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Effect of the Evolution of Rheological Behavior over Deagglomeration Time on Optical Transparency of Polycrystalline Alumina Ceramics
A. Rahimian1, M. Torki2, S. Ghazanfari1, B. Movahedi2, R. Emadi1
1 Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156 – 83111, Iran
2 Department of Nanotechnology Engineering, Faculty of Advanced Sciences and Technologies, University of Isfahan, Isfahan, 81746 – 73441, Iran
received June 23, 2019, received in revised form August 6, 2019, accepted August 15, 2019
Vol. 10, No. 2, Pages 1-8 DOI: 10.4416/JCST2019-00047
Abstract
In this study, polycrystalline alumina ceramics were fabricated using slip casting and spark plasma sintering (SPS) methods. After being slip-cast, the samples were sintered at 1 350 and 1 450 °C for 20 min. The effect of the ball-milling time on the rheological behavior of alumina suspensions with different solid loads (65, 70 and 75 wt%) as well as on the ceramic densification process, microstructural evolution and optical transparency was investigated. It was demonstrated that the optimum ball-milling time to obtain rheological behavior suitable for slip casting was 6 h. Those samples prepared in order to demonstrate optimum rheological behavior and sintered at the optimum temperature were transparent. The highest real in-line transmittance (52 % at a wavelength of 640 nm) was determined for those samples ball-milled for 6 h, with 70 wt% solid load and sintered in the SPS process at 1 450 °C.
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Keywords
Optical materials, sintering, optical properties, ball milling.
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