Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effect of Microstructure on Conductivity of W-Cu Composite

W-CU 복합재료의 전도도에 미치는 미세조직의 영향

  • Lee Young Jung (Division of Materials Science and Engineering, Hanyang University) ;
  • Park Kwang Hyun (Division of Materials Science and Engineering, Hanyang University) ;
  • Lee Byung Hoon (Department of Industrial Engineering, Hanyang University) ;
  • Kim Deok-Soo (Department of Industrial Engineering, Hanyang University) ;
  • Kim Young Do (Division of Materials Science and Engineering, Hanyang University)
  • Published : 2005.02.01
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Abstract

[ $W-15wt.\%$ ] Cu nanocomposite powders are fabricated by ball-milling and subsequent hydrogen-reduction. The compacted parts of $W-15wt.\%Cu$ nanocomposite powders were sintered at $1200^{\circ}C$ for 1 h with various heating rates of 5 and $20^{\circ}C/min$. The homogeneity of the sintered microstructures was evaluated through homogeneity index by the standard deviation of Victor's hardness test. The W-W contiguities were calculated by using Voronoi diagrams. The sintered microstructure with the heating rate of $20^{\circ}C/min$ was more homogeneous and had lower W-W contiguity than that of $5^{\circ}C/min$. The microstructural homogeneity was directly related to the W-W contiguity. Thermal conductivity of the sintered parts with the heating rate of $20^{\circ}C/min$ was higher than that with heating rate of $5^{\circ}C/min$. This phenomenon indicates that the thermal conductivity is affected by the W-W contiguity resulting from the homogeneity of the sintered microstructure.

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References

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