WO2022079983A1 - 金属粉 - Google Patents
金属粉 Download PDFInfo
- Publication number
- WO2022079983A1 WO2022079983A1 PCT/JP2021/028883 JP2021028883W WO2022079983A1 WO 2022079983 A1 WO2022079983 A1 WO 2022079983A1 JP 2021028883 W JP2021028883 W JP 2021028883W WO 2022079983 A1 WO2022079983 A1 WO 2022079983A1
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- WO
- WIPO (PCT)
- Prior art keywords
- layer
- fine
- metal particles
- middle layer
- metal
- Prior art date
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Classifications
-
- 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
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
- B22F1/052—Metallic powder characterised by the size or surface area of the particles characterised by a mixture of particles of different sizes or by the particle size distribution
-
- 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
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
-
- 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
-
- 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
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
-
- 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
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
- H01B1/026—Alloys based on copper
-
- 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
- B22F2301/00—Metallic composition of the powder or its coating
- B22F2301/25—Noble metals, i.e. Ag Au, Ir, Os, Pd, Pt, Rh, Ru
- B22F2301/255—Silver or gold
-
- 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
- B22F2304/00—Physical aspects of the powder
- B22F2304/10—Micron size particles, i.e. above 1 micrometer up to 500 micrometer
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/0425—Copper-based alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/0466—Alloys based on noble metals
Definitions
- the present invention relates to metal powder.
- the present invention relates to metal powders suitable for applications where conductivity is required.
- Conductive paste is used in the manufacture of printed circuit boards for electronic devices.
- This paste contains metal powder, binder and solvent.
- Metal powder is a collection of fine metal particles.
- a pattern for connecting an element to another element can be obtained by means such as printing and etching using this paste. This pattern is heated. By heating, the fine metal particles are sintered with other adjacent fine metal particles. Since the pattern is an electron path, the pattern needs to have good conductivity.
- Japanese Patent Application Laid-Open No. 2007-254845 discloses particles whose material is silver and which is in the form of flakes. These particles are formed by processing spherical particles with a ball mill. This particle partially overlaps with other particles in the pattern. This overlap can contribute to the conductivity of the pattern.
- An object of the present invention is to provide a metal powder capable of obtaining a pattern having excellent conductivity.
- the fine laminated metal particles according to the present invention are Flake-shaped first layer, And flakes, laminated with the first layer, and has a second layer that is integral with this first layer.
- the second layer is partially separated from the first layer.
- the material of the fine laminated metal particles is a conductive metal.
- Preferred conductive metals are silver or copper.
- the metal powder according to the present invention has a large number of fine metal particles.
- These fine metal particles include fine laminated metal particles.
- Each micro-laminated metal particle is Flake-shaped first layer, And flakes, laminated with the first layer, and has a second layer that is integral with this first layer.
- the ratio of the fine laminated metal particles to the fine metal particles is 30% by mass or more.
- the average particle size of the metal powder is 0.1 ⁇ m or more and 30 ⁇ m or less.
- the standard deviation of the particle size of the metal powder is 15 ⁇ m or less.
- the metal particles partially overlap with the adjacent metal particles. This overlap contributes to the conductivity of the pattern in the length direction.
- the electrical resistance between the first layer and the second layer is extremely small.
- the metal particles contribute to the conductivity of the pattern in the thickness direction. This pattern is extremely conductive.
- FIG. 1 is a plan view showing fine laminated metal particles according to an embodiment of the present invention.
- FIG. 2 is a front view showing the fine laminated metal particles of FIG. 1.
- FIG. 3 is an enlarged cross-sectional view taken along the line III-III of FIG.
- FIG. 4 is a schematic cross-sectional view showing a pattern obtained from the conductive paste containing the fine laminated metal particles of FIG. 1-3 together with a substrate.
- FIG. 5 is a photomicrograph showing a metal powder containing the fine laminated metal particles of FIG. 6
- (a)-(c) are micrographs showing the metal powder containing the fine laminated metal particles of FIG. 1.
- 7 (a)-(c) are micrographs showing the metal powder containing the fine laminated metal particles of FIG. 1.
