Novel Mullite Synthesis Based on Alumina Nanoparticles and a Preceramic Polymer |
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Authors: | Enrico Bernardo,Paolo Colombo,Eckhard Pippel, Jö rg Woltersdorf |
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Affiliation: | Dipartimento di Ingegneria Meccanica—Settore Materiali, Universitàdi Padova, via Marzolo 9, 35131 Padova, Italy; Max-Planck-Institut für Mikrostrukturphysik, D-06120 Halle, Germany |
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Abstract: | Heating in air of a selected mixture of a silicone resin and alumina nanoparticles in the temperature range 1200°–1500°C yielded dense, crack-free mullite samples. Al2O3, due to its nanometric size, proved to be very reactive toward silica, deriving from the ceramization of the preceramic polymer, leading to the formation of a large volume fraction of mullite crystals even at low firing temperatures (1250°C). Because of the homogeneity of the distribution of alumina nanoparticles in the starting system, the ceramized samples exhibited a very fine microstructure consisting of crystals with an average dimension in the range of 50–300 nm. |
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