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Porous mullites with a whiskers framework and high porosities were fabricated by the reaction sintering (1100 to 1600°C, 1h, in an airtight container) of an aerogel block shaped by the sol–gel transition of a mullite precursor composed of SiO2 sol, Al2O3 and AlF3 powders (as reaction catalyst). The effect of heating temperatures on porosity, whisker formation, microstructure feature and compressive...
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