Optimized vacuum/pressure sol impregnation processing of wood for the synthesis of porous, biomorphic SiC ceramics
✍ Scribed by J. Locs; L. Berzina-Cimdina; A. Zhurinsh; D. Loca
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 981 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0955-2219
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✦ Synopsis
Pine (Pinus silvestris) wood with shaped sample dimensions of 20 mm × 20 mm × 5 mm (axial) was selected as the raw material. Samples were dried and, for a half of the samples, resin extraction from the sample was applied. SiO 2 sol was prepared, and samples were impregnated under different vacuum/pressure conditions. Relative impregnation efficiency was calculated for impregnated samples and varied from 95 up to 105% of the theoretical value for different samples and impregnation conditions. Impregnation and drying procedures were repeated up to three times to increase the SiO 2 amount introduced in the sample. Impregnated samples were pyrolyzed at 500 • C under oxygen free atmosphere with the subsequent high temperature treatment at 1600 • C in an Ar atmosphere. 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 optimized vacuum/pressure impregnation technique is highly effective for the introduction of SiO 2 in the wood.