Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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High Strength $Si_3N_4/SiC$ Structural Ceramics

고강도 $Si_3N_4/SiC$ 구조세라믹스에 관한 연구

  • 김병수 (부산대학교 무기재료공학과) ;
  • 김인술 (산업과학기술연구소) ;
  • 장윤식 (부산대학교 무기재료공학과) ;
  • 박홍채 (부산대학교 무기재료공학과) ;
  • 오기동 (부산대학교 무기재료공학과)
  • Published : 1993.12.01
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Abstract

Si3N4(p)-SiC(p) composites were prepared by gas pressure sintering at 190$0^{\circ}C$ for 1 hour. $\alpha$-SiC with average particle size of 0.48${\mu}{\textrm}{m}$ were dispersed from zero to 50vol% in $\alpha$-Si3N4 with average particle size of 0.5${\mu}{\textrm}{m}$. Y2O3-Al2O3 system was used as sintering aids. When 10vol% of SiC was added to Si3N4, optimum mechanical properties were observed; relative density of 98.8%, flextural strength of 930MPa, fracture toughness of 5.9MPa.m1/2 and hardness value of 1429kg/$\textrm{mm}^2$. Grain growth of $\beta$-Si3N4 was inhibited as the amount of added SiC was increased. SiC particles were found inside the $\beta$-Si3N4 intragrains in case of 10, 20 and 30vol%SiC added composites.

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References

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