WO2015019959A1 - 複合銅粒子及びその製造方法 - Google Patents
複合銅粒子及びその製造方法 Download PDFInfo
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- WO2015019959A1 WO2015019959A1 PCT/JP2014/070346 JP2014070346W WO2015019959A1 WO 2015019959 A1 WO2015019959 A1 WO 2015019959A1 JP 2014070346 W JP2014070346 W JP 2014070346W WO 2015019959 A1 WO2015019959 A1 WO 2015019959A1
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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
- 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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- 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
- B22F1/16—Metallic particles coated with a non-metal
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/01—Alloys based on copper with aluminium as the next major constituent
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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
- H01B1/14—Conductive material dispersed in non-conductive inorganic material
- H01B1/16—Conductive material dispersed in non-conductive inorganic material the conductive material comprising metals or alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
Definitions
- the present invention relates to composite copper particles and a method for producing the same.
- the flaky copper particles have a large specific surface area due to their flat shape and a large contact area between the particles, so that the electrical conductivity can be improved by adding them to the conductive composition. , And has the advantage that the viscosity can be adjusted.
- the present applicant has previously proposed a flake copper powder and a conductive paste containing the same (see Patent Document 1).
- flaky copper powder are listed values of D 90 / D 10 is the ratio of the weight-cumulative particle diameter D 90 and the weight cumulative particle diameter D 10 of 4.0 or less.
- the same document also discloses a flake copper powder having a particle size of 10 ⁇ m or less, an SD / D 50 value of 0.15 to 0.35, and an aspect ratio ([thickness] / [D 50 ]). Flakes copper powder with a value of 0.3 to 0.7 is described. According to the flake copper powder described in the document having such a configuration, a fine pattern circuit can be formed.
- an object of the present invention is to provide a composite copper particle and a method for producing the same that can eliminate the various disadvantages of the above-described conventional technology.
- the present invention is a composite of flat copper particles and a plurality of finer inorganic oxide particles than the flat copper particles,
- the present invention provides composite copper particles in which the inorganic oxide particles are unevenly distributed on the surface of the flat copper particles.
- the present invention is to disperse a mixed powder of a spherical raw material copper powder and an inorganic oxide powder using beads, to flatly plastically deform the copper particles of the raw material copper powder,
- a method for producing composite copper particles in which particles of the inorganic oxide are disposed on a surface As the inorganic oxide powder, the ratio between the volume cumulative particle diameter D 50 (nm) at a cumulative volume of 50 vol% by the dynamic light scattering particle size distribution measurement method and the particle diameter D BET converted from the BET specific surface area.
- a method for producing composite copper particles using a material having a D 50 / D BET of 60 or more is provided.
- FIG. 1 is an image showing the result of elemental mapping of copper on the composite copper particles obtained in Example 1.
- FIG. 2 is an image showing the result of elemental mapping of zirconium for the composite copper particles obtained in Example 1.
- FIG. 3 is an image showing the result of elemental mapping of aluminum on the composite copper particles obtained in Example 1.
- FIG. 4 is a graph showing thermomechanical analysis measurement results for the copper particles obtained in Examples 1 to 3 and Comparative Examples 1 and 2.
- the composite copper particles of the present invention are composed of a composite of copper particles as a base material and a plurality of inorganic oxide particles.
- the copper particles as the base material are flat copper particles having a flat shape.
- the inorganic oxide particles combined with the base material are finer than the flat copper particles that are the base material.
- the composite copper particles of the present invention have one of the characteristics in the composite state of inorganic oxide particles with flat copper particles as a base material. Specifically, the inorganic oxide particles are unevenly distributed on the surface of the flat copper particles. “Unevenly distributed on the surface” means that the inorganic oxide particles are not uniformly distributed over the entire surface of the flat copper particles, and the inorganic oxide particles are distributed unevenly on a part of the surface. Say that. That is, the surface of the flat copper particles is a region where inorganic oxide particles are present, and a region where inorganic oxide particles are not substantially present. And an existing area. The fact that the inorganic oxide particles are unevenly distributed on the surface of the flat copper particles has the following advantages.
