In this paper, recent progress in the development of low activation vanadium alloys and MHD insulator coatings for Li-self cooled blanket is overviewed. The research progress in vanadium alloys is highlighted by technology of fabricating creep tubes, comparison of thermal creep in vacuum and Li, understanding on impurity transfer between vanadium alloys and Li and its impact on mechanical properties, behavior of hydrogen and hydrogen isotopes, low dose irradiation effects on weld joints and exploration for advanced vanadium alloys. Major remaining issues of vanadium alloys are thermal and irradiation creep, helium effects on high temperature mechanical properties and radiation effects on low temperature fracture properties. A new promising candidate of Er2O3, which showed good compatibility with Li, was identified for MHD insulator coating on vanadium alloys. The coating technology has made a significant progressed for the new candidate material. Recent efforts are being focused on multi-layer coating and in-situ coating. Tests in flowing lithium conditions with temperature gradient are necessary for quantitative examination of the performance.
Revised: November 6, 2007 |
Published: August 1, 2007
Citation
Muroga T., J.M. Chen, V.M. Chernov, K. Fukumoto, D.T. Hoelzer, R.J. Kurtz, and T. Nagasaka, et al. 2007.Review of Advances in Development of Vanadium Alloys and MHD Insulator Coatings. In Proceedings of the Twelfth International Conference on Fusion Reactor Materials (ICFRM-12), Published in Journal of Nuclear Materials, 367-376, Part 1, 780-787. Amsterdam:Elsevier.PNNL-SA-52984.doi:10.1016/j.jnucmat.2007.03.082