한국세라믹학회지 (Journal of the Korean Ceramic Society)

  • 제31권9호
  • /
  • Pages.1021-1029
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  • 1994
  • /
  • 1229-7801(pISSN)
  • /
  • 2234-0491(eISSN)
한국세라믹학회 (The Korean Ceramic Society)
권호 표지

Hot Pressing에 의한 $Si_3N_4-SiC$ 나노복합체의 제조

Fabrication of $Si_3N_4-SiC$ Nanocomposites by Hot Pressing

  • 김성현 (부산대학교 무기재료공학과) ;
  • 김인술 (포항제철 기술연구소) ;
  • 박홍채 (부산대학교 무기재료공학과) ;
  • 오기동 (부산대학교 무기재료공학과)
  • 발행 : 1994.09.01
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초록

SiC ultrafine particles of 1, 10, 20 and 30 vol% were dispersed in $\alpha$-Si3N4 matrix and hot-pressed under the condition of 30 MPa at 1800 and 190$0^{\circ}C$ respectively. Physical, mechanical properties and microstructures of sintered Si3N4-SiC nanocomposites were investigated. Flexural strength and density of Si3N4-10 vol% SiC nanocomposites hot-pressed at 190$0^{\circ}C$ represented the 1002 MPa and 97.9%T.D respectively, and it was confirmed as a remarkable improvement of 67% compared to Si3N4 monolith. Fracture toughness was shown as 7.2 MPa.m1/2 when the same composition was hot pressed at 180$0^{\circ}C$. This effect was supposed to be due to the improvement of microstructure by the adequate suppression of the excessive growth of Si3N4 grain with SiC nano-particles.

키워드

참고문헌

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