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http://dx.doi.org/10.4191/KCERS.2002.39.2.145

Glass-alumina Composites Prepared by Melt-infiltration: II. Kinetic Studies  

Lee, Deuk-Yong (Department of Materials Engineering, Daelim College of Technology)
Jang, Joo-Wung (Dental Material Research Center, We DongMyung Co. Ltd.)
Lee, Myung-Hyun (Advanced Materials Analysis and Evaluation Team, Korea Institute of Ceramic Engineering and Technology)
Lee, Jun-Kwang (Multifunctional Ceramics Research Center, Korea Institute of Science and Technology)
Kim, Dae-Joon (Multifunctional Ceramics Research Center, Korea Institute of Science and Technology)
Park, Il-Seok (Multifunctional Ceramics Research Center, Korea Institute of Science and Technology)
Publication Information
Journal of the Korean Ceramic Society / v.39, no.2, 2002 , pp. 145-152 More about this Journal
Abstract
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.
Keywords
Alumina; Lanthanum-aluminosilicate glass; Melt-infiltration; Penetration kinetic; Parabolic;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
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