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Yttrium Disilicate Micro-Cellular Architecture from Biotemplating of Luffa Cylindrica
S.C. Santos1, C. Yamagata1, A.C. Silva1, L.F.G. Setz2, S.R.H. Mello-Castanho1
1 Nuclear and Energy Research Institute, IPEN-CCTM, 2242 Lineu Prestes Avenue. University City, 05508000, São Paulo, SP, Brazil
2 Federal University of ABC, Center for Engineering, Modeling and Applied Social Science, 5001 Do Estado Avenue. Santo André, 09210 – 580, SP, Brazil
received February 24, 2014, received in revised form May 15, 2014, accepted June 13, 2014
Vol. 5, No. 3, Pages 203-208 DOI: 10.4416/JCST2014-00008
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 ºC.
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Keywords
Disilicate, ceramic processing, luminescence, porous ceramic, rheology.
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