The effect of pyrolytic carbon coating on gas emission and sublimation of graphite induced by pulse laser beams

T. Muroga, H. Kamezaki, K. Tokunaga, N. Yoshida

研究成果: Contribution to journalArticle査読

2 被引用数 (Scopus)

抄録

The emission and sublimation of graphites coated with pyrolytic carbon (PyC) has been measured under irradiation with pulse laser beams to examine the effects of pulse heat load on the role of the coating. Under a heat load density of 640 MW/m2 and a pulse length of 1 ms, gas emission, sublimation and vacuum degradation are enhanced by the PyC coating. This is mainly due to very low thermal conductivity of the PyC film in the surface normal direction resulting in an enhanced temperature rise during the heat load. On the other hand, the gas emission, sublimation and vacuum degradation of the coated specimens were small relative to the non-coated specimens when compared on the basis of the measured peak surface temperature. Thus the surface coating with PyC may be effective in reducing the gas emission when the carbon temperature increases gradually but can be harmful to vacuum and surface stability in the case of pulse high heat load.

本文言語英語
ページ(範囲)450-454
ページ数5
ジャーナルJournal of Nuclear Materials
176-177
C
DOI
出版ステータス出版済み - 12 3 1990

All Science Journal Classification (ASJC) codes

  • 核物理学および高エネルギー物理学
  • 材料科学(全般)
  • 原子力エネルギーおよび原子力工学

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