- the inorganic oxide particles when preparing a conductive composition such as a conductive paste using the composite copper particles of the present invention, and firing a coating film of the conductive composition to form an electronic circuit or the like, the inorganic oxide particles If the surface of the flat copper particles is unevenly distributed, the inorganic oxide particle existing region which is the unevenly distributed portion is less likely to be bonded to each other than the inorganic oxide particle non-existing region.
- the site where the bonding is difficult to occur acts as a passage for gas generated during firing. As a result, swelling of the electrode that may occur during firing is effectively prevented.
- an increase in electrical resistance of an electronic circuit or the like formed using the composite copper particles of the present invention can be suppressed, and surface smoothness can be improved.
- the fact that the inorganic oxide particles are unevenly distributed means that the composite copper particles of the present invention are UMT processed to form a cross section as shown in FIGS. 1 to 3 described later, and element mapping is performed on the cross section.
- it means that an inorganic oxide particle existing region and an inorganic oxide particle non-existing region are observed around the composite copper particle.
- the inorganic oxide particle existing region is observed over the entire region around the composite copper particle, or conversely, when the inorganic oxide particle non-existing region is observed over the entire region around the composite copper particle, It does not correspond to “inorganic oxide particles are unevenly distributed”.
- a plurality of inorganic oxide particles aggregate to form an aggregate, which is an effective prevention of electrode continuity.
- the inorganic oxide particles are arranged on the surface of the flat copper particles by an anchor effect generated by, for example, part of the inorganic oxide particles being embedded in the surface of the flat copper particles. Or the inorganic oxide particle is arrange
- the composite copper particles of the present invention may be manufactured according to the manufacturing method described later.
- the proportion of the inorganic oxide particles in the composite copper particles of the present invention is 0.001 mass. % To 5.0% by mass, more preferably 0.01% to 3.0% by mass, and even more preferably 0.01% to 2.0% by mass. preferable.
- the ratio of the inorganic oxide particles can be measured by, for example, an inductively coupled plasma optical emission spectrometer (ICP-AES).
- the inorganic oxide particles only need to be present on the surface of the flat copper particles, and may not be present inside the flat copper particles. However, the presence of the inorganic oxide particles inside the flat copper particles is not hindered. From the viewpoint of prominent effects exhibited when the inorganic oxide particles are unevenly distributed on the surface of the flat copper particles, the proportion of the inorganic oxide particles present in the flat copper particles is smaller. preferable. From this viewpoint, the proportion of the inorganic oxide particles present in the flat copper particles among the inorganic oxide particles contained in the composite copper particles of the present invention is preferably 1.0% by mass or less. More preferably, it is 0.7 mass% or less. This ratio can be measured, for example, by element mapping for the cross section of the composite copper particle of the present invention.
- the “inorganic oxide particles present inside the flat copper particles” are inorganic oxide particles that are not exposed at all on the surface of the composite copper particles of the present invention.
- the composite copper particles of the present invention have a flat shape reflecting the shape of the flat copper particles that are the base material.
- the flatness of the composite copper particles of the present invention is preferably 5 or more and 30 or less, preferably 5 or more and 25 or less, when expressed by an aspect ratio that is d / t, which is the ratio of the major axis d to the thickness t of the plate surface. More preferably, it is 7 or more and 20 or less. Since the composite copper particles of the present invention have such a flatness, the electronic circuit or the like formed from the composite copper particles of the present invention has high density, and an increase in electrical resistance is effective. To be suppressed.
- the major axis d and thickness t of the plate surface of the particles are measured by observation with an electron microscope. Specifically, after taking a photograph of the particles using a scanning electron microscope (SEM), the particle diameter is calculated from the ratio between the major axis d and the thickness t of the plate surface of the particles in the photograph.
- SEM scanning electron microscope
- the composite copper particles of the present invention are preferably fine particles.
- the composite copper particles of the present invention preferably has a volume cumulative particle diameter D 50 in the cumulative volume of 50 vol% is 0.1 ⁇ m or more 10 ⁇ m or less by a laser diffraction scattering particle size distribution measuring method, 0.2 [mu] m or more It is more preferable that it is 9.0 micrometers or less, and it is still more preferable that they are 0.3 micrometer or more and 7.0 micrometers or less.
