Release and Diffusion Rate of Helium in Neutron-Irradiated SiC

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概要

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• Helium release measurements and diffusion coefficient calculations of helium in a neutron-irradiated α-SiC have been carried out in the temperature range of 750–1,260°C. The powder was obtained from SiC ceramics containing B4C, of which 10B concentration was 4.2×1016 atom/mg. Neutron irradiation was conducted up to a fluence of 2.8×1024 n/m2 (E>0.1 MeV) at ∼300°C. The diffusion coefficients were calculated for the temperature region of 750–1,060°C with time range of 0–10 min. The diffusion coefficient of helium for SiC containing B4C was D (cm2/s)=1.38×10−10exp[−0.91±0.07 (eV/atom)⁄kT]. Dissociative and interstitial diffusion mechanisms were supposed. Diffusion coefficients were reduced above ∼1,160°C probably due to accelerated migration of vacancies.

• 一般社団法人 日本原子力学会の論文
• 2004-07-25

著者

• Yano Toyohiko

  Research Laboratory For Nuclear Reactors Tokyo Institute Of Technology

• Sasaki Kazunari

  Interdisciplinary Graduate School Of Engineering Sciences Kyushu University

• PRAMONO Yudi

  Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology

• Pramono Y

  Research Laboratory For Nuclear Reactors Tokyo Institute Of Technology

• Pramono Yudi

  Research Laboratory For Nuclear Reactors Tokyo Institute Of Technology

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