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Effect of the Evolution of Rheological Behavior over Deagglomeration Time on Optical Transparency of Polycrystalline Alumina Ceramics

A. Rahimian, M. Torki, S. Ghazanfari, B. Movahedi, R. Emadi

Journal of Ceramic Science and Technology, Vol. 10, No. 2 (2019), pp. 1-8

DOI: 10.4416/JCST2019-00047

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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.

Keywords

Optical materials, sintering, optical properties, ball milling.

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