Effect of O/M ratio on sintering behavior of (Pu0.3U0.7)O2-x

Shinya Nakamichi; Shun Hirooka; Masato Kato; Takeo Sunaoshi; Andrew T. Nelson; Keneth J. McClellan

doi:10.1016/j.jnucmat.2020.152188

Effect of O/M ratio on sintering behavior of (Pu_0.3U_0.7)O_2-x

Shinya Nakamichi, Shun Hirooka, Masato Kato, Takeo Sunaoshi, Andrew T. Nelson, Keneth J. McClellan

Research output: Contribution to journal › Article › peer-review

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Abstract

Sintering behaviors of (Pu_0.3U_0.7)O_2.00 and (Pu_0.3U_0.7)O_1.99 were investigated in controlled oxygen potential. Measurements of shrinkage rate were conducted with a dilatometer. The oxygen potential was adjusted to maintain the constant O/M value of the specimen during the measurements. Based on the shrinkage curves, sintering apparent activation energy was estimated by the master sintering curve method and the constant heating rate method. Microstructures of the sintered specimens were also observed using optical microscopy. The densification behavior of (Pu_0.3U_0.7)O₂ and (Pu_0.3U_0.7)O_1.99 differed considerably. The activation energy for (Pu_0.3U_0.7)O_1.99 was much higher than that for (Pu_0.3U_0.7)O_2.00. Grain growth rate of (Pu_0.3U_0.7)O_2.00 was larger than that of (Pu_0.3U_0.7)O_1.99, however, (Pu_0.3U_0.7)O_2.00 ultimately obtained a lower theoretical density than (Pu_0.3U_0.7)O_1.99.

Original language	English
Article number	152188
Journal	Journal of Nuclear Materials
Volume	535
DOIs	https://doi.org/10.1016/j.jnucmat.2020.152188
State	Published - Jul 2020
Externally published	Yes

Keywords

MOX
O/M ratio (deviation from stoichiometric composition)
sintering behavior

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10.1016/j.jnucmat.2020.152188

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title = "Effect of O/M ratio on sintering behavior of (Pu0.3U0.7)O2-x",

abstract = "Sintering behaviors of (Pu0.3U0.7)O2.00 and (Pu0.3U0.7)O1.99 were investigated in controlled oxygen potential. Measurements of shrinkage rate were conducted with a dilatometer. The oxygen potential was adjusted to maintain the constant O/M value of the specimen during the measurements. Based on the shrinkage curves, sintering apparent activation energy was estimated by the master sintering curve method and the constant heating rate method. Microstructures of the sintered specimens were also observed using optical microscopy. The densification behavior of (Pu0.3U0.7)O2 and (Pu0.3U0.7)O1.99 differed considerably. The activation energy for (Pu0.3U0.7)O1.99 was much higher than that for (Pu0.3U0.7)O2.00. Grain growth rate of (Pu0.3U0.7)O2.00 was larger than that of (Pu0.3U0.7)O1.99, however, (Pu0.3U0.7)O2.00 ultimately obtained a lower theoretical density than (Pu0.3U0.7)O1.99.",

keywords = "MOX, O/M ratio (deviation from stoichiometric composition), sintering behavior",

author = "Shinya Nakamichi and Shun Hirooka and Masato Kato and Takeo Sunaoshi and Nelson, {Andrew T.} and McClellan, {Keneth J.}",

note = "Publisher Copyright: {\textcopyright} 2020 Elsevier B.V.",

year = "2020",

month = jul,

doi = "10.1016/j.jnucmat.2020.152188",

language = "English",

volume = "535",

journal = "Journal of Nuclear Materials",

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T1 - Effect of O/M ratio on sintering behavior of (Pu0.3U0.7)O2-x

AU - Nakamichi, Shinya

AU - Hirooka, Shun

AU - Kato, Masato

AU - Sunaoshi, Takeo

AU - Nelson, Andrew T.

AU - McClellan, Keneth J.

PY - 2020/7

Y1 - 2020/7

N2 - Sintering behaviors of (Pu0.3U0.7)O2.00 and (Pu0.3U0.7)O1.99 were investigated in controlled oxygen potential. Measurements of shrinkage rate were conducted with a dilatometer. The oxygen potential was adjusted to maintain the constant O/M value of the specimen during the measurements. Based on the shrinkage curves, sintering apparent activation energy was estimated by the master sintering curve method and the constant heating rate method. Microstructures of the sintered specimens were also observed using optical microscopy. The densification behavior of (Pu0.3U0.7)O2 and (Pu0.3U0.7)O1.99 differed considerably. The activation energy for (Pu0.3U0.7)O1.99 was much higher than that for (Pu0.3U0.7)O2.00. Grain growth rate of (Pu0.3U0.7)O2.00 was larger than that of (Pu0.3U0.7)O1.99, however, (Pu0.3U0.7)O2.00 ultimately obtained a lower theoretical density than (Pu0.3U0.7)O1.99.

AB - Sintering behaviors of (Pu0.3U0.7)O2.00 and (Pu0.3U0.7)O1.99 were investigated in controlled oxygen potential. Measurements of shrinkage rate were conducted with a dilatometer. The oxygen potential was adjusted to maintain the constant O/M value of the specimen during the measurements. Based on the shrinkage curves, sintering apparent activation energy was estimated by the master sintering curve method and the constant heating rate method. Microstructures of the sintered specimens were also observed using optical microscopy. The densification behavior of (Pu0.3U0.7)O2 and (Pu0.3U0.7)O1.99 differed considerably. The activation energy for (Pu0.3U0.7)O1.99 was much higher than that for (Pu0.3U0.7)O2.00. Grain growth rate of (Pu0.3U0.7)O2.00 was larger than that of (Pu0.3U0.7)O1.99, however, (Pu0.3U0.7)O2.00 ultimately obtained a lower theoretical density than (Pu0.3U0.7)O1.99.

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KW - O/M ratio (deviation from stoichiometric composition)

KW - sintering behavior

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Effect of O/M ratio on sintering behavior of (Pu_0.3U_0.7)O_2-x

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