Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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THE EFFECT OF SI-RICH LAYER COATING ON U-MO VS. AL INTERDIFFUSION

  • Ryu, Ho-Jin (Research Reactor Fuel Development Division, Korea Atomic Energy Research Institute) ;
  • Park, Jae-Soon (Research Reactor Fuel Development Division, Korea Atomic Energy Research Institute) ;
  • Park, Jong-Man (Research Reactor Fuel Development Division, Korea Atomic Energy Research Institute) ;
  • Kim, Chang-Kyu (Research Reactor Fuel Development Division, Korea Atomic Energy Research Institute)
  • Received : 2010.07.05
  • Accepted : 2010.11.12
  • Published : 2011.04.25
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Abstract

Si-rich-layer-coated U-7 wt%Mo plates were prepared in order to evaluate the diffusion barrier performance of the Si-rich layer in U-Mo vs. Al interdiffusion. Pure Si powder was used for coating the U-Mo plates by annealing at $900^{\circ}C$ for 1 h under vacuum of approximately 1 Pa. Si-rich layers containing more than 60 at% of Si were formed on U-7 wt%Mo plates. Diffusion couple tests were conducted in a muffle furnace at $560-600^{\circ}C$ under vacuum using Si-rich-layer-coated U-Mo plates and pure Al plates. Diffusion couple tests using uncoated U-Mo plates and Al-(0, 2 or 5 wt%)Si plates were also conducted for comparison. Si-rich-layer coatings were more effective in suppressing the interaction during diffusion couple tests between coated U-Mo plate and Al, when compared with U-Mo vs. Al-Si diffusion couples, since only small amounts of Al in the coating could be found after the diffusion couple tests. Si-rich-layer-coated U-7wt%Mo particles were also prepared using the same technique for U-7 wt%Mo plates to observe the microsturctures of the coated particles.

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References

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