- 8 (a)-(c) are micrographs showing the metal powder containing the fine laminated metal particles of FIG. 1.
- the metal powder according to the present invention is a collection of a large number of fine metal particles. These fine metal particles include a large number of fine laminated metal particles.
- FIG. 1-3 shows one microlaminated metal particle 2.
- the main component of the fine laminated metal particles 2 is a conductive metal.
- a conductive paste can be obtained by mixing a metal powder, a solvent, a binder, a dispersant and the like.
- the fine laminated metal particles 2 have a center layer 4, an upper middle layer 6, an upper end layer 8, a lower middle layer 10, and a lower end layer 12.
- the center layer 4 is flaky. In other words, the center layer 4 has the shape of a thin plate.
- the contour of the center layer 4 in a plan view is a polygon (mainly a triangle or a hexagon).
- the center layer 4 is a crystal of a conductive metal.
- the center layer 4 is a silver or copper crystal.
- the upper middle layer 6 is flake-shaped. In other words, the upper middle layer 6 has the shape of a thin plate.
- the upper middle layer 6 is a crystal of a conductive metal.
- the upper middle layer 6 is a silver or copper crystal.
- the upper middle layer 6 is laminated with the center layer 4.
- the upper middle layer 6 is integrated with the center layer 4.
- the upper middle layer 6 belongs to the same crystal as the center layer 4. In the present invention, when two layers belong to the same crystal, they are considered to be one. It should be noted that the two layers that are one do not have to belong to the same crystal grain. In other words, each layer may be polycrystalline. Since the upper middle layer 6 is integrated with the center layer 4, the electric resistance between the center layer 4 and the upper middle layer 6 is extremely small.
- the center layer 4 and the upper middle layer 6 are formed by the growth of crystals. Therefore, in the actual fine laminated metal particles 2, the center layer 4 and the upper middle layer 6 cannot be clearly distinguished. In the front view shown in FIG. 2, apparently the two layers can be distinguished.
- a space S1 exists between the center layer 4 and the upper middle layer 6.
- the upper middle layer 6 is partially separated from the center layer 4.
- the upper end layer 8 is in the form of flakes. In other words, the upper end layer 8 has the shape of a thin plate.
- the upper end layer 8 is a crystal of a conductive metal. Preferably, the upper end layer 8 is a silver or copper crystal.
- the upper end layer 8 is laminated with the upper middle layer 6.
- the upper end layer 8 is integrated with the upper middle layer 6.
- the upper end layer 8 belongs to the same crystal as the upper middle layer 6. Therefore, the electrical resistance between the upper middle layer 6 and the upper end layer 8 is extremely small.
- the upper middle layer 6 and the upper end layer 8 are formed by the growth of crystals. Therefore, in the actual fine laminated metal particles 2, the upper middle layer 6 and the upper end layer 8 cannot be clearly distinguished. In the front view shown in FIG. 2, apparently the two layers can be distinguished.
- a space S2 exists between the upper middle layer 6 and the upper end layer 8.
- the upper end layer 8 is partially separated from the upper middle layer 6.
- the lower middle layer 10 is flaky. In other words, the lower middle layer 10 has the shape of a thin plate.
- the lower middle layer 10 is a crystal of a conductive metal.
- the lower middle layer 10 is a silver or copper crystal.
- the lower middle layer 10 is laminated with the center layer 4.
- the lower middle layer 10 is integrated with the center layer 4.
- the lower middle layer 10 belongs to the same crystal as the center layer 4. Therefore, the electrical resistance between the center layer 4 and the lower middle layer 10 is extremely small.
- the center layer 4 and the lower middle layer 10 are formed by the growth of crystals. Therefore, in the actual fine laminated metal particles 2, the center layer 4 and the lower middle layer 10 cannot be clearly distinguished. In the front view shown in FIG. 2, apparently the two layers can be distinguished.
- a space S3 exists between the center layer 4 and the lower middle layer 10.
- the lower middle layer 10 is partially separated from the center layer 4.
