Mechanical Properties of SiC Fiber-Reinforced Reaction-Bonded Si3N4 Composites.

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Abstract:

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.

Author(s):
Bhatt, R. T.
Author Organization(s):
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CENTER
Descriptive Note:
Technical memo.,
Pagination:
0014

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
NASA-E-2671, NASA-TM-87085
Monitor Series:
TM-87085, TR-85-C-14
 Subject Terms
Joint Capability Areas:
JCA_1_Force Support; JCA_1.2_Force Preparation; JCA_5_Command and Control; JCA_1.2.3_Educating; JCA_5.3_Planning; JCA_6_Net Centric
Modernization Areas:
Microelectronics
Communities of Interest:
Advanced Electronics
Descriptor(s):
*FIBER REINFORCED COMPOSITES, *CERAMIC MATERIALS, STRESSES, DIAMETERS, VOLUME, FIBERS, MECHANICAL PROPERTIES, TENSILE STRENGTH, MICROSTRUCTURE, POWDERS, COMPOSITE MATERIALS, FABRICATION, CARBIDES, BENDING, STRENGTH(MECHANICS), FRACTURE(MECHANICS), STRENGTH(GENERAL), REFRACTION, SILICON COMPOUNDS, SILICON NITRIDES, SHEAR STRENGTH
Field(s)/Group(s):
Ceramics, Refractories and Glass, Laminates and Composite Materials
Report Date:
1985 Jan 01