Evaluation of SiC platelets as a reinforcement for oxide matrix composites

Conference · Thu Aug 01 04:00:00 EDT 1991 · Ceramic Engineering and Science Proceedings; (United States)

OSTI ID:6107889

Baril, D; Jain, M K

Composites were fabricated using three sizes of SiC platelets and two sources of alumina by wet mixing followed by hot pressing at 1500 C, and 55 MPa in an argon atmosphere. Densities over 99 percent of the theoretical were obtained with up to 30 vol pct loading. The microstructural studies of these composites showed uniform distribution of platelets with little or no porosity.Significant matrix grain growth was observed at low platelet loading irrespective of their size, wheres matrix cracks were observed in composites of larger platelets especially at high loading. The best combination of fracture toughness and flexural strength, 7.9 MPa sq rt of m and 350 MPa, respectively, was obtained with the finest grade platelets with an average particle size of 11 microns. The predominant toughening mechanism was crack deflection caused by the platelets as well as matrix grains. 22 refs.

• OSTI ID: 6107889
• Report Number(s): CONF-910162--
• Conference Information: Journal Name: Ceramic Engineering and Science Proceedings; (United States) Journal Volume: 12
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
360603 -- Materials-- Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
FABRICATION
FLEXURAL STRENGTH
FRACTURE PROPERTIES
GRAIN GROWTH
GRAIN SIZE
HOT PRESSING
INERT ATMOSPHERE
MATERIALS
MATERIALS WORKING
MECHANICAL PROPERTIES
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PARTICLES
PARTICULATES
POROSITY
PRESSING
SILICON CARBIDES
SILICON COMPOUNDS
SIZE