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

The Korea Association of Crystal Growth (한국결정성장학회)
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Microstructure and mechanical properties of B4C-SiC composites

탄화붕소-탄화규소 복합체의 미세구조와 기계적 특성

  • So, Sung Min (Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Kyoung Hun (Korea Institute of Ceramic Engineering and Technology) ;
  • Park, Joo Seok (Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Min Suk (Information Materials Lab. Materials Engineering, Inha University) ;
  • Kim, Hyung Sun (Information Materials Lab. Materials Engineering, Inha University)
  • Received : 2019.11.18
  • Accepted : 2019.12.12
  • Published : 2019.12.31
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Abstract

B4C-SiC composites were fabricated using hot press sintering method without sintering additives at 1,900~2,000℃ under a pressure of 40 MPa. The crystal phase, relative density, microstructure, and mechanical properties of B4C-SiC composites were evaluated. When B4C and SiC were uniformly dispersed in the composite, grain growth was inhibited, and a sintered body with a fine and uniform microstructure, with improved mechanical properties, was fabricated. The relative density of B4C-SiC composites sintered under 2,000℃ of temperature and 40 MPa of pressure was over 99.8 %, and the bending strength and Vicker's hardness at 50 wt% of B4C were 645 MPa and 30.6 GPa, respectively.

B4C-SiC 복합체를 소결 첨가제 없이 일축가압소결법을 통해 제조하였으며 소결체의 결정상, 상대밀도, 미세구조 및 기계적 특성을 평가하였다. 제조된 B4C-SiC 복합체에서 B4C와 SiC는 균일하게 분산되어 결정립 성장을 억제하고 세밀하고 균일한 미세구조를 형성하였으며 이를 통해 B4C-SiC 복합체의 기계적 특성을 향상시킬 수 있었다. 소결온도 2,000℃, 40 MPa 압력 조건에서 소결된 B4C-SiC 복합체의 상대밀도는 99.8 % 이상이었으며, B4C 50 wt% 조성 복합체의 꺾임 강도와 비커스 경도는 각각 약 625 MPa과 30 GPa로 측정되었다.

Keywords

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