- the lower end layer 12 is flaky. In other words, the lower end layer 12 has the shape of a thin plate.
- the lower end layer 12 is a crystal of a conductive metal. Preferably, the lower end layer 12 is a silver or copper crystal.
- the lower end layer 12 is laminated with the lower middle layer 10.
- the lower end layer 12 is integrated with the lower middle layer 10.
- the lower end layer 12 belongs to the same crystal as the lower middle layer 10. Therefore, the electrical resistance between the lower middle layer 10 and the lower end layer 12 is extremely small.
- the lower middle layer 10 and the lower end layer 12 are formed by the growth of crystals. Therefore, in the actual fine laminated metal particles 2, the lower end layer 12 and the lower middle layer 10 cannot be clearly distinguished. In the front view shown in FIG. 2, apparently the two layers can be distinguished.
- a space S4 exists between the lower middle layer 10 and the lower end layer 12.
- the lower end layer 12 is partially separated from the lower middle layer 10.
- the center layer 4, the upper middle layer 6, the upper end layer 8, the lower middle layer 10 and the lower end layer 12 belong to the same crystal.
- FIG. 4 is a schematic cross-sectional view showing a pattern 14 obtained from the conductive paste containing the fine laminated metal particles 2 of FIG. 1-3 together with the base 16.
- the arrow X represents the length direction of the pattern 14
- the arrow Y represents the thickness direction of the pattern 14.
- the flake-shaped surface of the fine laminated metal particles 2 is in contact with the flake-shaped surface of the adjacent fine laminated metal particles 2. Since the surfaces are in contact with each other, the contact area of these fine laminated metal particles 2 is large. Therefore, electricity can easily flow between these fine laminated metal particles 2. The electrical resistance of this paste in the length direction is small.
- the stacking direction of the fine laminated metal particles 2 (which is also the thickness direction of the fine laminated metal particles 2) substantially coincides with the thickness direction of the paste.
- the layer is integrated with the other layers. Therefore, the electrical resistance of this paste in the thickness direction is small.
- the fine laminated metal particles 2 according to the present invention can provide a paste having excellent conductivity.
- the fine laminated metal particles 2 have a space (S1-S4).
- the apparent density of the metal powder containing the fine laminated metal particles 2 having a space is small.
- the layer is integral with the other layers. Therefore, even in the presence of space, the electrical resistance between the layers is small.
- This metal powder is lightweight and has low electrical resistance. The paste containing this metal powder can be obtained at low cost.
- the fine laminated metal particles 2 shown in FIG. 1-3 have five layers.
- the number of layers may be 4 or less, and may be 6 or more.
- the fine metal particles having two or more flake layers that are integrated are referred to as "fine laminated metal particles".
- the number of layers is preferably 3 or more.
- the number of layers is preferably 15 or less, more preferably 9 or less, and particularly preferably 5 or less.
- the fine laminated metal particles 2 shown in FIG. 1-3 have other layers on both the upper side and the lower side of the center layer 4.
- the fine laminated metal particles 2 may have the other layer on only one side of the center layer 4.
- the metal powder may contain fine metal particles other than the fine laminated metal particles 2.
- the fine metal particles other than the fine laminated metal particles 2 include agglomerate particles, spherical particles, flake-like particles, and polyhedral particles.
- the ratio of the fine laminated metal particles 2 to the fine metal particles is preferably 30% by mass or more, more preferably 50% by mass or more, and particularly preferably 60% by mass or more.
- the ideal ratio is 100% by mass.
- the average particle size D50 of the metal powder is preferably 0.1 ⁇ m or more and 30 ⁇ m or less.
- a high filling factor can be achieved at the time of printing with a metal powder having an average particle diameter D50 of 0.1 ⁇ m or more.
- the average particle size D50 is more preferably 2.0 ⁇ m or more, and particularly preferably 3.0 ⁇ m or more.
- a fine pattern 14 can be obtained from a metal powder having an average particle diameter D50 of 30 ⁇ m or less. From this viewpoint, the average particle diameter D50 is more preferably 15 ⁇ m or less, and particularly preferably 7 ⁇ m or less.
