[Table of Contents]

Plasma and Fusion Research

Volume 6, 2405117 (2011)

Regular Articles

Nitriding Treatment of Reduced Activation Ferritic Steel as Functional Layer for Liquid Breeder Blanket
Masatoshi KONDO, Takashi WATANABE1), Teruya TANAKA2), Dongxun ZHANG1) and Akio SAGARA2)
Tokai university, 4-1-1 Kitakaname, Hiratuka 259-1292, Japan
The graduate university for advanced studies, 322-6 Oroshi-cho, Toki 509-5292, Japan
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
(Received 13 December 2010 / Accepted 3 June 2011 / Published 26 August 2011)


The development of functional layers such as a tritium permeation barrier and an anti-corrosion layer is the essential technology for the development of a molten salt type self cooled fusion blanket. In the present study, the characteristics of a nitriding treatment on a reduced activation ferritic steel, JLF-1 (Fe-9Cr-2W-0.1C) as the functional layer were investigated. The steel surface was nitrided by an ion nitriding treatment or a radical nitriding treatment. The nitridation characteristic of the steel surface was made clear based on the thermodynamic stability. The thermal diffusivity, the hydrogen permeability and the chemical stability in the molten salt Flinak were investigated. The results indicated that the nitriding treatment can improve the compatibility in the Flinak without the decrease of the thermal diffusivity, though there was little improvement as the hydrogen permeation barrier.


coating, nitriding, blanket, corrosion, molten salt, FFHR

DOI: 10.1585/pfr.6.2405117


  • [1] A. Sagara et al., Fus. Sci. and Tech. 47, 524 (2005).
  • [2] T. Watanabe et al., J. Plasma Fusion Res. SERIES 9, 342 (2010).
  • [3] H. Hishinuma et al., J. Nucl. Mater., in press (2011).
  • [4] D. Zhang et al., Fus. Eng. and Design, in press (2011).
  • [5] M. Kondo et al., Fus. Eng. and Design 85, 1430 (2010).
  • [6] K. Fukada, Journal of the JSTP, vol.40, 13 (1999).
  • [7] W.J. Parker, R.J. Jenkins, C.P. Butler and G.L. Abbot, Journal of applied physics 32, 1679 (1961).
  • [8] D. Zhang, T. Tanaka and T. Muroga, J. Nucl. Mater., in press (2011).

This paper may be cited as follows:

Masatoshi KONDO, Takashi WATANABE, Teruya TANAKA, Dongxun ZHANG and Akio SAGARA, Plasma Fusion Res. 6, 2405117 (2011).