STUDY OF THIN OXIDE FILMS FOR HYDROGEN BARRIERS
The management of tritium containing gases in future nuclear reactors (high temperature helium cooled reactor, fusion reactor) will necessitate the development of container materials which are impervious to tritium at the relatively high temperatures at which future plant will operate. The present project is concerned with the development of naturally grown oxide scales as hydrogen (tritium) barriers on nicke - chromium based alloys. Previous work has shown that in the case of a high temperature gas cooled reactor coupled to a steam/methane reformer, one may not rely on the formation of oxide scales which are growing in the reformer atmosphere, which consists of hydrogen, water vapour and hydrocarbons. It has however been found that using a preoxidation treatment under controlled conditions, a beneficial effect on hydrogen permeation characteristics of the film was obtained. In an oxidation test facility this preoxidation treatment is carried out under H-2/H-20 atmospheres at temperatures between 650 degrees C and 950 degrees C. Several preoxidation procedures have been developed including a standard oxidation procedure for nicke - chromium based alloys. The action of these oxide layers as barriers against hydrogen permeation is investigated in a separate permeation test facility. In the present paper the growth of thin oxide films under controlled conditions of oxidation is studied using electron spectroscopy and X-ray diffraction techniques and its structure is related to the hydrogen permeation characteristics.
Bibliographic Reference: 6TH INTERNATIONAL CONFERENCE ON THIN FILMS, STOCKHOLM (SWEDEN), AUG. 13-17, 1984 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 31744 ORA
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Record Number: 1989123006800 / Last updated on: 1987-01-01
Available languages: en