Investigation of the Feasibility of Pyrolytic Obtaining of Porous Biomorphic SiC Ceramics
Journal of Analytical and Applied Pyrolysis 2009
Aivars Žūriņš, Jānis Ločs, Līga Bērziņa-Cimdiņa

Today's nature increasingly becomes a model for innovation in structural design. For this reason, biomorphic ceramics prepared by the biotemplating technique, where natural grown structures are used as bulk templates for fast high-temperature conversion into ceramics, has attracted a lot of attention. For example, the introduction of silicon in wood opens up the possibility to obtain porous silicon carbide ceramics during high-temperature treatment in an inert atmosphere. Pine (Pinus silvestris) wood with shaped sample dimensions of 20 mm × 20 mm × 5 mm (axial) was selected as the raw material. SiO2 sol was prepared, and samples were impregnated under different vacuum/pressure conditions. Impregnated samples were pyrolysed at 500 °C under oxygen-free atmosphere with the subsequent high-temperature treatment at 1600 °C in an Ar atmosphere—the obtained ceramic materials retained a tubular pore structure of pinewood. Biomorphic SiC ceramics and its precursors were investigated using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). An experimental result shows that the optimised vacuum/pressure impregnation technique is highly effective for introduction of SiO2 in the wood. Staged pyrolysis treatment decreases the amount of vapours in a high-temperature oven, although the first pyrolysis step cannot exceed 600 °C, while the resulting template cooling gives some quantities of hard melting SiO2 crystallic modification.

Atslēgas vārdi
Wood; Pyrolysis; Silicon carbide

Žūriņš, A., Ločs, J., Bērziņa-Cimdiņa, L. Investigation of the Feasibility of Pyrolytic Obtaining of Porous Biomorphic SiC Ceramics. Journal of Analytical and Applied Pyrolysis, 2009, Vol.85, Iss.1–2, 544.-548.lpp. ISSN 0165-2370. Pieejams: doi:10.1016/j.jaap.2008.12.005

Publikācijas valoda
English (en)
RTU Zinātniskā bibliotēka.
E-pasts:; Tālr: +371 28399196