Al2O3-SiCセラミックスの焼結性の改良

概要

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The Al2O3-SiC mixed powder with additional SiO2 powder and pre-oxidized Al2O3-SiC mixed powder containing SiO2 were hot-pressed in Ar. The sinterability of these starting powders were examined comparing with the Al2O3-SiC mixed powder free from SiO2. The structures and transverse-rupture strength (T.R.S.) of hot-pressed ceramics were also examined. It was found that the sinterability of Al2O3-SiC mixed powder was markedly improved with containing over 2-3% SiO2. This was considered to be due to mullite formation and appearance of mullite-SiO2 eutectic liquid during the period of rising temperature to hot-pressing one. With increasing SiO2 contents, the microstructure became locally coagulated and T.R.S. decreased slightly. As the fracture source, an even area of φ70-80 μm, probably due to the coagulated structure, was observed. These results were in detail discussed.
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