- the minimum particle size Dmin is preferably 0.1 ⁇ m or more.
- the maximum particle diameter D50max is preferably 30 ⁇ m or less.
- the standard deviation ⁇ of the particle size in the metal powder is preferably 15 ⁇ m or less.
- a homogeneous pattern 14 can be obtained from a metal powder having a standard deviation ⁇ of 15 ⁇ m or less. From this point of view, the standard deviation ⁇ is more preferably 10 ⁇ m or less, and particularly preferably 7 ⁇ m or less.
- the average particle diameter D50, the minimum particle diameter Dmin, the maximum particle diameter D50max and the standard deviation ⁇ are measured by a laser diffraction type particle size distribution meter.
- a laser diffraction type particle size distribution meter As an example of the measuring instrument, "LA-950V2" manufactured by HORIBA, Ltd. can be mentioned.
- the metal structure of the fine laminated metal particles 2 is a single crystal.
- the fine laminated metal particles 2 can contribute to the conductivity of the paste.
- the fine laminated metal particles 2 may have a metal and an organic compound adhering to the surface of the metal. This organic compound is chemically bonded to the metal.
- the main component of the fine laminated metal particles 2 is a metal.
- the ratio of the metal in the fine laminated metal particles 2 is preferably 99.0% by mass or more, and particularly preferably 99.5% by mass or more.
- the fine laminated metal particles 2 do not have to contain an organic compound.
- silver powder is obtained by the reduction method.
- This manufacturing method (1) Step of preparing an aqueous silver salt solution, (2) A step of adding a reducing agent to this aqueous solution while stirring this aqueous solution to precipitate flakes whose material is silver. And (3) the step of growing flakes in a spiral shape while further stirring the aqueous solution is included.
- the flakes generally grow in the thickness direction (vertical direction in FIG. 3). As the flakes grow, the contours of the flakes rotate. Such growth is referred to as "spiral growth" in the present invention.
- silver particles fine laminated metal particles 2 in which a plurality of layers are laminated can be obtained.
- the preferable silver salt is silver nitrate.
- the concentration of the silver salt in the aqueous solution is preferably 0.1 M or more and 1.0 M or less.
- the growth of particles can be promoted by using an aqueous solution having a concentration of 0.1 M or more. From this point of view, this concentration is more preferably 0.3 M or more, and particularly preferably 0.4 M or more.
- this concentration is more preferably 0.8 M or less, and particularly preferably 0.7 M or less.
- the pH of this aqueous solution can be adjusted by containing the acid in the aqueous solution prepared in the above step (1).
- the pH is preferably 5 or less, more preferably 3 or less, and particularly preferably 2 or less, from the viewpoint that agglomeration of particles is suppressed during crystal growth and therefore a flake-like layer is likely to precipitate.
- acids suitable for adjusting PH include acetic acid, propionic acid, trifluoroic acid, hydrofluoric acid, nitric acid, hydrochloric acid, sulfuric acid and phosphoric acid. Hydrochloric acid, nitric acid and sulfuric acid are particularly preferred.
- the aqueous solution prepared in the above step (1) preferably contains a dispersant.
- a preferred dispersant is a glycol-based dispersant. From the aqueous solution containing the glycol-based dispersant, silver powder having a small standard deviation ⁇ of the particle size can be obtained.
- a particularly preferred dispersant is polyethylene glycol.
- Examples of the reducing agent added in the above steps (2) and (3) include hydrazine, a hydrazine compound, formaldehyde, glucose, L-ascorbic acid and D-erythorbic acid.
- the charging rate of the reducing agent affects the formation of the fine laminated metal particles 2. If the charging speed is too slow, the flake-like layer is unlikely to precipitate. On the other hand, if the feeding speed is too high, it is difficult for the flakes to grow in a spiral shape. It is preferable that the reducing agent is added in an amount necessary for reducing 5 g or more and 30 g or less of silver nitrate per second. A rate at which the amount of the reducing agent required for reducing 8 g or more and 20 g or less of silver nitrate is added in one second is particularly preferable.
