Paper Title:
Influence of Temperature and Oxygen Pressure on the Oxidation Process for Preparing Tritium Permeation Barrier
  Abstract

In ITER D-T fuel will be used for fusion plasma. Therefore a material capable of acting as a tritium permeation barrier on stainless steel is required. It is well known that thin alumina layer can reduce the tritium permeation rate by several orders of magnitude. A technology is introduced here to form a ductile Fe/Al layer on the steel with an alumina over-layer, which consists of two main steps, hot-dip aluminizing (HDA) and subsequent oxidation process. According to the experiments that have been done, Fe-Al intermetallic layer and outer aluminum coat were formed after the HDA process. In this report, we have studied the influence of temperature and oxygen pressure on the formation of ductile phases and alumina over-layer in the oxidation treatment. At the temperature of 900°C, the brittle Fe-Al intermetallic layer and aluminum coat transformed into ductile phase (FeAl and α-Fe(Al)) and a γ-Al2O3 over-layer was formed under the oxygen pressure about 5Pa. It was found that the low pressure of environment suppressed the formation of pores or cracks as well.

  Info
Periodical
Advanced Materials Research (Volumes 189-193)
Edited by
Zhengyi Jiang, Shanqing Li, Jianmin Zeng, Xiaoping Liao and Daoguo Yang
Pages
447-450
DOI
10.4028/www.scientific.net/AMR.189-193.447
Citation
S. L. Han, P. Y. Lee, B. L. Hou, S. M. Wang, C. J. Pan, Z. C. Sun, "Influence of Temperature and Oxygen Pressure on the Oxidation Process for Preparing Tritium Permeation Barrier", Advanced Materials Research, Vols. 189-193, pp. 447-450, 2011
Online since
February 2011
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Price
$32.00
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