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Yttrium Disilicate Micro-Cellular Architecture from Biotemplating of Luffa Cylindrica

S.C. Santos, C. Yamagata, A.C. Silva, L.F.G. Setz, S.R.H. Mello-Castanho

Journal of Ceramic Science and Technology, Vol. 5, No. 3 (2014), pp. 203-208

DOI: 10.4416/JCST2014-00008

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Abstract

The aim of this study consists in producing porous yttrium disilicate components by using Luffa Cylindrica vegetable sponge as a template for the replica method. With consideration of the effectiveness of additives, solids content and pH, the rheological behavior of yttrium disilicate aqueous suspensions was evaluated. Stabilization of the suspensions was achieved with an electrostatic mechanism using tetraethylammonium hydroxide and with an electrosteric mechanism by adding polyacrylic ammonium salt. Shear thinning suspensions were prepared by adding 2 wt% polyelectrolyte, pH 10, and 0.4 wt% binder. This condition promoted reliable impregnation results as well as improved mechanical strength of impregnated sponges. The sintering of impregnated samples at 1500°C/7 h resulted in porous components with a morphology similar to biotemplated micro-cellular architecture and a density of 3.21 g·cm-3 that corresponds to 80 % of theoretical density (4.04 g%·cm-3). Thermoluminescence characterization of yttrium disilicate powders showed that whole light emission occurred in the infrared range (λ = 750 – 4300 nm), with the wavelength at 1000 nm at 400 ÂºC.

Keywords

Disilicate, ceramic processing, luminescence, porous ceramic, rheology.

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