- Copper particles generally tend to have a lower sintering start temperature as the particle size decreases. This tendency also applies to the composite copper particles of the present invention. However, depending on the specific application of the composite copper particles of the present invention, a decrease in the sintering start temperature may not be desirable. In this regard, in the composite copper particles of the present invention, a decrease in the sintering start temperature is suppressed due to the presence of inorganic oxide particles on the surface of the flat copper particles that are the base material. . In other words, despite the fact that the composite copper particles of the present invention are fine, they can maintain a sintering start temperature comparable to the sintering start temperature of conventionally used copper powder.
- the composite copper particles of the present invention preferably have a wide particle size distribution.
- the composite copper particles of the present invention having a flat shape have a wide particle size distribution, the electronic circuit or the like formed from the composite copper particles of the present invention has high density. As a result, there is an advantageous effect that an increase in electrical resistance is effectively suppressed.
- this value is 3 It is preferably 10 or less, more preferably 3 or more and 9 or less, and still more preferably 3 or more and 8 or less.
- the conditions for flattening the raw material copper powder are as follows. Appropriately set.
- the size of the flat copper particles that are the base material constituting the composite copper particles of the present invention is the same as the size of the composite copper particles of the present invention described above.
- the size of the inorganic oxide particles is 1 nm to 500 nm in terms of the particle size converted from the BET specific surface area (hereinafter also referred to as “BET converted particle size”) on condition that the particles are finer than the flat copper particles. Or less, preferably 1 nm or more and 400 nm or less, and more preferably 1 nm or more and 300 nm or less.
- the measurement of the BET specific surface area for obtaining the BET equivalent particle diameter of the inorganic oxide particles is performed as follows, for example. That is, the measurement is performed using a gas adsorption method in which the specific surface area is calculated from the amount of gas adsorbed on the surface.
- a specific measuring apparatus for example, a mono soap manufactured by Yuasa Ionics can be used.
- the inorganic oxide particles it is possible to use those having a hardness higher than copper, and in the preferred method for producing the composite copper particles of the present invention described later, the inorganic oxide particles are arranged on the surface of the flat copper particles. It is preferable from the viewpoint of easy. Hardness refers to the hardness of a material measured using a Mohs hardness meter.
- preferable materials as the inorganic oxide particles are, for example, alumina, zirconia, silica, barium titanate, yttrium oxide, zinc oxide and the like. These substances can be used alone or in combination of two or more.
- the flat copper particles combined with the inorganic oxide particles may be composed only of copper, or in addition to copper, other metal elements or metalloid elements (hereinafter collectively referred to as “ It may be configured to include a “metal element”.
- the metal elements for example, materials such as aluminum, zirconium, yttrium, and silicon that exhibit a different sintering behavior from copper can be used. These metal elements can be used individually by 1 type or in combination of 2 or more types.
- the flat copper particles contain other metal elements, there is an advantageous effect that the sintering behavior of copper can be controlled.
- Other metal elements contained in the flat copper particles may be present in the form of a simple metal, or may be present in an alloy state with copper or a compound of metal elements (for example, an oxide). Good. From the viewpoint of making the above-described effects exhibited by adding other metal elements more remarkable, the other metal elements are contained in the flat copper particles in the state of a compound of a metal element such as an oxide. Preferably it is.
- metal elements may be present uniformly in the flat copper particles, or may be unevenly distributed in specific parts. As a result of the study by the inventors, it has been found that other metal elements are preferably unevenly distributed on the surface of the flat copper particles. The inventor believes that this is because the vicinity of the surface tends to affect the sintering behavior.
- the metal elements are preferably present almost uniformly over the entire surface of the flat copper particles. Due to the presence of such a state, the sintering behavior during firing can be easily controlled, and coupled with the use of flat copper particles having a wide range of particle sizes, This is preferable because it facilitates design.
