| 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 |
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| ABSTRACT |
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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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