J. Korean Ceram. Soc. > Volume 22(6); 1985 > Article
 Journal of the Korean Ceramic Society 1985;22(6): 42.
 $Al_2O_3/Cr_2O_3-ZrO_2/HfO_2$ 계의 기계적 거동 신동우, 오근호, 이종근 한양대학교 무기재료공학과 Mechanical Behavior of $Al_2O_3/Cr_2O_3-ZrO_2/HfO_2$ System 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.
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