- the stirring speed is preferably 100 rpm or more and 500 rpm or less.
- the temperature of the aqueous solution is preferably 20 ° C. or higher and 80 ° C. or lower.
- the required time (that is, stirring time) of the above steps (2) and (3) is preferably 10 minutes or more and 60 minutes or less.
- (A) Set the concentration of silver nitrate in the dispersion in a predetermined range (b) Use a predetermined acid and set the pH of the silver nitrate aqueous solution in a predetermined range (c) Use a predetermined dispersant. (D) The predetermined reducing agent is added at a predetermined speed, and (e) the stirring speed is set within a predetermined range.
- Example 1 20 cc of hydrazine was added to 0.5 liter of distilled water to obtain a reducing solution.
- 50 g of silver nitrate was added to 1 liter of distilled water, and 5 g of polyethylene glycol was further added to obtain an aqueous solution.
- Sulfuric acid was added to this aqueous solution until the pH reached 2.
- the reducing solution was added to the aqueous solution at a rate of 100 cc / sec while stirring the aqueous solution at a rate of 150 rpm. Stirring was continued for another 30 minutes while keeping the temperature of this aqueous solution at 20 ° C. From this aqueous solution, silver powder containing fine laminated metal particles was precipitated.
- FIG. 5-8 shows a micrograph of this silver powder.
- Example 2 The silver powder of Example 2 was obtained in the same manner as in Example 1 except that 10 g of polyethylene glycol was added.
- the silver powder of Example 3 was obtained in the same manner as in Example 1 except that 20 g of polyethylene glycol was added.
- Comparative Example 2 The silver powder of Comparative Example 2 was obtained in the same manner as in Example 1 except that the concentration of silver nitrate in the aqueous solution was 0.1 M, polyvinylpyrrolidone was used instead of polyethylene glycol, and the stirring speed was 300 rpm. Each fine particle of this silver powder was spherical.
- Comparative Example 3 The silver powder obtained by the method of Comparative Example 2 was subjected to a bead mill, and each particle was made into flakes to obtain the silver powder of Comparative Example 3.
- the sintered body obtained from the silver powder of each example has excellent conductivity. From this evaluation result, the superiority of the present invention is clear.
- the metal powder according to the present invention can be used as a paste for a printing circuit, a paste for an electromagnetic wave shielding film, a paste for a conductive adhesive, a paste for die bonding, and the like.
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- Engineering & Computer Science (AREA)
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Abstract
Description
フレーク状である第一層、
及び
フレーク状であって、第一層と積層されており、この第一層と一体である第二層
を有する。
