Changes of composition and microstructure of joint interface of tungsten coated carbon by high heat flux

K. Tokunaga, T. Matsubara, Y. Miyamoto, Y. Takao, N. Yoshida, N. Noda, Y. Kubota, T. Sogabe, T. Kato, L. Plöchl

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Abstract

Tungsten coatings of 0.5 and 1 mm thickness were successfully deposited by the vacuum plasma spraying (VPS) technique on carbon/carbon fiber composite (CFC), CX-2002U and Isotropic fine grained graphite, IG-430U. High heat flux experiments by irradiation of electron beam with uniform profile were performed on the coated samples in order to prove the suitability and load limit of such coating materials. The cross-sectional composition and structure of the interface of VPS-W and carbon material samples were investigated. Compositional analyses showed that the Re/W multi-layer acts as diffusion barrier for carbon and suppresses tungsten carbide formation in the VPS-W layer at high temperature about 1300°C. Microstructure of the joint interface of the sample changed in the case of a peak temperature of about 2800°C. The multi-layer structure completely disappeared and compositional distribution was almost uniform in the interface of the sample after melting and resolidification. The diffusion barrier for carbon is not expected to act in this stage.

Original languageEnglish
Pages (from-to)1121-1127
Number of pages7
JournalJournal of Nuclear Materials
Volume283-287
Issue numberPART II
DOIs
Publication statusPublished - Jan 1 2000

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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    Tokunaga, K., Matsubara, T., Miyamoto, Y., Takao, Y., Yoshida, N., Noda, N., Kubota, Y., Sogabe, T., Kato, T., & Plöchl, L. (2000). Changes of composition and microstructure of joint interface of tungsten coated carbon by high heat flux. Journal of Nuclear Materials, 283-287(PART II), 1121-1127. https://doi.org/10.1016/S0022-3115(00)00384-6