Production of silicon nitride/silicon carbide fibrous composites using polysilazanes as pre-ceramic binders

Conference · Wed Aug 01 04:00:00 EDT 1990 · Ceramic Engineering and Science Proceedings; (USA)

OSTI ID:6189767

Mohr, D L; Desai, P; Starr, T L

Advanced ceramic composites having a reaction-bonded silicon nitride (RBSN) matrix, derived from submicron silicon powders and various SiC fiber reinforcements, are discussed. The addition of a preceramic binder (i.e., a polysilazane copolymer) improved the density and changed some of the other properties of these composites, e.g., processability, porosity, morphology, and crystallinity of the product. The preliminary results indicated that a stabilization step is needed to obtain acceptable yield. The polysilazanes were pyrolyzed in a tube furnace under a flow of nitrogen, ramping to 800 deg at 1 deg/min. The reaction-bonding experiments were performed in a computer-controlled nitriding system, ramping from 1100 deg to 1200 deg at 1/2 deg/min. 5 refs.

• OSTI ID: 6189767
• Report Number(s): CONF-900160--
• Conference Information: Journal Name: Ceramic Engineering and Science Proceedings; (USA) Journal Volume: 11
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601* -- Other Materials-- Preparation & Manufacture
BINDERS
BONDING
CARBIDES
CARBON COMPOUNDS
CERAMICS
COMPOSITE MATERIALS
COPOLYMERS
CRYSTALS
FABRICATION
FIBERS
JOINING
MATERIALS
MATRIX MATERIALS
METALLURGY
MONOCRYSTALS
NITRIDES
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PNICTIDES
POLYMERS
POWDER METALLURGY
SILICON CARBIDES
SILICON COMPOUNDS
SILICON NITRIDES
WHISKERS