Heat-Resistant Silicon Carbide with Aluminum Nitride and Erbium Oxide |
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Authors: | Young-Wook Kim Mamoru Mitomo Toshiyuki Nishimura |
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Affiliation: | Department of Materials Science and Engineering, The University of Seoul, Seoul 130–743, Korea;National Institute for Materials Science, Ibaraki 305–0044, Japan |
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Abstract: | Fully dense SiC ceramics with high strength at high temperature were obtained by hot-pressing and subsequent annealing under pressure, with AlN and Er2O3 as sintering additives. The ceramics had a self-reinforced microstructure consisting of elongated SiC grains and a grain-boundary glassy phase. The strength of these ceramics was ~550 MPa at 1600°C, and the fracture toughness was ~6 MPa·m1/2 at room temperature. The beneficial effect of the new additive composition on high-temperature strength might be attributable to the introduction of aluminum from the liquid composition into the SiC lattice, resulting in a refractive grain-boundary glassy phase. |
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Keywords: | aluminum nitride erbium/erbium compounds silicon carbide |
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