Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Effect of Granule Characteristics of Mixed Powder on Mechanical Properties of Hot-Pressed SiC-Whisker/Alumina Composites

혼합분말의 과립특성이 가압소결 탄화규소 휘스커/알루미나 복합재료의 기계적 물성에 미치는 영향

  • 이해원 (한국과학기술연구원 세라믹스연구부) ;
  • 송휴섭 (한국과학기술연구원 세라믹스연구부)
  • Published : 1994.12.01
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Abstract

Mechanical properties of hot-pressed SiC whisker/Al2O3 composites were strongly dependent on the granular characteristics of mixed powder, which were controlled by co-dispersion condition, the existence of steric barrier on whisker surface, and granulating method, etc. Heat-treatment of SiC whiskers at $700^{\circ}C$ for 1 hr in air was very effective both for achieving dispersion stability of whiskers with PVA adsorption and for obtaining excellent mechanical properties of resulting composites. It is believed from the fractography of composites prepared with various whisker dispersion conditions that the most common fracture origin of Al2O3 agglomerate could be attributed to whisker clusters arising due to flocculation. Further improvement of mechanical properties of composites were achieved by hot pressing green tapes prepared by Doctor-blade process, which promoted two-dimensional random alignment of whiskers.

Keywords

References

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