A preceramic polymer route to molded SiC ceramic parts
A polysilazane preceramic polymer, which yields amorphous Si-N-C ceramic material when pyrolyzed, was investigated as a binder for SiC powder in dry pressing formulations. For formulations containing 15-30 wt pct polysilazane binder, the nonoxidative thermal crosslinking/pyrolysis of the molded parts at up to 1300 C produced an SiC-particulate composite material in which the dominant microstructural feature was a high level of nanoporosity in the Si-N-C matrix phase. Ongoing efforts to characterize the mechanical, physical, and microstructural properties of these ceramic materials are discussed. Preliminary work on the fabrication of several structural ceramic parts is also presented to illustrate the unique processing characteristics of these materials. 5 refs.
- OSTI ID:
- 5949919
- Report Number(s):
- CONF-910162--
- Journal Information:
- Ceramic Engineering and Science Proceedings; (United States), Journal Name: Ceramic Engineering and Science Proceedings; (United States) Vol. 12; ISSN 0196-6219; ISSN CESPD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
BINDERS
CARBIDES
CARBON COMPOUNDS
CERAMICS
CHEMICAL REACTIONS
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
DECOMPOSITION
FABRICATION
MATERIALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
MOLDING
ORGANIC COMPOUNDS
ORGANOMETALLIC COMPOUNDS
PHYSICAL PROPERTIES
POLYMERS
POWDERS
PYROLYSIS
SILICON CARBIDES
SILICON COMPOUNDS
THERMOCHEMICAL PROCESSES