<PLENARY SESSION>Outgassing of Hydrogen from Metal Wall

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概要

• 論文の詳細を見る

• Outgassing of hydrogen gas from metal wall is controlled either by bulk diffusion rate or by surface recombination rate. In this respect, the recombination coefficient k_R for hydrogen on metallic material is essentially important in evaluating hydrogen outgassing, but, so far, its database has been rather poor. In the present study, the k_R was evaluated for such metals as stainless steel, vanadium and nickel from experimental data of permeation rate of ion- and gas-driven hydrogen isotopes. The measured values of k_R were found to decrease with increasing the surface concentration of certain impurity elements; oxygen for stainless steel, sulfur for both vanadium and nickel as was determined by Auger electron spectroscopy. They were also compared to theoretical models and the role of surface impurities on the hydrogen recombination process was discussed mainly in terms of the activation energy of hydrogen chemisorption.

• 核融合科学研究所の論文

著者

• Yamawaki Michio

  Nuclear Engineering Research Laboratory Faculty Of Engineering University Of Tokyo

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