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Korean Carbon Society (한국탄소학회)
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Application and evaluation of boron nitride-assisted liquid silicon infiltration for preparing Cf/SiC composites

  • Kim, Jin-Hoon (Department of Fine Chemical Engineering and Applied Chemistry, BK21-E2M, Chungnam National University) ;
  • Jeong, Eui-Gyung (Department of Fine Chemical Engineering and Applied Chemistry, BK21-E2M, Chungnam National University) ;
  • Kim, Se-Young (Convergence Materials Research Center, Korea Institute of Energy Research) ;
  • Lee, Young-Seak (Department of Fine Chemical Engineering and Applied Chemistry, BK21-E2M, Chungnam National University)
  • Received : 2011.03.22
  • Accepted : 2011.05.24
  • Published : 2011.06.30
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Abstract

C/SiC composites were prepared by boron nitride (BN)-assisted liquid silicon infiltration (LSI), and their anti-oxidation and mechanical properties were investigated. The microstructures, bulk densities, and porosities of the C/SiC composites demonstrated that the infiltration of liquid silicon into the composites improved them, because the layered-structure BN worked as a lubricant. Increasing the amount of BN improved the anti-oxidation of the prepared C/SiC composites. This synergistic effect was induced by the assistance of BN in the LSI. More thermally stable SiC was formed in the composite, and fewer pores were formed in the composite, which reduced inward oxygen diffusion. The mechanical strength of the composite increased up to the addition of 3% BN and decreased thereafter due to increased brittleness from the presence of more SiC in the composite. Based on the anti-oxidation and mechanical properties of the prepared composites, we concluded that improved anti-oxidation of C/SiC composites can be achieved through BN-assisted LSI, although there may be some degradation of the mechanical properties. The desired anti-oxidation and mechanical properties of the composite can be achieved by optimizing the BN-assisted LSI conditions.

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References

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