Fibrous Monolithic Ceramics: II, Flexural Strength and Fracture Behavior of the Silicon Carbide/Graphite System
- 1 September 1993
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 76 (9) , 2217-2224
- https://doi.org/10.1111/j.1151-2916.1993.tb07757.x
Abstract
The fibrous monolith microstructure consists of high aspect ratio polycrystalline cells of SiC separated by thin cell boundaries containing graphite. The SiC/100% graphite fibrous monolith has noncatastrophic fracture behavior, is damage tolerant, and is notch insensitive. The failure process is characterized by fracture along weak graphite cell boundaries. The room‐temperature flexural strength is 300–350 MPa. The estimated shear strength along the graphite cell boundaries is ∼ 15 MPa. Increasing the strength of the cell boundary by additions of SiC (40–60 vol%) results in a monolithic SiC material showing brittle fracture behavior but retaining damage tolerance. Strength and fracture behavior are also influenced by cell texture and orientation.Keywords
This publication has 13 references indexed in Scilit:
- Fibrous Monolithic Ceramics: I, Fabrication, Microstructure, and Indentation BehaviorJournal of the American Ceramic Society, 1993
- Unique Opportunities for Microstructural Engineering with Duplex and Laminar Ceramic CompositesJournal of the American Ceramic Society, 1992
- High Toughness Silicon CarbidePublished by Wiley ,1991
- A simple way to make tough ceramicsNature, 1990
- Delamination Cracking in a Laminated Ceramic‐Matrix CompositeJournal of the American Ceramic Society, 1990
- Tension and flexural strength of silicon carbide fibre-reinforced glass ceramicsJournal of Materials Science, 1986
- Failure Mechanisms in Ceramic‐Fiber/Ceramic‐Matrix CompositesJournal of the American Ceramic Society, 1985
- The fracture and toughness of woodsProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1985
- High-strength silicon carbide fibre-reinforced glass-matrix compositesJournal of Materials Science, 1980
- A mechanism for the control of crack propagation in all-brittle systemsProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1964