Reaction-Bonded and Superplastically Sinter-Forged Silicon Nitride–Silicon Carbide Nanocomposites |
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Authors: | Naoki Kondo Yoshikazu Suzuki Tatsuki Ohji |
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Affiliation: | National Industrial Research Institute of Nagoya, Nagoya, Aichi 462-8510, Japan |
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Abstract: | Silicon nitride–silicon carbide (Si3N4–SiC) nanocomposites were fabricated by a process involving reaction bonding followed by superplastic sinter-forging. The nanocomposites exhibited an anisotropic microstructure, in which rod-shaped, micrometer-sized Si3N4 grains tended to align with their long axes along the material-flow direction. SiC particles, typically measuring several hundred nanometers, were located at the Si3N4 grain boundaries, and nanosized particles were dispersed inside the Si3N4 grains. A high bending strength of 1246 ± 119 MPa, as well as a high fracture toughness of 8.2 ± 0.9 MPa·m1/2, was achieved when a stress was applied along the grain-alignment direction. |
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Keywords: | reaction bonding nanocomposites silicon nitride |
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