Proceedings of the Korea Committee for Ocean Resources and Engineering Conference (한국해양공학회:학술대회논문집)

Korean Society of Ocean Engineers (한국해양공학회)
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Effects of $SiO_2$ Particle-size on Fabrication Properties of LPS-SiC Ceramics

LPS-SiC 세라믹스의 제조특성에 미치는 $SiQ_2$ 입자크기의 영향

  • Kim, Seong-Hoon (Department of Mechanical Engineering, Graduate School of Dong-Eui University) ;
  • Yoon, Han-Ki (Department of Mechanical Engineering, Dong-Eui University) ;
  • Kim, Bu-An (Division of Materials Science and Engineering, Bukyong National University)
  • 김성훈 (동의대학교 기계공학과 대학원) ;
  • 윤한기 (동의대학교 기계공학과) ;
  • 김부안 (부경대학교 신소재공학부)
  • Published : 2006.11.16
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Abstract

In this study, Liquid Phase Sintered SiC (LPS-SiC) was fabricated by hot pressing method with $\beta$-SiC powder whose a particle size is 30nm and less on the average in argon condition at 1780 and $1800^{\circ}C$ under 20MPa. Alumina ($Al_2O_3$), yttria ($Y_2O_3$) and silica ($SiO_2$) were used for sintering additives. To investigate effects of particle-size and temperature on $SiO_2$, LPS-SiC was fixed $Al_2O_3$, $Y_2O_3$ and then particle-size of $SiO_2$ were changed as two kinds. The system of particle-size and temperature on sintering additives which affects a property of sintering os well os the influence depending on particle-size and temperature of sintering additives were investigated by measurement of sintering properties. Such as measurement of sintering density, vikers hardness and observing of microstructure were investigated to make sure of the optimum condition which is about matrix of $SiC_f/SiC$ composites. Base on the composition of sintering additives, microstructure and sintering property correlation, the effect of particle-size of sintering additives are discussed. An experimental method to investigate the dynamic characteristics of bums in extreme environmental condition is established.

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