Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
권호 표지

A Study on Improvement of Fracture Toughness of $\beta-SiC-ZrB_2$Composites

$\beta-SiC-ZrB_2$ 복합체의 파괴인성 증진연구

  • Shin Yong-Deok (School of Electrical and Electronic Engineering, WonKwang University) ;
  • Ju, Jin-Young (School of Electrical and Electronic Engineering, WonKwang University) ;
  • Yoon, Se-Won (School of Electrical and Electronic Engineering, WonKwang University) ;
  • Hwang, Chul (School of Electrical and Electronic Engineering, WonKwang University) ;
  • Song, Joon-Tae (School of Electrical and Computer Engineering, Sung Kyun Kwan University)
  • 신용덕 (원광대학교 공과대학 전기전자공학부) ;
  • 주진영 (원광대학교 공과대학 전기전자공학부) ;
  • 윤세원 (원광대학교 공과대학 전기전자공학부) ;
  • 황철 (원광대학교 공과대학 전기전자공학부) ;
  • 송준태 (성균관대학교 공과대학 전기전자 및 컴퓨터공학부)
  • Published : 1999.05.01
Download PDF
⟨ Previous Next ⟩

Abstract

The effect of AI$_2$O$_3$+Y$_2$O$_3$additives on fracture toughness of $\beta$-SiC-ZrB$_2$composites by hot-pressed sintering were Investigated. The $\beta$-SiC-ZrB$_2$ ceramic composites were hot-presse sintered and annealed by adding 1, 2, 3wt% AI$_2$O$_3$+Y$_2$O$_3$(6:4wt%) powder as a liquid forming additives at 195$0^{\circ}C$ for 4h. In this microstructures, no reactions were observed between $\beta$-SiC and ZrB$_2$, and the relative density Is over 90.79% of the theoretical density and the porosity decreased with increasing AI$_2$O$_3$+Y$_2$O$_3$ contents. Owing to crack deflection and crack bridging of fracture toughness mechanism, the fracture toughness showed the highest of 5.5328MPa . m$^{1}$2/ for composites added with 2wt% AI$_2$O$_3$+Y$_2$O$_3$ additives at room temperature. But the standard deviation of fracture toughness of specimens decreased with increasing AI$_2$O$_3$+Y$_2$O$_3$ contents and showed the highest of 0.8624 for composite tilth 1wt%, AI$_2$O$_3$+Y$_2$O$_3$additives.

Keywords