Effect of Reinforcement of a Silicon Nitride Matrix by Silicon Carbide Whiskers |
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Authors: | Kelina I Yu Ershova N I Plyasunkova L A |
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Affiliation: | 1. Tekhnologiya Research and Production Association,, Obninsk State Research Center of the Russian Federation,, Obninsk, Kaluga Region,, Russia.
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Abstract: | A fine-grain high-density tough matrix is a general prerequisite for synthesis of high-strength and crack-resistant composite materials, as well as its self-reinforcement with extended grains of β-Si3N4 and reinforcement with β-SiC crystals. Both approaches are used simultaneously in the present work. It is shown that the reinforcement of a silicon nitride matrix based on ultradisperse powder compositions by SiC whiskers of grade TWS provides hot-pressed ceramics with a high ultimate bending strength (950 MPa) and crack resistance (10 MPa · m1/2). Reinforcement by fine or coarse whiskers increases the crack resistance by 30% with respect to monolithic Si3N4. Composites reinforced by TWS silicon carbide whiskers preserve their high strength up to 1500°C. |
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