View in EDS

Effect of sintering parameters on dehydrogenation behavior of yttrium hydride during spark plasma sintering.

Saved in:
Bibliographic Details
Title: Effect of sintering parameters on dehydrogenation behavior of yttrium hydride during spark plasma sintering.
Authors: Hou, Keke1,2,3 (AUTHOR), Shang, Xuyang1,4 (AUTHOR), Huang, He1 (AUTHOR), Yan, Chao1,2 (AUTHOR), Zhong, Yajuan1,2,3 (AUTHOR), Cao, Changqing1,2 (AUTHOR), Yu, Xiaohe1,2 (AUTHOR) yuxiaohe@sinap.ac.cn, Lin, Jun1,2,3 (AUTHOR) linjun@sinap.ac.cn
Source: International Journal of Hydrogen Energy. Jan2025, Vol. 99, p898-908. 11p.
Subjects: Geothermal reactors, Nuclear reactors, Heat capacity, Yttrium, Crystal grain boundaries
Abstract: Yttrium hydride (YH x), celebrated for its exceptional thermal stability and capacity to maintain a considerable hydrogen content even at temperatures exceeding 1143 K, is a prime candidate for serving as a moderator in high-temperature reactions in thermal nuclear reactors. This research focuses on the fabrication of yttrium hydride monoliths from hydrogenated powder, using Spark Plasma Sintering (SPS) across a range of sintering conditions. A comprehensive examination was conducted to evaluate the morphology, distribution, size, and dehydrogenation properties of the YH 2 phase, the sub-hydrogen phase, and the precipitated yttrium within YH x monoliths fabricated via this approach. The findings elucidate the dehydrogenation mechanism of yttrium hydride during the SPS process, emphasizing the crucial role of hydrogen release. This release substantially influences the size and distribution of the yttrium precipitates and modifies the surface free energy of the YH x monoliths, which in turn influences the material's defects. Consequently, this process promotes the formation of pores along the grain boundaries, which may lead to the emergence of micro-cracks. These micro-cracks accelerate the release of hydrogen from the material. [Display omitted] • YH x synthesized via SPS achieve optimal density at 1000 °C with 65 MPa. • H/Y atomic ratio diminishes above 1000 °C, impacting hydrogen retention in YH x. • SPS parameters effectively control the grain size and morphology of YH x. • Dehydrogenation is associated with alterations in size and distribution of Y. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Hydrogen Energy is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Description
Abstract:Yttrium hydride (YH x), celebrated for its exceptional thermal stability and capacity to maintain a considerable hydrogen content even at temperatures exceeding 1143 K, is a prime candidate for serving as a moderator in high-temperature reactions in thermal nuclear reactors. This research focuses on the fabrication of yttrium hydride monoliths from hydrogenated powder, using Spark Plasma Sintering (SPS) across a range of sintering conditions. A comprehensive examination was conducted to evaluate the morphology, distribution, size, and dehydrogenation properties of the YH 2 phase, the sub-hydrogen phase, and the precipitated yttrium within YH x monoliths fabricated via this approach. The findings elucidate the dehydrogenation mechanism of yttrium hydride during the SPS process, emphasizing the crucial role of hydrogen release. This release substantially influences the size and distribution of the yttrium precipitates and modifies the surface free energy of the YH x monoliths, which in turn influences the material's defects. Consequently, this process promotes the formation of pores along the grain boundaries, which may lead to the emergence of micro-cracks. These micro-cracks accelerate the release of hydrogen from the material. [Display omitted] • YH x synthesized via SPS achieve optimal density at 1000 °C with 65 MPa. • H/Y atomic ratio diminishes above 1000 °C, impacting hydrogen retention in YH x. • SPS parameters effectively control the grain size and morphology of YH x. • Dehydrogenation is associated with alterations in size and distribution of Y. [ABSTRACT FROM AUTHOR]
ISSN:03603199
DOI:10.1016/j.ijhydene.2024.12.146