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Boron carbide (B4C) pellets have been commonly used as neutron absorber materials in fast reactor system. In this study, highly microstructure-controlled B4C ceramics with carbon nanotube (CNT) and tubal pores were fabricated, and the B4C/CNT composites were irradiated with a 30-MeV alpha beam. After irradiation, the helium gas release behavior of the alpha-implanted samples was evaluated by measuring the release of helium gas. The alpha-implanted samples with tubal pores showed the peak which would attribute to the helium gas release clearly from around 250℃ in TG-MS, whereas alpha-implanted dense sample without porosity did not show the peak clearly. It was confirmed that helium gas was released more rapidly from the B4C/CNT composites with tubal pores. The results of TG-MS and TEM suggested that helium gas can be released effectively from inside the B4C/CNT composites even with the same porosity of 5-10% as that of B4C used as neutron absorber materials in fast reactors by introducing tubal pores by highly microstructure control.

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• In Copyright
  

Keyword: boron carbide, carbon nanotube, tubal pores, helium implantation, helium gas release behavior

Date published: 2025-03-31

Publisher: The Atomic Energy Society of Japan

Journal:

• Progress in Nuclear Science and Technology (ISSN: 21854823) vol. 7 p. 207-213

Funding:

• 文部科学省 160104 (原子力システム研究開発事業)

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.15669/pnst.7.207

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Updated at: 2025-12-05 12:30:04 +0900

Published on MDR: 2025-12-05 12:23:28 +0900