Effect of Atomization Conditions on Microstructure of Ni-base Superalloy Powder

Kato, Takumi; Kusaka, Katsushi; Horata, Akira; Ichikawa, Jiro

doi:10.2355/tetsutohagane1955.71.6_719

Cited by 8 publications

(2 citation statements)

References 4 publications

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“…The fuel slugs were collected by separating the slugs from the molds. A centrifugal atomization was also used to fabricate spherical U‐Zr powder . The molten metal heated to approximately 200°C higher than the melting points was fed through a small nozzle onto a rapidly rotating graphite disk on a vertical axis.…”

Section: Methodssupporting

confidence: 65%

Microstructural characterization of U‐Zr alloy fuel slugs for sodium‐cooled fast reactor

Kim

et al. 2012

Surface & Interface Analysis

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In order to investigate a fabrication process of metallic fuel for sodium‐cooled fast reactor, U‐Zr fuel slugs were fabricated with gravity casting and injection casting. In order to reduce the formation of radioactive wastes, and to have a fine microstructure, spherical powder of U‐Zr alloy was also fabricated by centrifugal atomization. The microstructural characteristics were investigated by using electron microscopes and energy‐dispersive electron X‐ray spectroscope. U‐10wt.%Zr fuel slugs had some dispersion phases of Zr precipitates and Zr compounds of about 5 µm in size. The matrix was composed of fine laminar structure of about 0.15 µm in thickness. U grains became finer from about 30 µm in conventionally cast fuel slug to about 2 µm in atomized powder. Laminar structure became so fine from 0.2 µm in conventionally cast fuel slug to 0.1 µm in atomized powder. It is possible for atomized metallic fuel to have a fine microstructure, resulting in a higher fission gas release rate during irradiation. Copyright © 2012 John Wiley & Sons, Ltd.

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Section: Methodssupporting

confidence: 65%

Microstructural characterization of U‐Zr alloy fuel slugs for sodium‐cooled fast reactor

Kim

et al. 2012

Surface & Interface Analysis

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“…Most of the atomized particles have spherical shapes with smooth surfaces and a few attached satellites [16], while the comminuted particles have a longer and angular shape. The atomized melt-droplets are assumed to be spherical due to surface tension before they start to solidify [17]. The average surface area of atomized powders was determined to be about 30% smaller than that of comminuted powders.…”

Section: Characterization Of Atomized Nuclear Fuel Powdersmentioning

confidence: 99%

Development of advanced research reactor fuels using centrifugal atomization technology

Kim

Park

et al. 1999

Metals and Materials

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Rotating disk centrifugal atomization technology has been utilized to fabricate uranium silicide (U3Si, U3Si2) and U-Mo nuclear fuel powders having high uranium content per unit volume for high performance research reactor fuels. Atomized nuclear fuel powders have characteristics of a spherical shape with narrow size distribution, small specific surface area and high purity. The heat treatment time for the formation of U3Si by a peritectoid reaction was reduced from about 72 hours for comminuted powders to about 6 hours for atomized powders due to more rapid solidification of atomized powder with a finer microstructure. The homogeneity of fuel particles in fuel meats was improved by mixing atomized fuel powders with A1 powders using a V-shaped tumbler mixer. The atomized powders with a spherical shape and smooth surface were extruded under lower force than the comminuted powders with angular rough surfaces. The dispersed fuel meat with atomized powders resulted in an increased fuel powder loading density and higher thermal conductivity in the heat flow direction. The thermal swelling of dispersed fuel meat decreased due to the reduced specific surface area of spherical atomized nuclear powder. The atomized U-10wt.%Mo dispersion fuel showed less bubble formation than the comminuted fuel after an irradiation test with 40% bumup.

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Characterization of U-2 wt% Mo and U-10 wt% Mo alloy powders prepared by centrifugal atomization

Kim

Lee

Kim

et al. 1997

Journal of Nuclear Materials

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Effect of Atomization Conditions on Microstructure of Ni-base Superalloy Powder

Cited by 8 publications

References 4 publications

Microstructural characterization of U‐Zr alloy fuel slugs for sodium‐cooled fast reactor

Microstructural characterization of U‐Zr alloy fuel slugs for sodium‐cooled fast reactor

Development of advanced research reactor fuels using centrifugal atomization technology

Characterization of U-2 wt% Mo and U-10 wt% Mo alloy powders prepared by centrifugal atomization

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