- the content ratio of the other metal elements is preferably 0.001% by mass or more and 5.0% by mass or less, and 0.01% by mass or more and 3.0% by mass with respect to the mass of copper in the flat copper particles of the present invention. % Or less, more preferably 0.05% by mass or more and 1.0% by mass or less.
- a mixed powder of a spherical raw material copper powder and an inorganic oxide powder is dispersed using beads.
- the copper particles of the raw material copper powder are flatly plastically deformed, and the inorganic oxide particles are arranged on the surfaces of the copper particles.
- What is important at this time is to use an inorganic oxide powder having a high degree of aggregation.
- the inorganic oxide particles can be unevenly distributed when the spherical raw material copper powder and the inorganic oxide powder are combined.
- a volume cumulative particle diameter D 50 (nm) at a cumulative volume of 50 vol% by a dynamic light scattering particle size distribution measurement method and a particle diameter D BET converted from a BET specific surface area are used as an inorganic oxide powder. It is advantageous to use those having a D 50 / D BET of 60 or more.
- D 50 / D BET is an index representing the degree of aggregation of the powder, and the larger the value, the higher the degree of aggregation of the powder. Then, by using an inorganic oxide powder having a D 50 / D BET of 60 or more, the aggregation state is reflected in the composite copper particles as the target product, and the inorganic oxide particles are unevenly distributed in a flat shape. It will be arranged on the surface of the copper particles.
- the value of D 50 / D BET is large, but if this value is excessively large, the spherical raw material copper powder and the inorganic oxide It tends to be difficult to mix with the powder.
- the value of D 50 / D BET is preferably 60 or more and 300 or less, and more preferably 60 or more and 100 or less.
- the diameter of the beads is preferably 0.005 mm to 1.0 mm, more preferably 0.05 mm to 0 mm. 0.5 mm or less, more preferably 0.05 mm or more and 0.3 mm or less is used.
- the material of the beads only needs to be higher than that of copper and inorganic oxide particles. For example, alumina, zirconia, silica, or the like is preferably used.
- the amount of the beads used is preferably 50% by mass or more and 90% by mass or less, more preferably 60% by mass or more and 85% by mass or less, and still more preferably 65% by mass or more and 85% with respect to the capacity of the processing machine to be processed. It is below mass%.
- a bead mill can be used for the dispersion treatment using beads.
- the time required for dispersion treatment depends on the capacity of the processing machine, but generally when using a bead mill with a capacity of 0.1L or more and 300L or less, 5 minutes or more and 90 minutes for 1 kg of copper powder. It is preferable to set it as follows, and it is more preferable to set it as 10 minutes or more and 70 minutes or less.
- the inorganic oxide particles have no change in the particle size (primary particle size) before and after being combined with the flat copper powder. Therefore, the particle size of the inorganic oxide powder used as a raw material is the same as the particle size of the inorganic oxide particles contained in the composite copper particles of the present invention. On the other hand, since the raw material copper powder used as a raw material is flattened by a dispersion process using beads, the shape and dimensions change before and after the composite.
- the raw material of copper powder is made of an aggregate of copper particles spherical, 8 [mu] m volume cumulative particle diameter D 50 in the cumulative volume 50% by volume or more 0.03 ⁇ m by a laser diffraction scattering particle size distribution measurement method
- copper particles of shapes other than spherical as raw material copper powder, in that case, it may be difficult to obtain composite copper particles having a desired flat shape.
- Spherical copper particles are advantageous because they are easier to manufacture than other shapes of copper particles.
- the raw material copper powder preferably has a high degree of aggregation. Thereby, the degree of aggregation of the obtained composite copper particles can be increased.
- the value of D max / D 50 which is the ratio of the maximum particle diameter D max and D 50 according to the measured laser diffraction scattering particle size distribution measurement method for the raw material of copper powder, it is 2 to 15 Preferably, it is 3 or more and 13 or less, more preferably 3 or more and 10 or less.
- the raw material copper powder having such a particle size distribution may be set appropriately in conditions for producing the raw material copper powder by a dry method such as atomization or wet reduction. Or it can obtain by mixing or classifying the copper powder manufactured by these methods.
