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J. Korean Ceram. Soc. > Volume 39(2); 2002 > Article
Journal of the Korean Ceramic Society 2002;39(2): 145.
doi: https://doi.org/10.4191/kcers.2002.39.2.145
용융침투법으로 제조한 유리-알루미나 복합체: II. Kinetic 연구
이득용, 장주웅1, 이명현2, 이준강3, 김대준3, 박일석3
대림대학 재료정보공학과
1(주)우리동명 치과재료연구소
2KICET 신소재분석평가팀
3KIST 복합기능세라믹센터
Glass-alumina Composites Prepared by Melt-infiltration: II. Kinetic Studies
Deuk-Yong Lee, Joo-Wung Jang1, Myung-Hyun Lee2, Jun-Kwang Lee3, Dae-Joon Kim3, Il-Seok Park3
Department of Materials Engineering, Daelim College of Technology
1Dental Material Research Center, We DongMyung Co. Ltd.
2Advanced Materials Analysis and Evaluation Team, Korea Institute of Ceramic Engineering and Technology
3Multifunctional Ceramics Research Center, Korea Institute of Science and Technology
Four commercial alumina powders having different particle size of $0.5{mu}m,;2.8{mu}m,;12{mu}m,;and;45{mu}m$ were presintered at 1120$^{circ}C$ for 2h and then lanthanum aluminosilicate glass was infiltrated at 1100$^{circ}C$ for 2h in the interval of 0.1h to investigate the penetration kinetic of the glass into the alumina preforms. The infiltration distance is parabolic with respect to time as described by the Washburn equation and the penetration rate constant, K, increases with raising the alumina particle size. The strength of glass-alumina composites increases as the alumina particle size reaches to 2.8${mu}m$ due to the increase in packing, however, decreases with further increasing the alumina particle size. The fracture toughness of the composites rises with increasing the alumina particle size due to the crack bowing and the interaction between crack and alumina particles.
Key words: Alumina, Lanthanum-aluminosilicate glass, Melt-infiltration, Penetration kinetic, Parabolic
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