VPS-タングステン被覆低放射化フェライト・マルテンサイト鋼の耐熱負荷特性改良に向けた検討

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  • Study on Improvement of Heat Load Characteristic of Tungsten Coated F82H Ferritic/Martensitic Steel
  • VPS タングステン ヒフク テイホウシャカ フェライト マルテンサイト コウ ノ タイネツフカ トクセイ カイリョウ ニ ムケタ ケントウ

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Resistance for repetitive pulse heat load and vacuum properties of F82H steel protected by plasma-sprayed W, which is being developed as advanced plasma facing armor material for fusion reactors, was experimentally examined. Microscopic observation of the sprayed W by means of EBSD and SEM revealed that deposition of large spherical particles of un-melted and/or re-solidified W ejected from the plasma gun prevent good interlayer adhesion in the sprayed W. It was experimentally shown that the number of the spherical particles will be minimized by optimizing the power of the gun and the distance between the plasma gun and the substrates. In order to reduce large retention of residual gas pre-annealing in vacuum above 450K is necessary.

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