Effect of Reinforcement of a Silicon Nitride Matrix by Silicon Carbide Whiskers

Effect of Reinforcement of a Silicon Nitride Matrix by Silicon Carbide Whiskers 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Refractories and Industrial Ceramics Springer Journals

Effect of Reinforcement of a Silicon Nitride Matrix by Silicon Carbide Whiskers

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Publisher
Kluwer Academic Publishers-Plenum Publishers
Copyright
Copyright © 2000 by Plenum Publishing Corporation
Subject
Materials Science; Characterization and Evaluation of Materials; Materials Science, general; Ceramics, Glass, Composites, Natural Materials
ISSN
1083-4877
eISSN
1573-9139
D.O.I.
10.1023/A:1011304300466
Publisher site
See Article on Publisher Site

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.

Journal

Refractories and Industrial CeramicsSpringer Journals

Published: Oct 7, 2004

References

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