder.
  • the SEM photograph of the aggregated silver powder obtained by the above process is shown in Fig. 2, and the characteristics thereof are as shown in Table 2, the primary particle diameter is 0.1 ⁇ 0.3 ⁇ m, the average particle diameter is 3.5 ⁇ m, the specific surface area is 2.3m 2 / g.
  • a slurry of 0.06 kg was added to 3.0 kg of ethanol and stirred until the lubricant was dissolved. Then, 6 kg of the prepared aggregated silver powder was added and stirred well to prepare a silver slurry solution.
  • Table 1 The conditions as shown in Table 1, that is, 30 kg of zirconia beads having a diameter of 1.0 mm were filled in an Attrition mill, and then a silver slurry solution was added thereto to apply a mechanical shock at a rotational speed of 500 rpm to flake.
  • flakes were processed for 3 hours. Thereafter, the slurry was transferred from the Attrition mill to the washing tank by using a pump, allowed to stand for a certain time to settle the flake silver powder, and then the supernatant was discarded. 10 L of ethanol was further added for washing the powder, followed by stirring for a predetermined time, and the above process was repeated to obtain a high concentration of silver slurry, and then dried at 80 ° C. for 10 hours to obtain flake silver powder.
  • Fine flake silver powder was obtained by pulverizing and sieving the flake silver powder obtained as mentioned above.
  • the SEM photograph is shown in FIG.
  • Table 3 D10 0.6 micrometer, D50 1.0 micrometer, D90 2.1 micrometer Dmax 4.4micrometer by PSA, tap density was 3.8g / cc, and specific surface area was 2.2m ⁇ 2> / g.
  • Agglomerated silver powder was prepared in the same manner as in Example 1 except that the reducing agent solution was added at a rate of 80 ml / min.
  • the SEM photograph of the aggregated silver powder obtained by the above process is shown in FIG. 4, and the characteristics thereof are as shown in Table 2, and the primary particle diameter is 0.2 to 0.5 ⁇ m, the average particle diameter is 4.8 ⁇ m, and the specific surface area is 1.5 m. 2 / g.
  • Flaking and post-treatment were performed in the same manner as in Example 1 using the prepared aggregated silver powder, and the SEM image of the obtained fine flake silver powder is shown in FIG. 5.
  • Table 3 D10 0.8 micrometer, D50 1.7 micrometer, D90 3.9 micrometer Dmax 10.0 micrometer by PSA, tap density was 4.2 g / cc, and specific surface area was 1.6 m ⁇ 2> / g.
  • Agglomerated silver powder was prepared in the same manner as in Example 1 except that the reducing agent solution was added at a rate of 10 ml / min.
  • the SEM image of the aggregated silver powder obtained by the above process is shown in FIG. 6, and the characteristics thereof are as shown in Table 2, and the primary particle diameter is 0.4 to 0.7 ⁇ m, the average particle diameter is 8.5 ⁇ m, and the specific surface area is 1.1 m. 2 / g.
  • Flaking and post-treatment were performed in the same manner as in Example 1 using the prepared aggregated silver powder, and the SEM image of the obtained fine flake silver powder is shown in FIG. 7.
  • Table 3 D10 1.0 micrometer, D50 2.5 micrometer, D90 5.4 micrometer Dmax 12.0 micrometer by PSA, tap density were 4.3 g / cc, and the specific surface area was 1.2 m ⁇ 2> / g.
  • the silver source solution was stirred, the reduction solution was added collectively to this silver source solution, and it stirred for further 5 minutes after completion
  • the SEM photograph of the spherical silver powder obtained by the above process is shown in FIG. 8, The characteristic was 1.1 micrometer in average particle diameter, and 0.9 m ⁇ 2> / g of specific surface areas as shown in Table 2.
  • Example 2 By using the spherical silver powder flakes in the same manner as in Example 1 to obtain a fine flake silver powder, the SEM image of the obtained fine flake silver powder is shown in FIG. As shown in Table 3, D10 0.8 micrometer, D50 1.4 micrometer, D90 2.7 micrometer, Dmax 5.8 micrometer, tap density was 3.4 g / cc, and specific surface area was 1.2 m ⁇ 2> / g by PSA.
  • Spherical silver powder was prepared in the same manner as in Comparative Example 1.
  • Flaking and post-treatment were carried out in the same manner as in Example 1, except that the milling time was 6 hours using the spherical silver powder, and the SEM image of the obtained fine flake silver powder is shown in FIG. 10.
  • Table 3 D10 0.9 ⁇ m, D50 1.8 ⁇ m, D90 4.5 ⁇ m Dmax 13.2 ⁇ m, tap density of 3.1g / cc and specific surface area of the PSA were 1.6m 2 / g.
  • Spherical silver powder was prepared in the same manner as in Comparative Example 1.
