Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Mechanical Behavior of $Al_2O_3/Cr_2O_3-ZrO_2/HfO_2$ System

$Al_2O_3/Cr_2O_3-ZrO_2/HfO_2$ 계의 기계적 거동

  • 신동우 (한양대학교 무기재료공학과) ;
  • 오근호 (한양대학교 무기재료공학과) ;
  • 이종근 (한양대학교 무기재료공학과)
  • Published : 1985.06.01
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Abstract

Several $Al_2O_3$-based polycrystalline which had different dopant ratio in the range of 0.5mol% were prepared by doping pure $Cr_2O_3$ $HfO_2$. Single crystalline which had same composition with above polycrystalline were made by means of floating zone method. This study examined the role of each dopant for enhancing the mechanical properties of $Al_2O_3$-based Ceramics. Optical micrographs $({ imes}200)$ of $Al_2O_3-Cr_2O_3$ single crystal showing not only radial crack (rc) on the specimen surface but median crack(mc) and lateral crack(lc) under surface at the edge of indentation mark. Fracture toughness of Al2O3-based Ceramics was increased with $ZrO_2$ content. Alloying effect of $Cr_2O_3$ contributed to the hardness of $Al_2O_3$ based ceramics.

Keywords

References

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