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J. Korean Ceram. Soc. > Volume 38(10); 2001 > Article
Journal of the Korean Ceramic Society 2001;38(10): 936.
알루미나 입도가 (Y,Nb)-TZP/${Al_2}{O_3}$ 복합체의 R-curve 거동에 미치는 영향
이득용, 김대준1, 김배연2, 송요승3
대림대학 재료정보공학과
1KIST 복합기능세라믹센터
2인천대학교 재료공학과
3한국항공대학교 항공재료공학과
Effect of Alumina Particle Size on R-curve Behavior of (Y,Nb)-TZP/${Al_2}{O_3}$ Composites
Deuk-Yong Lee, Dae-Joon Kim1, Bae-Yeon Kim2, Yo-Seung Song3
Department of Materials Engineering, Daelim College of Technology
1Multifunctional Ceramics Research Center, KIST
2Department of Materials Engineering, University of Incheon
3Department of Materials Engineering, Hankuk Aviation University
The influence of the ${Al_2}{O_3}$ particle size on flaw tolerance of the $ZrO_2/{Al_2}{O_3}$ composites prepared by mixing 5.31 mol% ${Y_2}{O_3}$-4.45 mol% ${Nb_2}{O_5}$-90.31 mol% $ZrO_2$ and ${Al_2}{O_3}$ was investigated. The composites exhibited rising R-curve behavior and plateau fracture toughness of 7.9 and $8.8MPam^{1/2}$ for the additions of 20 vol% of 0.2 and $2.8{mu}m$ ${Al_2}{O_3}$ particles, respectively. The difference in the fracture toughness resistance was attributed mainly to the grain size of tetragonal $ZrO_2$ phase in the composites, which scaled with the ${Al_2}{O_3}$ particle size.
Key words: $ZrO_2/{Al_2}{O_3}$ composite, Fracture toughness, R-curve, Phase transformation toughening, Grain bridging toughening
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