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Sintering Behavior and Mechanical Property of B4C Ceramics Fabricated by Spark Plasma Sintering

방전플라즈마 소결법에 의한 탄화 붕소 세라믹스의 소결 거동 및 기계적 특성

  • Kim, Kyoung-Hun (Korea Institute of Ceramic Engineering and Technology) ;
  • Chae, Jae-Hong (Korea Institute of Ceramic Engineering and Technology) ;
  • Park, Joo-Seok (Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Dae-Keun (Korea Institute of Ceramic Engineering and Technology) ;
  • Shim, Kwang-Bo (Division of Advanced Materials Science and Engineering, Hanyang University) ;
  • Lee, Byung-Ha (Department of Materials Science and Engineering, Myongji University)
  • Published : 2008.01.31

Abstract

[ $B_4C$ ] ceramics were fabricated by spark plasma sintering process and their sintering behavior, microstructure and mechanical properties were evaluated. Relative density of $B_4C$ ceramics could be achieved by spark plasma sintering method reached as high as 99% at lower temperature than conventional sintering method, in addition, without any sintering additives. The mechanical properties of $B_4C$ ceramics could be improved by the heat treatment at $1300^{\circ}C$ during sintering process which can be removed $B_2O_3$ phase from a $B_4C$ powder surface. This improvement results from the formation of a fine and homogeneous microstructure because the grain coarsening was suppressed by the elimination of $B_2O_3$ phase. Particularly, mechanical properties of the specimen experienced the $B_2O_3$ removing process improved over 30% compared with the specimen without that process.

Keywords

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