Journal of the Ceramic Society of Japan
Online ISSN : 1348-6535
Print ISSN : 1882-0743
ISSN-L : 1348-6535
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Production and characterization of silver powder created using high-pressure water atomization
Takashi OGIHARAToshihiko KUBOShigehiro ARITANobuyoshi AOYAGIRyosuke UEYAMAMasahiro HARADAAkio HARADA
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Supplementary material

2017 Volume 125 Issue 1 Pages 19-22

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Abstract

Silver powders are important for the production of silicon solar cells and low-temperature co-fired ceramics. In this study, a silver powder was produced at a rate of 2 kg/min through water atomization with a water pressure of 80 MPa and water flow rate of 220 L/min. Scanning electron microscopy analysis showed that the silver particles produced were aggregated and had various types of morphologies such as spherical, elliptical, and irregular. The volume average particle size and its standard deviation were 8 and 4.1 µm, respectively. Powder X-ray diffraction revealed that the as-prepared silver powder had a single phase with high crystallinity. The oxygen content in the silver powder measured by electron probe micro analysis was 50 ppm. The silver powder was classified to the size of ≤2.5 µm, and the shrinkage of the silver paste was 25.5% at 900°C, comparable to that of the powder obtained by chemical reduction. Electrical measurements revealed that the specific resistivity of the silver paste sintered at 900°C for 60 min was 2.11 × 10−8 Ω m. The silver paste exhibited lower specific resistivity when the sintering temperature was high and sintering time was long.

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© 2017 The Ceramic Society of Japan
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