The Study on the Improvement of the Strength and the Thermal Shock Resistance of $Al_2O_3-ZrO_2$ Composites

$Al_2O_3-ZrO_2$ 복합체의 강도 및 열충격 저항의 향상에 관한 연구

  • Hwang, K.H. (Gyeongsang National Univ) ;
  • Bae, W.T. (Gyeongsang National Univ) ;
  • Choi, M.D. (Gyeongsang National Univ) ;
  • Oh, K.D. (Pusan National Univ) ;
  • Kim, K.U. (Seoul National Univ) ;
  • Kim, H. (Seoul National Univ)
  • 황규홍 (경상대학교 재료공학과) ;
  • 배원태 (경상대학교 재료공학과) ;
  • 최명덕 (경상대학교 재료공학과) ;
  • 오기동 (부산대학교 무기재료과) ;
  • 김경운 (서울대학교 무기재료과) ;
  • 김환 (서울대학교 무기재료과)
  • Published : 1988.03.01


The strength and thermal shock resistance of $Al_2O_3-ZrO_2$ composites have been studied. The tetragonal $ZrO_2$ powder containing 1 mol.% $Y_2O_3$ and monoclinic $ZrO_2$ powder were prepared by coprecipitation method and subsequently mixed with $Al_2O_3$ powder and granulated by sieving. Duplex composites were prepared by dry mixing matrix agglomerate with 15 to 30 vol.% of dispersion agglomerate, followed by pressing and sintering at 1$600^{\circ}C$ for1 hr. These $Al_2O_3-ZrO_2$ 2 composites having heterogeneous structure showed improved thermal shock behaviors because of the microcracking and pores in dispersed granules, and compressive stresses around dispersed granules resulting from $ZrO_2$ transformation.



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