フレーク状である第一層、
及び
フレーク状であって、第一層と積層されており、この第一層と一体である第二層
を有する。
(1)銀塩水溶液を調製する工程、
(2)この水溶液を撹拌しつつこの水溶液に還元剤を添加し、材質が銀であるフレークを析出させる工程、
及び
(3)水溶液をさらに撹拌しつつ、フレークを螺旋状に成長させる工程
を含んでいる。
(a)分散液における硝酸銀の濃度を所定の範囲に設定すること
(b)所定の酸を使用し、硝酸銀水溶液のPHを所定の範囲に設定すること
(c)所定の分散剤を使用すること
(d)所定の還元剤を所定のスピードで投入すること
及び
(e)撹拌速度を所定の範囲に設定すること
が挙げられる。
0.5リットルの蒸留水に20ccのヒドラジンを投入し、還元液を得た。一方、1リットルの蒸留水に50gの硝酸銀を投入し、さらに5gのポリエチレングリコールを添加して、水溶液を得た。この水溶液に、PHが2になるまで硫酸を添加した。この水溶液を150rpmの速度で撹拌しつつ、この水溶液に100cc/secの速度で還元液を添加した。この水溶液の温度を20℃に保ちつつ、さらに30分間の撹拌を継続した。この水溶液から、微小積層金属粒子を含む銀粉が析出した。図5-8に、この銀粉の顕微鏡写真が示されている。
10gのポリエチレングリコールを投入した他は実施例1と同様にして、実施例2の銀粉を得た。20gのポリエチレングリコールを投入した他は実施例1と同様にして、実施例3の銀粉を得た。
オートクレーブを用いた反応により、フレーク状の微小粒子を含む銀粉を得た。この銀粉の製造方法は、国際公開第2016/125355公報に開示された製造方法とほぼ同じである。
水溶液における硝酸銀の濃度を0.1Mとし、ポリエチレングリコールに代えてポリビニルピロリドンを使用し、撹拌速度を300rpmとした他は実施例1と同様にして、比較例2の銀粉を得た。この銀粉のそれぞれの微小粒子は、球状であった。
比較例2の方法で得られた銀粉をビーズミルに供し、各粒子をフレーク状として、比較例3の銀粉を得た。
銀粉をメタノールに分散させ、ペーストを得た。このペーストにおける銀濃度は、70質量%であった。スライドガラスに、マスキングによって塗布面を形成した。この塗布面のサイズは、8mm×50mmであった。この塗布面に、ペーストを塗布した。このペーストを150℃の温度下で30分間保持し、焼結体を得た。この焼結体の厚みは、10μmであった。この焼結体の電気比抵抗を、Advanced Instrument Technology社の測定装置(コンタクト4ポイントプローブ)で測定した。この結果が、下記の表1に示されている。
焼結の温度を130℃とした他は評価1と同様にして、電気比抵抗を測定した。この結果が、下記の表1に示されている
4・・・センター層
6・・・上ミドル層
8・・・上エンド層
10・・・下ミドル層
12・・・下エンド層
14・・・パターン
16・・・下地
Claims (11)
- フレーク状である第一層、
及び
フレーク状であって、上記第一層と積層されており、上記第一層と一体である第二層
を備えた微小積層金属粒子。 - 上記第二層が部分的に上記第一層と離間している請求項1に記載の微小積層金属粒子。
- その材質が導電性金属である請求項1又は2に記載の微小積層金属粒子。
- 上記導電性金属が銀又は銅である請求項3に記載の微小積層金属粒子。
- 多数の微小金属粒子を備えた金属粉であって、
これらの微小金属粒子が、微小積層金属粒子を含んでおり、
それぞれの微小積層金属粒子が、
フレーク状である第一層、
及び
フレーク状であって、上記第一層と積層されており、上記第一層と一体である第二層
を有する金属粉。 - 上記第二層が部分的に上記第一層と離間している請求項5に記載の金属粉。
- その材質が導電性金属である請求項5又は6に記載の金属粉。
- 上記導電性金属が銀又は銅である請求項7に記載の金属粉。
- 上記微小金属粒子における、上記微小積層金属粒子の比率が、30質量%以上である、請求項5から8のいずれかに記載の金属粉。
- その平均粒子径が0.1μm以上30μm以下である請求項5から9のいずれかに記載の金属粉。
- その粒子径の標準偏差が15μm以下である請求項5から10のいずれかに記載の金属粉。
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
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| CN202180069928.3A CN116348222A (zh) | 2020-10-15 | 2021-08-04 | 金属粉 |
| KR1020237004953A KR20230037636A (ko) | 2020-10-15 | 2021-08-04 | 금속 분말 |
| EP21879725.6A EP4197675A4 (en) | 2020-10-15 | 2021-08-04 | METAL POWDER |
| US18/021,990 US12377461B2 (en) | 2020-10-15 | 2021-08-04 | Metal powder |
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| JP2020173712A JP7080950B2 (ja) | 2020-10-15 | 2020-10-15 | 金属粉 |
| JP2020-173712 | 2020-10-15 |
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|---|---|
| WO2022079983A1 true WO2022079983A1 (ja) | 2022-04-21 |
Family
ID=81207906
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|---|---|
| US (1) | US12377461B2 (ja) |
| EP (1) | EP4197675A4 (ja) |
| JP (1) | JP7080950B2 (ja) |
| KR (1) | KR20230037636A (ja) |
| CN (1) | CN116348222A (ja) |