  • the spherical silver powder was flaked and post-treated in the same manner as in Example 1 except that the rotational speed was 700 rpm and the milling time was 6 hours.
  • the SEM photograph of the obtained flake silver powder is shown in FIG. 11. As shown in Table 3, D10 1.3 ⁇ m, D50 4.5 ⁇ m, D90 11.2 ⁇ m Dmax 30.2 ⁇ m, tap density 2.0g / cc, specific surface area 2.4M 2 / g by PSA.
  • a silver oxide solution was prepared in the same manner as in Example 1. Then, 3.0 kg of a 50% concentration reduction solution was added to the silver oxide solution by dumping to reduce the aggregated silver powder.
  • the reducing agent used at this time was hydroquinone, and the reaction temperature was maintained at 25 ° C. Thereafter, the mixture was washed and dried in the same manner as in Example 1 to obtain aggregated silver powder.
  • the SEM photograph of the aggregated silver powder obtained by the above process is shown in FIG. 12, and the characteristics thereof are as shown in Table 2, the primary particle diameter is 0.1 ⁇ m or less, the average particle diameter is 1.5 ⁇ m, and the specific surface area is 3.2 m 2. / g.
  • Example 2 Flake and post-treatment in the same manner as in Example 1 using the prepared aggregated silver powder and obtained fine flake silver powder D10 0.5 ⁇ m, D50 0.8 ⁇ m, D90 1.3 ⁇ m Dmax by PSA as shown in Table 3
  • the tap density was 3.2 m / g and the specific surface area was 3.1 m 2 / g.
  • the silver source solution was stirred, the reduction solution was added collectively to this silver source solution, and it stirred for further 5 minutes after completion
  • the SEM photograph of the aggregated silver powder obtained by the above process is shown in FIG. 13, and the characteristics thereof are 0.8-1.1 ⁇ m in primary particle diameter, 8.0 ⁇ m in average particle diameter, and 0.4 m in specific surface area as shown in Table 2. 2 / g.
  • Flaking and post-treatment were carried out in the same manner as in Example 1 using the prepared aggregated powder, and the SEM photograph of the obtained flake silver powder is shown in FIG. 14.
  • Table 3 D10 2.4 micrometers, D50 6.6 micrometers, D90 14.7 micrometers Dmax 34.7 micrometers by PSA, 2.9 g / cc of tap densities, and specific surface area were 1.0 m ⁇ 2> / g.
  • Example 1 Cohesive 0.1-0.3 3.5 2.3
  • Example 2 Cohesive 0.2-0.5 4.8 1.5
  • Example 3 Cohesive 0.4-0.6 8.5 1.1 Comparative Example 1 rectangle - 1.1 0.9 Comparative Example 2 rectangle - 1.1 0.9 Comparative Example 3 rectangle - 1.1 0.9 Comparative Example 4 Cohesive ⁇ 0.1 1.5 3.2 Comparative Example 5 Cohesive 0.8 ⁇ 1.1 8.0 0.4
  • the fine flakes silver powder can be prepared using the spherical powder through Comparative Example 1, but it can be seen that the conductivity is poor due to partial flakes, and by increasing the milling time through Comparative Example 2 by increasing the mechanical impact force Although the flakes have been strengthened but also partially flakes, the conductivity is not good.
  • the comparative example 3 shows that the conductivity is slightly improved by increasing the rotational speed as well as the milling time, thereby increasing the mechanical impact force, but the aggregation between particles is improved. It can be seen that the fine flakes generated are difficult to obtain powder.

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Abstract

La présente invention concerne un procédé de fabrication d'une poudre d'argent en paillettes, le procédé comprenant une étape d'écaillage (S2) consistant en l'obtention d'une poudre en paillettes par broyage dans des billes à l'aide d'une poudre d'argent agglomérée en tant que poudre-matière première, la poudre d'argent agglomérée possédant un diamètre moyen allant de 2,0 à 10,0 µm et une surface spécifique allant de 1,0 à 2,5 m2/g par agglomération de particules d'argent primaires possédant un diamètre allant de 0,1 à 0,8 µm. La présente invention concerne un procédé de fabrication dans lequel, à l'aide d'une poudre agglomérée plutôt qu'une poudre sphérique en tant que poudre-matière première, un dispositif de broyage à usage général et des billes sont utilisés pour produire, à moindre coût, une poudre d'argent en paillettes uniforme et fine qui ne fait pas preuve d'agglomération entre les poudres et fait preuve d'une excellente conductivité électrique grâce à la surface de contact importante entre les particules.
PCT/KR2016/011090 2016-10-04 2016-10-04 Procédé de fabrication de poudre d'argent de type paillettes à l'aide de poudre d'argent agglomérée WO2018066722A1 (fr)

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