Mechanical Properties of SiC Fiber-Reinforced Reaction-Bonded Si3N4 Composites.
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CENTER
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The room temperature mechanical and physical properties of silicon carbide fiber-reinforced reaction-bonded silicon nitride composites SiCRBSN have been evaluated. The composites contained similiar to 23 and similiar to 40 volume fraction of aligned 140 micron diameter chemically vapor deposited SiC fibers. Preliminary results for composites tensile and bend strengths and fracture strain indicate that the composites displayed excellent properties when compared with unreinforced RBSN of comparable porosity. Fiber volume fraction showed little influence on matrix first cracking strain did influence the stresses required for matrix first cracking and for ultimate composite fracture strength. It is suggested that by reducing matrix porosity and by increasing the volume fraction of the large diameter SiC fiber, it should be possible to further improve the composite stress at which the matrix first cracks. Keywords Ceramic powders Composite fabrication Microstructure Density Axial bend and tensile Strength and Integrated shear strength.
- *FIBER REINFORCED COMPOSITES
- *CERAMIC MATERIALS
- MECHANICAL PROPERTIES
- TENSILE STRENGTH
- COMPOSITE MATERIALS
- SILICON COMPOUNDS
- SILICON NITRIDES
- SHEAR STRENGTH
- Ceramics, Refractories and Glass
- Laminates and Composite Materials