Sintered Compact Properties of Pre-alloyed 2%Ni-Fe Water Atomized Powder

Toyoshima, Hisataka; Shimura, Tokihiro; Watanabe, Atsushi; Otsu, Hidenori

doi:10.2497/jjspm.52.437

Cited by 6 publications

(3 citation statements)

References 2 publications

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“…Oxygen content in as-prepared silver powder was 500 ppm. It was known [14,16] that metal powder derived from water atomization often exhibited high oxygen content, since the oxygen was taken from the water during the atomization. On the other hands, the carbon and silicon contents in silver particles were 410 ppm and 20 ppm, respectively.…”

Section: Powder Characterizationmentioning

confidence: 99%

“…So far, the metal powders described above have been produced by atomization under an air atmosphere. The air atmosphere led to the oxidation of metal powder during the atomization [16]. Therefore, in order to improve the particle morphology and reduce the oxygen content, we examined Radio-frequency (RF) plasma treatment of silver particle derived from water atomization.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Silver Powder Produced through Water Atomization and RF Plasma Treatment

Arita¹,

Ogihara²,

Kubo³

et al. 2017

Int J Metall Mater Eng

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Silver powder was produced through water atomization with a pressure of 80 MPa and a flow rate of 220 L/min. Scanning electron microscopy analysis showed that as-prepared silver particles were aggregated and had various types of morphologies such as spherical, spheroidal and irregular. The volume average particle size of as-prepared silver powder was 7.7 μm at the drain rate of 0.024 kg/s. The particle size decreased with decreasing the drain rate. Powder X-ray diffraction revealed that the silver powder with a single phase and high crystallinity was formed. Surface treatment of silver powders classified to 5 μm was performed at 10,000°C by radio-frequency (RF) plasma under argon atmosphere. RF plasma treatment led to the formation of spherical particles from irregular particles. The crystallinity and crystallite of silver powder were increased by RF plasma treatment. X-ray photoelectron spectroscopy showed that the oxygen content in silver particles decreased from 500 ppm to 45 ppm. Thermomechanical analysis revealed that the shrinkage of silver powder reduced by the RF plasma treatment. It was clear that the particle characterization of silver powder was significantly modified by RF plasma treatment. The specific resistivity of silver paste sintered at 900°C exhibited 1.89×10 -8 Ωm.

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Section: Powder Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of Silver Powder Produced through Water Atomization and RF Plasma Treatment

Arita¹,

Ogihara²,

Kubo³

et al. 2017

Int J Metall Mater Eng

View full text Add to dashboard Cite

show abstract

“…The air atmosphere leads to the oxidation of metal powder during the atomization. 23) We developed a water atomization apparatus in which the tundish and melting furnaces are shielded in a nitrogen atmosphere for the production of silver powder with low oxygen content. In this paper, the particle characterization and electrical properties of the silver powder produced through high pressure water atomization are described.…”

Section: Introductionmentioning

confidence: 99%

Production and characterization of silver powder created using high-pressure water atomization

Ogihara

Kubo

Arita

et al. 2017

J. Ceram. Soc. Japan

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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¯m, 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¯m, 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 ¹8 ³ m. The silver paste exhibited lower specific resistivity when the sintering temperature was high and sintering time was long.

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