SiC whisker/Si3N4 composites by a chemical mixing process

Conference · Tue Oct 01 00:00:00 EDT 1991 · Ceramic Engineering and Science Proceedings; (United States)

OSTI ID:6111728

Wang, Hongyu; Fischman, G S

A chemical mixing process has been developed for making SiC whisker/Si3N4 composites. The process involves in situ synthesis of SiC whiskers in Si3N4 powder by partial carbothermal reduction of silicon nitride in an argon atmosphere. The effects of reaction conditions and starting raw materials on the formation of SiC whiskers were studied. It has been demonstrated that the morphologies of the in situ synthesized whiskers can be modified by varying carbon-source materials and reaction conditions, and the amount of SiC formed in the product can be adjusted by changing the starting Si3N4-to-C ratio. The chemically mixed composite materials were densified by hot pressing with Y2O3 and Al2O3 as sintering aids. 12 refs.

• OSTI ID: 6111728
• Report Number(s): CONF-910162-; CODEN: CESPD
• Journal Information: Ceramic Engineering and Science Proceedings; (United States), Vol. 12; Conference: 15. annual conference on composites and advanced ceramics, Cocoa Beach, FL (United States), 13-16 Jan 1991; ISSN 0196-6219
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
SILICON CARBIDES
FABRICATION
SILICON NITRIDES
ARGON
COMPOSITE MATERIALS
FIBERS
HOT PRESSING
MIXING
MORPHOLOGY
RAW MATERIALS
SINTERING
SYNTHESIS
WHISKERS
CARBIDES
CARBON COMPOUNDS
CRYSTALS
ELEMENTS
FLUIDS
GASES
MATERIALS
MATERIALS WORKING
MONOCRYSTALS
NITRIDES
NITROGEN COMPOUNDS
NONMETALS
PNICTIDES
PRESSING
RARE GASES
SILICON COMPOUNDS
360601* - Other Materials- Preparation & Manufacture