Damage process of high purity tungsten coatings by hydrogen beam heat loads

S. Tamura; K. Tokunaga; N. Yoshida; M. Taniguchi; K. Ezato; K. Sato; S. Suzuki; M. Akiba; Y. Tsunekawa; M. Okumiya

doi:10.1016/j.jnucmat.2004.10.103

Damage process of high purity tungsten coatings by hydrogen beam heat loads

S. Tamura, K. Tokunaga, N. Yoshida, M. Taniguchi, K. Ezato, K. Sato, S. Suzuki, M. Akiba, Y. Tsunekawa, M. Okumiya

Division of Nuclear Fusion Dynamics

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

12 Citations (Scopus)

Abstract

To investigate the synergistic effects of heat load and hydrogen irradiation, cyclic heat load tests with a hydrogen beam and a comparable electron beam were performed for high purity CVD-tungsten coatings. Surface modification was examined as a function of the peak temperature by changing the heat flux. Scanning Electron Microscopy analysis showed that the surface damage caused by the hydrogen beam was more severe than that by the electron beam. In the hydrogen beam case, cracking at the surface occurred at all peak temperatures examined from 300 °C to 1600 °C. These results indicate that the injected hydrogen induces embrittlement for the CVD-tungsten coating.

Original language	English
Pages (from-to)	1043-1047
Number of pages	5
Journal	Journal of Nuclear Materials
Volume	337-339
Issue number	1-3 SPEC. ISS.
DOIs	https://doi.org/10.1016/j.jnucmat.2004.10.103
Publication status	Published - Mar 1 2005

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Materials Science(all)
Nuclear Energy and Engineering

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10.1016/j.jnucmat.2004.10.103

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title = "Damage process of high purity tungsten coatings by hydrogen beam heat loads",

abstract = "To investigate the synergistic effects of heat load and hydrogen irradiation, cyclic heat load tests with a hydrogen beam and a comparable electron beam were performed for high purity CVD-tungsten coatings. Surface modification was examined as a function of the peak temperature by changing the heat flux. Scanning Electron Microscopy analysis showed that the surface damage caused by the hydrogen beam was more severe than that by the electron beam. In the hydrogen beam case, cracking at the surface occurred at all peak temperatures examined from 300 °C to 1600 °C. These results indicate that the injected hydrogen induces embrittlement for the CVD-tungsten coating.",

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T1 - Damage process of high purity tungsten coatings by hydrogen beam heat loads

AU - Tamura, S.

AU - Tokunaga, K.

AU - Yoshida, N.

AU - Taniguchi, M.

AU - Ezato, K.

AU - Sato, K.

AU - Suzuki, S.

AU - Akiba, M.

AU - Tsunekawa, Y.

AU - Okumiya, M.

PY - 2005/3/1

Y1 - 2005/3/1

N2 - To investigate the synergistic effects of heat load and hydrogen irradiation, cyclic heat load tests with a hydrogen beam and a comparable electron beam were performed for high purity CVD-tungsten coatings. Surface modification was examined as a function of the peak temperature by changing the heat flux. Scanning Electron Microscopy analysis showed that the surface damage caused by the hydrogen beam was more severe than that by the electron beam. In the hydrogen beam case, cracking at the surface occurred at all peak temperatures examined from 300 °C to 1600 °C. These results indicate that the injected hydrogen induces embrittlement for the CVD-tungsten coating.

AB - To investigate the synergistic effects of heat load and hydrogen irradiation, cyclic heat load tests with a hydrogen beam and a comparable electron beam were performed for high purity CVD-tungsten coatings. Surface modification was examined as a function of the peak temperature by changing the heat flux. Scanning Electron Microscopy analysis showed that the surface damage caused by the hydrogen beam was more severe than that by the electron beam. In the hydrogen beam case, cracking at the surface occurred at all peak temperatures examined from 300 °C to 1600 °C. These results indicate that the injected hydrogen induces embrittlement for the CVD-tungsten coating.

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JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - 1-3 SPEC. ISS.

ER -

Damage process of high purity tungsten coatings by hydrogen beam heat loads

Abstract

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