Creep of mullite composites containing zirconia and silicon carbide whiskers

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:531146

Hynes, A; Doremus, R H ^[1]; Ruh, R ^[2]

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1. Rensselaer Polytechnic Institute, Troy, NY (United States)
2. Universal Technology Corp., Beavercreek, OH (United States); and others

The compressive creep rate of alkoxide-derived mullite and mullite-zirconia-SiC whiskers was measured at constant stress (50 MPa) and from 1290 to 1481{degrees}C. These composites were made by sol-gel methods, and hot pressed. The creep rate of the composite was about ten times slower than that of the material without the fibers. TEM micrographs of the composite after creep showed debonding and microcracks in the mullite matrix that did not pass through the SiC whiskers. The lower creep rate of the composite can be attributed to the blocking of the microcracks and possibly to the higher elastic modulus of the SiC as compared to the mullite.

• OSTI ID: 531146
• Report Number(s): CONF-9604124--; CNN: Grant N00014-96-1-0238
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPRESSION STRENGTH
CREEP
MULLITE
REINFORCED MATERIALS
SILICON CARBIDES
TEMPERATURE RANGE 1000-4000 K
WHISKERS
ZIRCONIUM OXIDES