Morphology dependent sintering path of nanocrystalline ThO2

T. Wangle; M. Beliš; V. Tyrpekl; J. Pakarinen; T. Cardinaels; T. Delloye; J. Vleugels; M. Verwerft

doi:10.1016/j.jnucmat.2020.152081

Morphology dependent sintering path of nanocrystalline ThO₂

T. Wangle^*
, M. Beliš
, V. Tyrpekl
, J. Pakarinen
, T. Cardinaels
, T. Delloye
, J. Vleugels
, M. Verwerft

^*Corresponding author for this work

Not published at VTT

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

10 Citations (Scopus)

Abstract

Thorium is most commonly precipitated as oxalate, because of the high efficiency regardless of precipitation conditions. Thorium oxalate readily decomposes into fine-grained ThO₂ during heating, but keeps the macrostructure of the oxalate platelets. To assess the effects of precipitate macrostructure on the sintering behavior, different platelet morphologies were prepared and sintered. There are two factors which influence the sintering: the presence of holes within the platelets and the size of the platelets. Small platelets or precipitates with holes generally sinter to thorium dioxide pellets of a higher density and smaller grain size.

Original language	English
Article number	152081
Journal	Journal of Nuclear Materials
Volume	533
DOIs	https://doi.org/10.1016/j.jnucmat.2020.152081
Publication status	Published - May 2020
MoE publication type	A1 Journal article-refereed

Funding

The authors would like to acknowledge Yves Heymans for polishing, Peter Dries and Koen Vanaken for assistance with dilatometry and many other technical matters. This work was partially funded by Rhodia Operations under contract CO-90-15-3832-00.

Keywords

Morphology
Sintering
Thoria
Thorium oxalate
Thorium oxide

Access to Document

10.1016/j.jnucmat.2020.152081

Cite this

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title = "Morphology dependent sintering path of nanocrystalline ThO2",

abstract = "Thorium is most commonly precipitated as oxalate, because of the high efficiency regardless of precipitation conditions. Thorium oxalate readily decomposes into fine-grained ThO2 during heating, but keeps the macrostructure of the oxalate platelets. To assess the effects of precipitate macrostructure on the sintering behavior, different platelet morphologies were prepared and sintered. There are two factors which influence the sintering: the presence of holes within the platelets and the size of the platelets. Small platelets or precipitates with holes generally sinter to thorium dioxide pellets of a higher density and smaller grain size.",

keywords = "Morphology, Sintering, Thoria, Thorium oxalate, Thorium oxide",

author = "T. Wangle and M. Beli{\v s} and V. Tyrpekl and J. Pakarinen and T. Cardinaels and T. Delloye and J. Vleugels and M. Verwerft",

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doi = "10.1016/j.jnucmat.2020.152081",

language = "English",

volume = "533",

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T1 - Morphology dependent sintering path of nanocrystalline ThO2

AU - Wangle, T.

AU - Beliš, M.

AU - Tyrpekl, V.

AU - Pakarinen, J.

AU - Cardinaels, T.

AU - Delloye, T.

AU - Vleugels, J.

AU - Verwerft, M.

PY - 2020/5

Y1 - 2020/5

N2 - Thorium is most commonly precipitated as oxalate, because of the high efficiency regardless of precipitation conditions. Thorium oxalate readily decomposes into fine-grained ThO2 during heating, but keeps the macrostructure of the oxalate platelets. To assess the effects of precipitate macrostructure on the sintering behavior, different platelet morphologies were prepared and sintered. There are two factors which influence the sintering: the presence of holes within the platelets and the size of the platelets. Small platelets or precipitates with holes generally sinter to thorium dioxide pellets of a higher density and smaller grain size.

AB - Thorium is most commonly precipitated as oxalate, because of the high efficiency regardless of precipitation conditions. Thorium oxalate readily decomposes into fine-grained ThO2 during heating, but keeps the macrostructure of the oxalate platelets. To assess the effects of precipitate macrostructure on the sintering behavior, different platelet morphologies were prepared and sintered. There are two factors which influence the sintering: the presence of holes within the platelets and the size of the platelets. Small platelets or precipitates with holes generally sinter to thorium dioxide pellets of a higher density and smaller grain size.

KW - Morphology

KW - Sintering

KW - Thoria

KW - Thorium oxalate

KW - Thorium oxide

UR - https://www.scopus.com/pages/publications/85081117726

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DO - 10.1016/j.jnucmat.2020.152081

M3 - Article

AN - SCOPUS:85081117726

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