Influence of fiber content on mechanical performance of SiC-fiber-reinforced reaction-bonded silicon nitride composites

Technical Report · Sun Jan 01 04:00:00 EST 1995

OSTI ID:46606

Singh, D; Singh, J P ^[1]; Bhatt, R T ^[2]

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1. Argonne National Lab., IL (United States). Energy Technology Div.
2. National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center

The effect of fiber content on the resulting mechanical properties (first matrix cracking stress, ultimate strength, and work-of-fracture) of silicon carbide (SiC)-fiber-reinforced reaction-bonded silicon nitride (RBSN) matrix composites was investigated. Flexure tests were used to evaluate mechanical properties of composites containing various fiber contents. The first matrix cracking stress, ultimate strength, and work-of-fracture of the composites increased with increasing fiber content, reaching a peak value at a fiber content of {approximately} 16 vol.%. Further increases in fiber content degraded the mechanical properties of the composites. The variations in mechanical properties with fiber contents were correlated to the residual stresses in the matrix phase, processing related flaws, and failure modes observed in these composites.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 46606
• Report Number(s): ANL/ET/CP--83786; CONF-950129--5; ON: DE95009903
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPOSITE MATERIALS
CONCENTRATION RATIO
EXPERIMENTAL DATA
FIBERS
FLEXURAL STRENGTH
FRACTURE PROPERTIES
MECHANICAL PROPERTIES
MECHANICAL TESTS
SHEAR PROPERTIES
SILICON CARBIDES
SILICON NITRIDES