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

The Korea Association of Crystal Growth (한국결정성장학회)
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Characterization of crack self-healing of silicon carbide by hot press sintering

열간가압소결법으로 제조한 탄화규소의 균열자기치유 특성

  • Kim, Seong-Hoon (Business Cooperation Center, Korea Institute of Ceramic Engineering and Technololgy) ;
  • Kim, Kyung-Hun (Business Cooperation Center, Korea Institute of Ceramic Engineering and Technololgy) ;
  • Dow, Hwan-Soo (Business Cooperation Center, Korea Institute of Ceramic Engineering and Technololgy) ;
  • Park, Joo-Seok (Business Cooperation Center, Korea Institute of Ceramic Engineering and Technololgy) ;
  • Kim, Kyung-Ja (Business Cooperation Center, Korea Institute of Ceramic Engineering and Technololgy) ;
  • Shim, Kwang-Bo (Division of Materials Science and Engineering, Hanyang University)
  • 김성훈 (한국세라믹기술원 기업협력센터) ;
  • 김경훈 (한국세라믹기술원 기업협력센터) ;
  • 도환수 (한국세라믹기술원 기업협력센터) ;
  • 박주석 (한국세라믹기술원 기업협력센터) ;
  • 김경자 (한국세라믹기술원 기업협력센터) ;
  • 심광보 (한양대학교 신소재공학과)
  • Received : 2016.03.31
  • Accepted : 2016.04.19
  • Published : 2016.04.30
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Abstract

In this study, it was investigated that characteristic of crack-self-healing of hot-pressed SiC. SiC ceramics was sintered with $Al_2O_3$ and $Y_2O_3$ sintering additive by hot press. Sintering was performed in hot-press furnace in flowing argon (Ar), holding for 3 hr under $1950^{\circ}C$ and 50 MPa. The sintered SiC was machined into 3-point bending strength specimen of $3{\times}4{\times}40mm$, and introduced pre-crack by Vickers indentation at 49.6 N. Specimens were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), 3-point bending strength after heat treatment at $1200{\sim}1400^{\circ}C$ for 1~10 hr. The best crack-self-healing ability was achieved 770 MPa 3-point bending strength by heat treatment at $1300^{\circ}C$ for 5 hr.

본 연구에서는 열간가압소결법으로 SiC를 소결하여 균열자기치유 특성을 분석하였다. SiC는 $Al_2O_3$와 $Y_2O_3$를 소결조제로 $1950^{\circ}C$, 50 MPa, 아르곤(Ar) 분위기에서 소결하였다. 소결된 시편을 $3{\times}4{\times}40mm$, 절단 및 가공하고, Vickers 경도기를 이용하여 49.6 N으로 예비균열을 생성하였다. $1200{\sim}1400^{\circ}C$, 1~10시간 산화분위기에서 열처리한 후 XRD, SEM, 3점 굽힘강도를 측정하였다. $1300^{\circ}C$ 1시간에서 741 MPa, 5시간에서 770 MPa로 가장 우수한 균열자기치유 효과를 나타내는 것으로 분석되었다.

Keywords

References

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