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Silver dust and manufacturing method thereof

A technology of silver powder and particle size distribution, which is applied in the manufacture of cables/conductors, metal/alloy conductors, conductors, etc., can solve the problems of no suppression related proposals, dispersibility, and flake production, and achieve excellent uniformity, Viscosity change suppression, the effect of suppressing the occurrence of flakes

Inactive Publication Date: 2015-06-17
SUMITOMO METAL MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] However, the purpose of this proposal is the filling of the paste in the via and high connection reliability, and no consideration is given to the dispersibility of the silver powder itself in the solvent and the generation of flakes when making the paste.
[0018] As mentioned above, although there are proposals to improve the dispersibility of silver powder in the paste, and the conductivity and reliability of the electrodes and wirings formed using the paste, there is no proposal to suppress the occurrence of flakes when the paste is produced.

Method used

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  • Silver dust and manufacturing method thereof
  • Silver dust and manufacturing method thereof
  • Silver dust and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0127] 2492 g of silver chloride (manufactured by Sumitomo Metal Mining Co., Ltd.) was thrown into 36 L of 25% ammonia water kept at 36° C. in a warm bath at 38° C. while stirring to prepare a silver complex solution. The defoamer (manufactured by ADEKA CORPORATION, Adekanol LG-126) was diluted to 100 times by volume, and 24.4ml of the defoamer dilution was added to the above-mentioned silver complex solution, and the resulting silver complex solution was The warm bath was maintained at 36°C.

[0128] On the other hand, 1068 g of ascorbic acid (manufactured by Kanto Chemical Co., Ltd., reagent, 56.9% by mass relative to silver particles) as a reducing agent was dissolved in 13.56 L of pure water at 36° C. to prepare a reducing agent solution. Next, 159.5 g of polyvinyl alcohol as a water-soluble polymer (manufactured by Kuraray Co., Ltd., PVA205, 8.5% by mass relative to silver) was dissolved in 1 L of pure water at 36°C to prepare a solution, and the solution was Mix in redu...

Embodiment 2

[0145] Silver powder was produced in the same manner as in Example 1 above except that the usage-amount of polyvinyl alcohol as a water-soluble polymer was 65.7 g (Kuraray Co., Ltd. product, PVA205, 3.5 mass % with respect to silver particles).

[0146] The obtained silver powder was evaluated in the same manner as in Example 1 above. As a result, the obtained particle size distribution was shown in Figure 4 , and the respective values ​​are shown in Table 1 below.

[0147] In addition, using the obtained silver powder, a homogeneous kneaded product was produced with a self-revolving kneader (ARE-250 type manufactured by THINKY CORPORATION), and evaluated in the same manner as in Example 1. The obtained particle size distribution is shown in Figure 5 , and the obtained values ​​are shown in Table 1 below.

[0148] Such as Figure 4 , Figure 5 As shown, the particle size distribution is in the region of 0.3μm~14.0μm, and the peak P 1 with shoulder P 2 The relationship i...

Embodiment 3

[0154] The amount of polyvinyl alcohol used as a water-soluble polymer was 262.8 g (Kuraray Co., Ltd., PVA205, 14.0% by mass relative to the silver particles), and the pulverization conditions were 5 L high-speed mixer (NIPPON COKE & ENGINEERING CO., LTD., FM5C) was stirred at a peripheral speed of 33 m / s for 30 minutes, and the silver powder was produced in the same manner as in the above-mentioned Example 1 except that it was decompressed and pulverized by a vacuum pump.

[0155] The obtained silver powder was evaluated in the same manner as in Example 1 above. As a result, the obtained particle size distribution was shown in Image 6 , and the respective values ​​are shown in Table 1 below.

[0156] In addition, using the obtained silver powder, a homogeneous kneaded product was prepared with a self-revolving kneader (ARE-250 type manufactured by THINKY CORPORATION), and evaluated in the same manner as in Example 1. The obtained particle size distribution is shown in Figu...

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Abstract

Provided are a silver dust that has a suitable viscosity range to facilitate kneading and to suppress the occurrence of flakes at the time of manufacturing a paste, and a manufacturing method thereof. According to the present invention, in a paste in which at least a silver dust, terpineol, and resin are kneaded using a self-revolution-type agitator at centrifugal force of 420 G, the particle size distribution based on volume is in the region of 0.3 µm to 14.0 µm, and in the relationship between a peak or a shoulder (P1) and a peak or a shoulder (P2), P1 > P2, P1 is in the range of 2.0 µm to 5.0 µm, and P2 is in the range of 0.5 µm to 3.0 µm.

Description

technical field [0001] The present invention relates to silver powder and a method for producing the same. More specifically, the present invention relates to silver powder as a main component of a silver paste used for forming wiring layers, electrodes, and the like of electronic devices, and a method for producing the same. [0002] This application claims priority based on Japanese Patent Application No. Japanese Patent Application No. 2011-137622 for which it applied in Japan on June 21, 2011, and these applications are referred, and are used for this application. Background technique [0003] Silver pastes such as resin-type silver pastes and calcined-type silver pastes are often used to form wiring layers, electrodes, and the like in electronic devices. That is, by applying or printing these silver pastes on various substrates, followed by heat-curing or heat-calcining, a conductive film serving as a wiring layer, an electrode, or the like can be formed. [0004] For ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/24H01B5/00H01B13/00B22F1/052B22F1/12
CPCB22F9/24H01B1/02B22F1/052B22F1/12H01B5/00H01B13/00
Inventor 冈田美香二瓶知伦川上裕二寺尾俊昭
Owner SUMITOMO METAL MINING CO LTD
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