| WO (1) | WO2022079983A1 (ja) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4680421A1 (en) * | 2023-05-08 | 2026-01-21 | CuNex GmbH | Composition for forming a copper-containing interlayer comprising internal pores |
| EP4688306A1 (en) * | 2023-05-08 | 2026-02-11 | CuNex GmbH | Composition for forming a copper-containing interlayer |
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| JP2007254845A (ja) | 2006-03-24 | 2007-10-04 | Mitsui Mining & Smelting Co Ltd | フレーク銀粉及びその製造方法 |
| JP2016139598A (ja) * | 2015-01-26 | 2016-08-04 | 住友金属鉱山株式会社 | 銀コート銅粉、及びそれを用いた銅ペースト、導電性塗料、導電性シート |
| JP2016138300A (ja) * | 2015-01-26 | 2016-08-04 | 住友金属鉱山株式会社 | 銅粉、及びそれを用いた銅ペースト、導電性塗料、導電性シート |
| WO2016125355A1 (ja) | 2015-02-06 | 2016-08-11 | トクセン工業株式会社 | 導電性の微小粒子 |
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| JP4145127B2 (ja) * | 2002-11-22 | 2008-09-03 | 三井金属鉱業株式会社 | フレーク銅粉及びそのフレーク銅粉の製造方法並びにそのフレーク銅粉を用いた導電性ペースト |
| JP4868716B2 (ja) * | 2004-04-28 | 2012-02-01 | 三井金属鉱業株式会社 | フレーク銅粉及び導電性ペースト |
| JP2016125355A (ja) | 2014-12-26 | 2016-07-11 | 株式会社東芝 | タービン冷却装置 |
| WO2018092671A1 (ja) * | 2016-11-18 | 2018-05-24 | 古河電気工業株式会社 | 接合フィルム、ウエハ加工用テープ、接合体の製造方法および接合体 |
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- 2020-10-15 JP JP2020173712A patent/JP7080950B2/ja active Active
-
2021
- 2021-08-04 EP EP21879725.6A patent/EP4197675A4/en active Pending
- 2021-08-04 WO PCT/JP2021/028883 patent/WO2022079983A1/ja not_active Ceased
- 2021-08-04 US US18/021,990 patent/US12377461B2/en active Active
- 2021-08-04 CN CN202180069928.3A patent/CN116348222A/zh active Pending
- 2021-08-04 KR KR1020237004953A patent/KR20230037636A/ko active Pending
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| JP2007254845A (ja) | 2006-03-24 | 2007-10-04 | Mitsui Mining & Smelting Co Ltd | フレーク銀粉及びその製造方法 |
| JP2016139598A (ja) * | 2015-01-26 | 2016-08-04 | 住友金属鉱山株式会社 | 銀コート銅粉、及びそれを用いた銅ペースト、導電性塗料、導電性シート |
| JP2016138300A (ja) * | 2015-01-26 | 2016-08-04 | 住友金属鉱山株式会社 | 銅粉、及びそれを用いた銅ペースト、導電性塗料、導電性シート |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4680421A1 (en) * | 2023-05-08 | 2026-01-21 | CuNex GmbH | Composition for forming a copper-containing interlayer comprising internal pores |
| EP4688306A1 (en) * | 2023-05-08 | 2026-02-11 | CuNex GmbH | Composition for forming a copper-containing interlayer |
| EP4680421B1 (en) * | 2023-05-08 | 2026-08-05 | CuNex GmbH | Composition for forming a copper-containing interlayer comprising internal pores |
| EP4688306B1 (en) * | 2023-05-08 | 2026-08-12 | CuNex GmbH | Composition for forming a copper-containing interlayer |
Also Published As
| Publication number | Publication date |
|---|---|
| US20230241671A1 (en) | 2023-08-03 |
| EP4197675A4 (en) | 2024-07-10 |
| JP7080950B2 (ja) | 2022-06-06 |
| JP2022065269A (ja) | 2022-04-27 |
| CN116348222A (zh) | 2023-06-27 |
| KR20230037636A (ko) | 2023-03-16 |
| EP4197675A1 (en) | 2023-06-21 |
| US12377461B2 (en) | 2025-08-05 |
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