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Technique for preparing porous Al2O3 ceramics by biotemplating from wood |
School of Material Science and Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China)
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Abstract A new porous alumina ceramic with wood tracheid structure was developed by Al2O3 and wood powder via two methods:direct and indirect sintering. X - ray diffraction (XRD) and scanning electron microscopy (SEM) were used for phase identification and to examine microstructures of porous alumina ceramic. The density and apparent porosity were evaluated by Archimend's law. The two methods were analysed in detail. The results show that the better properties of porous alumina ceramics are obtained by the methods of indirect sintering. The microstructures of wood are reserved well in porous alumina ceramics. The indirect sintering is a way to prepare porous alumina ceramics with low density and high open porosity, which can also avoid high distortion or cracking of samples, and the bending strength of porous ceramics increases obviously.
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