- the target composite copper particles contain a metal element other than copper
- an aluminum element is used as another metal element
- the following method can be employed.
- aluminum is mixed in a molten copper melt.
- aluminum oxide such as alumina is added during the reduction of copper.
- the aluminum element is mainly present at a position near the surface in the particle.
- target composite copper particles By performing the dispersion treatment as described above, target composite copper particles can be obtained.
- the composite copper particles thus obtained are used in the form of a conductive composition containing the composite copper particles.
- This conductive paste contains, for example, the composite copper particles of the present invention, an organic vehicle, and glass frit.
- This organic vehicle includes a resin component and a solvent.
- the resin component include acrylic resin, epoxy resin, ethyl cellulose, carboxyethyl cellulose, and the like.
- the solvent include terpene solvents such as terpineol and dihydroterpineol, and ether solvents such as ethyl carbitol and butyl carbitol.
- the glass frit examples include borosilicate glass, borosilicate barium glass, and borosilicate zinc glass.
- the proportion of the fine particle aggregate in the conductive paste is preferably 36 to 97.5% by mass.
- the glass frit ratio is preferably 1.5 to 14% by mass.
- the proportion of the organic vehicle is preferably 1 to 50% by mass.
- the conductive component in the conductive paste only the composite copper particles of the present invention may be used, or the fine particle aggregate and other copper fine particles may be used in combination. By using the composite copper particles of the present invention in combination with other copper fine particles, it becomes easy to adjust the viscosity of the paste more precisely.
- Example 1 (1) Preparation of raw material copper powder CB-3000 manufactured by Mitsui Kinzoku Mining Co., Ltd. was used as the raw material copper powder. This raw material copper powder had a value of D max / D 50 of 3.5 and D 50 of 3.2 ⁇ m. D 50 and D max were measured using a Nikkiso Microtrack X-100. This raw material copper powder contained 0.25% of aluminum. Aluminum was present on the inner surface in the particles in a simple state.
- inorganic oxide powder Zirconia powder was used as the inorganic oxide powder. This powder had a D 50 / D BET value of 70 and a BET equivalent particle size D BET of 15 nm. D 50 was measured using a Malvern Instruments Co., Ltd. Zetasizer ZS. The D BET was measured using a monosoap manufactured by Yuasa Ionics.
- the composite copper powder For the obtained composite copper powder, a cross section was cut out by UMT (Ultramicrotome) processing, and element mapping was performed on the cross section by STEM (Scanning Transmission Electron Microscopy) -EDS (Energy Dispersive Spectroscopy).
- the mapped elements are copper, zirconium and aluminum.
- FIGS. As is clear from these figures, it can be seen that the composite copper particles have a flat shape, and zirconia particles are unevenly distributed on the surface thereof. In particular, it can be seen that a plurality of zirconia particles aggregate to form an aggregate. Moreover, in the flat copper particle
- Example 2 instead of the zirconia powder used in Example 1, alumina powder was used. This powder had a D 50 / D BET value of 60 and a BET equivalent particle size D BET of 10 nm. Except this, it carried out similarly to Example 1, and obtained the composite copper particle. It was 0.5% when the ratio of the inorganic oxide particle to a composite copper particle was measured by the method mentioned above.
- Example 3 instead of the raw material copper powder used in Example 1, a raw material copper powder having a value of D max / D 50 of 2.5 and D 50 of 3.3 ⁇ m was used. This raw material copper powder contained 0.13% of aluminum element. The aluminum element was present on the inner surface in the particles. Except this, it carried out similarly to Example 2, and obtained the composite copper particle. It was 0.5% when the ratio of the inorganic oxide particle to a composite copper particle was measured by the method mentioned above.
- Example 1 In Example 1, a bead mill treatment was performed without using zirconia powder. Except this, flat copper particles were obtained in the same manner as in Example 1.
- Example 3 a bead mill treatment was performed without using alumina powder. Except this, flat copper particles were obtained in the same manner as in Example 3.
- thermomechanical analysis (TMA) measurement was performed.
- TMA thermomechanical analysis
- SS6300 manufactured by Seiko Instruments Inc.
