BOOK_CONTENT
From Materials for Advanced Energy Systems and Fission & Fusion Engineering: Proceedings of the Seventh China-Japan Symposium

OVERVIEW

X. LIU [A] *, S. TAMURA [B] , K. TOKUNAGA [B] , N, YOSHIDA [B] , N. NODA [C]

Thermal behaviors of tungsten coating of 0.5 mm thick with multi-layers interface of tungsten (W) and rhenium (Re) coated on CFC (CX-2002U) substrate by vacuum plasma spraying (VPS) technique were examined by annealing with an electron beam thermal load facility between 1200 C and 2000 C. Change of the microstructure was observed and its chemical composition was analyzed by EDS after annealing. It was observed that remarkable recrystallization of VPS-W occurred above 1400 C. The structure of the multi-layers of W and Re become obscure by the mutual diffusion of W, Re and C above 1600 C and finally disappeared after annealing at 2000 C for one hour. Very hard tungsten carbides are formed at the interface above 1600 C and they were broadening with increasing annealing temperature and time.

Keywords: annealing; VPS-W; diffusion barrier; recrystallization; tungsten carbide

[A] Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041, Sichuan, P. R. China Fax: +86-28-82932202, E-Mail: xliu@swip.ac.cn

[B] Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasugakoen Kasuga, Fukuoka 816-8580, Japan

[C] National Institute for Fusion Science, Toki, Gifu 509-5292, Japan

1 INTRODUCTION

Tungsten is considered as the promising plasma facing material owing to its very high melting point, good thermal conductivity, low tritium retention and strong sputtering erosion resistance. Tungsten and its alloys made by powder metallurgy, however, have heavy weight and difficult processing. Therefore, coating of thin...

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Topics of Interest

Y.K.E, Y.C.WU Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei, Anhui, 230031, China Tel.:+86-551-5591397; fax: +86-551-5591310 E-mail: keyan@mail.ipp.ac.cn High...

N. NODA AND Y. KUBOTA, National Institute for Fusion Science, Toki 509-5292, Japan E-mail: noda@LHD.nifs.ac.jp Q. G. GUO Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001, P.

J.L.CHEN, J.G. LI, M.Y.YE AND D.M.YAO Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, P.R. China E-mail: ilch@mail.ipp.ac.cn N.NODA AND Y. KUBOTA National Institute for Fusion...

FU ZHANG, JIHONG WU, ZENGYU XU, YING XU Southwestern Institute of Physics P. O. Box 432 Chengdu 610041 China Email:zhangf@swip.ac.cn HHFC mock-ups with a structure of W/Cu/SS were developed by hot...

1.2 Proton Enhanced Diffusion Possibility of the enhancement of the diffusion processes in semiconductors under the influence of the flow of the particles was predicted by W. Shokley [Shokley, W.