Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Mechanical properties of $B_4C$ ceramics fabricated by a spark plasma sintering process

방전플라즈마 소결법을 이용한 고밀도 탄화 붕소 제조 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 Engineering, Hanyang University)
  • 김경훈 (요업기술원 기술응용확산센터) ;
  • 채재홍 (요업기술원 기술응용확산센터) ;
  • 박주석 (요업기술원 기술응용확산센터) ;
  • 김대근 (요업기술원 기술응용확산센터) ;
  • 심광보 (한양대학교 신소재공학부)
  • Published : 2007.06.30
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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 were obtained 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 was improved by a methanol washing process which can be removed $B_2O_3$ phase from a $B_4C$ powder surface. This improvement results ken the formation of homogeneous microstructure because the grain coarsening was suppressed by the elimination of $B_2O_3$ phase. Particularly, fracture toughness of the sintered specimen using a methanol washed powder improved over 30% compared with the specimen using an as-received commercial powder.

방전플라즈마 소결법을 적용하여 탄화붕소 세라믹스를 제조하여 그 소결 특성, 미세 구조 및 기계적 특성을 평가하였다. 탄화붕소의 소결에 방전플라즈마 소결법을 적용하여 소결 조제의 첨가 없이 전통적인 소결법보다 낮은 온도에서 99% 이상의 완전 치밀화된 소결체를 제작할 수 있었으며, 탄화붕소 분말의 메탄을 세척을 통하여 분말 표면에 형성되어 있는 $B_2O_3$ 상을 사전에 제거함으로써 결정립의 조대화를 방지하여 균일한 미세구조의 형성을 유도할 수 있었으며 결과적으로 탄화붕소 소결체의 기계적 특성을 향상시킬 수 있었다. 특히 파괴인성의 경우 메탄을 세척을 통하여 30% 이상의 물성 향상을 달성하였다.

Keywords

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