High temperature strength of SiC whisker-reinforced silicon nitride composites

Conference · Mon Jan 01 04:00:00 EST 1990

OSTI ID:6753808

Tiegs, T N; Becher, P F; Ferber, M K; Menchhofer, P A

The addition of SiC whiskers to Si{sub 3}N{sub 4}-based matrices results in improved flexural strength and fracture toughness at room temperature; however, at temperatures >1000{degree}C, the strength can be lower than that of the monolithic material. This effect is a function of the impurity content introduced by the whiskers and the affect of such impurities on the composition of the intergranular glass phase. Other factors affecting the high-temperature strength are whisker type and content. 5 refs., 3 figs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• Sponsoring Organization: DOE/CE
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6753808
• Report Number(s): CONF-900634-4; ON: DE90013822
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360603 -- Materials-- Properties
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
COMPOSITE MATERIALS
CRYSTALS
FLEXURAL STRENGTH
FRACTURE PROPERTIES
MATERIALS
MECHANICAL PROPERTIES
MONOCRYSTALS
NITRIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PNICTIDES
SILICON CARBIDES
SILICON COMPOUNDS
SILICON NITRIDES
TEMPERATURE EFFECTS
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE
WEAR
WHISKERS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES