Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 32, Issue 12, Pages 3097-3102Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2012.04.020
Keywords
Sintering; Optical properties; Hardness; Transparent ceramic
Categories
Funding
- Research Fellowships of the Japan Society for the Promotion of Science for Young Scientists
- Global COE Program of Materials Integration, Tohoku University
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Transparent lutetium aluminum garnet (Lu3Al5O12, LuAG) was fabricated by reactive spark plasma sintering. The effect of sintering temperature on the crystal phase, microstructure, transparency and mechanical properties of LuAG bodies was investigated. Fully dense and single-phase LuAG bodies were obtained at sintering temperatures 1573-1923 K. The average grain size increased from 0.18 to 0.52 mu m with increasing sintering temperature from 1573 to 1773 K, and grain growth became significant at 1823 K. Transmittance showed a maximum value of 77.8% at 2000 nm at a sintering temperature of 1773 K after annealing at 1423 K in air for 43.2 ks. The Vickers hardness increased from 14.2 to 17.2 GPa with decreasing grain size from 7.45 to 0.23 mu m. (c) 2012 Elsevier Ltd. All rights reserved.
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