Fabrication and properties of Si sub 3 N sub 4 composites reinforced by SiC whiskers and particles

Conference · Sun Oct 01 04:00:00 EDT 1989 · Ceramic Engineering and Science Proceedings; (USA)

OSTI ID:7144280

Kodama, Hironori; Miyoshi, Tadahiko

Effects of adding SiC in both the whisker and particulate forms as reinforcing materials to Si3N4 matrix ceramics on composite properties were investigated. The maximum fracture toughness of these composites was 10.5 MPa sq rt m, and flexural strength was 550 MPa for addition of 20 vol pct of SiC whiskers and 10 vol pct of SiC particles having an average particle size of 40 microns. Reinforcing mechanisms observed in these composites were crack deflection and crack branching by SiC particles and pullout of SiC whiskers. The effectiveness of utilizing two different reinforcing mechanisms together, that is, the mechanisms acting on the crack front (crack deflection, crack branching, and crack-pinning) and the mechanism of fiber pullout, for improving fracture toughness of composites was demonstrated. 5 refs.

• OSTI ID: 7144280
• Report Number(s): CONF-890130--
• Conference Information: Journal Name: Ceramic Engineering and Science Proceedings; (USA) Journal Volume: 10
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
CARBIDES
CARBON COMPOUNDS
CERAMICS
COMPOSITE MATERIALS
COMPUTER-AIDED MANUFACTURING
CRACKS
CRYSTALS
FABRICATION
FRACTURE PROPERTIES
MANUFACTURING
MATERIALS
MATRIX MATERIALS
MECHANICAL PROPERTIES
MONOCRYSTALS
NITRIDES
NITROGEN COMPOUNDS
PNICTIDES
REINFORCED MATERIALS
SILICON CARBIDES
SILICON COMPOUNDS
SILICON NITRIDES
WHISKERS