- the atmosphere was nitrogen, and the measurement was performed at a heating rate of 10 ° C./min.
- the result is shown in FIG.
- the composite copper particles obtained in each example have the same heat shrinkage start temperature, that is, the sintering start temperature, compared to the copper particles obtained in the comparative examples, or It turns out that it is higher.
- Conductive paste was prepared using the copper particles obtained in the examples and comparative examples as raw materials.
- the conductive paste had a copper particle ratio of 70%, a terpineol ratio of 25%, and an ethyl cellulose ratio of 5%.
- This conductive paste was applied to the surface of the alumina substrate using an applicator to form a coating film having a thickness of 20 ⁇ m.
- This coating film was baked at 800 ° C. for 1 hour in a nitrogen atmosphere.
- the surface state of the conductive film obtained by firing was visually observed to evaluate the continuity of the electrodes.
- the case where there was continuity of the electrode was evaluated as “ ⁇ ”, and the case where there was no continuity was evaluated as “x”.
- the results are shown in Table 1 below. As is clear from the results shown in the table, when using the copper particles obtained in the examples, discontinuities such as swelling of the electrodes were not observed, whereas the copper particles obtained in the comparative example were When used, electrode swelling was observed.
- the composite copper particle which can manufacture easily the electrode by which generation
Abstract
Description
前記無機酸化物粒子が、前記扁平状銅粒子の表面において偏在している複合銅粒子を提供するものである。
前記無機酸化物の粉体として、動的光散乱式粒度分布測定法による累積体積50容量%における体積累積粒径D50(nm)と、BET比表面積から換算された粒径DBETとの比であるD50/DBETが60以上であるものを用いた、複合銅粒子の製造方法を提供するものである。
(1)原料銅粉の準備
原料銅粉として三井金属鉱業社製のCB-3000を用いた。この原料銅粉は、Dmax/D50の値が3.5であり、D50が3.2μmであった。D50及びDmaxは、日機装社製マイクロトラックX-100を用いて測定した。この原料銅粉は、アルミニウムを0.25%含むものであった。アルミニウムは単体の状態で、粒子中の内表面に存在していた。
無機酸化物の粉体としてジルコニアの粉体を用いた。この粉体は、D50/DBETの値が70であり、BET換算粒径DBETが15nmであった。D50はマルバーン社製ゼータサイザーZSを用いて測定した。DBETは、ユアサアイオニクス社製のモノソープを用いて測定した。
原料銅粉1000gと無機酸化物の粉体100gとをビーズミルに投入して混合して混合粉となし、更に直径0.2mmであるジルコニア製のビーズも投入して分散処理を行った。ビーズの量は、処理機の容量に対して70%とした。ビーズミルの容積は2Lであり、分散処理時間は20分間とした。これによって、目的とする複合銅粒子を得た。上述した方法で複合銅粒子に占める無機酸化物粒子の割合を測定したところ0.5%であった。
実施例1で用いたジルコニアの粉体に代えて、アルミナの粉体を用いた。この粉体は、D50/DBETの値が60であり、BET換算粒径DBETが10nmであった。これ以外は実施例1と同様にして複合銅粒子を得た。上述した方法で複合銅粒子に占める無機酸化物粒子の割合を測定したところ0.5%であった。
実施例1で用いた原料銅粉に代えて、Dmax/D50の値が2.5であり、D50が3.3μmである原料銅粉を用いた。この原料銅粉は、アルミニウム元素を0.13%含むものであった。アルミニウム元素は、粒子中の内表面に存在していた。これ以外は実施例2と同様にして複合銅粒子を得た。上述した方法で複合銅粒子に占める無機酸化物粒子の割合を測定したところ0.5%であった。
実施例1においてジルコニアの粉体を用いずにビーズミルの処理を行った。これ以外は実施例1と同様にして扁平状銅粒子を得た。
実施例3においてアルミナの粉体を用いずにビーズミルの処理を行った。これ以外は実施例3と同様にして扁平状銅粒子を得た。
実施例及び比較例で得られた銅粒子について、熱機械分析(TMA)測定を行った。測定装置としてセイコーインスツルメンツ社製TMA/SS6300を用いた。雰囲気は窒素とし、昇温速度10℃/minで測定を行った。その結果を図4に示す。同図に示す結果から明らかなとおり、各実施例で得られた複合銅粒子は、比較例で得られた銅粒子に比べて、熱収縮開始温度、つまり焼結開始温度が同等であるか又はそれよりも高いことが判る。
実施例及び比較例で得られた銅粒子を原料として用いて導電性ペーストを調製した。導電性ペーストは、銅粒子の割合が70%、ターピネオールの割合が25%、エチルセルロースの割合が5%であった。この導電性ペーストを、アルミナ基盤の表面にアプリケーターを用いて塗布して膜厚20μmの塗膜を形成した。この塗膜を、窒素雰囲気下に、800℃で1時間にわたって焼成した。焼成によって得られた導電膜の表面状態を目視によって観察し、電極の連続性を評価した。電極の連続性がある場合を「○」とし、連続性がない場合を「×」と評価した。その結果を以下の表1に示す。同表に示す結果から明らかなとおり、実施例で得られた銅粒子を用いた場合には電極の膨れ等の不連続性は観察されなかったのに対し、比較例で得られた銅粒子を用いた場合には、電極の膨れが観察された。
Claims (10)
- 扁平状銅粒子と該扁平状銅粒子よりも微粒の複数の無機酸化物粒子とが複合化されてなり、
前記無機酸化物粒子が、前記扁平状銅粒子の表面において偏在している複合銅粒子。 - レーザー回折散乱式粒度分布測定法による累積体積50体積%における体積累積粒径D50が0.1μm以上10μm以下である請求項1に記載の複合銅粒子。
- 板面の長径dと厚みtの比であるd/tで表されるアスペクト比が5以上30以下である請求項1又は2に記載の複合銅粒子。
- 前記無機酸化物粒子は、BET比表面積から換算された粒径が1nm以上500nm以下である請求項1ないし3のいずれか一項に記載の複合銅粒子。
- レーザー回折散乱式粒度分布測定法による最大粒径DmaxとD50との比であるDmax/D50の値が3以上10以下である請求項1ないし4のいずれか一項に記載の複合銅粒子。
- 前記無機酸化物が、銅よりも高硬度である請求項1ないし5のいずれか一項に記載の複合銅粒子。
- 請求項1ないし6のいずれか一項に記載の複合銅粒子を含む導電性組成物。
- 球状の原料銅粉と無機酸化物の粉体との混合粉を、ビーズを用いて分散処理し、該原料銅粉の銅粒子を扁平に塑性変形させるとともに、該銅粒子の表面に該無機酸化物の粒子を配置する複合銅粒子の製造方法であって、
前記無機酸化物の粉体として、動的光散乱式粒度分布測定法による累積体積50容量%における体積累積粒径D50(nm)と、BET比表面積から換算された粒径DBETとの比であるD50/DBETが60以上であるものを用いた、複合銅粒子の製造方法。 - 前記原料銅粉について測定されたレーザー回折散乱式粒度分布測定法による最大粒径DmaxとD50との比であるDmax/D50の値が2以上15以下である請求項8に記載の複合銅粒子の製造方法。
- 前記原料銅粉として、銅に加えて他の金属元素を含むものを用いた請求項8又は9に記載の複合銅粒子の製造方法。
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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 |
US7459007B2 (en) * | 2005-03-15 | 2008-12-02 | Clarkson University | Method for producing ultra-fine metal flakes |
JP5080731B2 (ja) * | 2005-10-03 | 2012-11-21 | 三井金属鉱業株式会社 | 微粒銀粒子付着銀銅複合粉及びその微粒銀粒子付着銀銅複合粉製造方法 |
KR20110067509A (ko) * | 2009-12-14 | 2011-06-22 | 삼성전기주식회사 | 외부전극용 도전성 페이스트 조성물, 이를 포함하는 적층 세라믹 커패시터 및 그 제조방법 |
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TW201511035A (zh) | 2015-03-16 |
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