Preparation of silicon carbide-silicon nitride fibers by the pyrolysis of polycarbosilazane precursors - a review

Journal Article · Mon Sep 01 00:00:00 EDT 1986 · Polym. Eng. Sci.; (United States)

DOI:https://doi.org/10.1002/pen.760261705· OSTI ID:6764035

Penn, B G; Daniels, J G; Ledbetter, III, F E; Clemons, J M

The development of silicon carbide-silicon nitride fibers (SiC-Si3N4) by the pyrolysis of polycarbosilazane precursors is reviewed. Precursor resin, which was prepared by heating tris(N-methylamino)methylsilane or tris(N-methylamino)phenylsilane to about 520 C, was drawn into fibers from the melt and then made unmeltable by humidity conditioning at 100 C and 95 percent relative humidity. The humidity treated precursor fibers were pyrolyzed to ceramic fibers with good mechanical properties and electrical resistivity. For example, SiC-Si3N4 fibers derived from tris(N-methylamino)methylsilane had a tensile rupture modulus of 29 million psi and electrical resistivity of 6.9 x ten to the 8th power omega-cm, which is ten to the twelfth power times greater than that obtained for graphite fibers. 13 refs.

• Research Organization: NASA, Marshall Space Flight Center, Huntsville, AL
• OSTI ID: 6764035
• Journal Information: Polym. Eng. Sci.; (United States), Vol. 26:17
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
SILICON CARBIDES
SYNTHESIS
SILICON NITRIDES
CERAMICS
ELECTRIC CONDUCTIVITY
FIBERS
MONOMERS
ORGANIC SILICON COMPOUNDS
POLYCARBONATES
POLYMERIZATION
PYROLYSIS
TENSILE PROPERTIES
CARBIDES
CARBON COMPOUNDS
CARBONATES
CHEMICAL REACTIONS
DECOMPOSITION
ELECTRICAL PROPERTIES
MECHANICAL PROPERTIES
NITRIDES
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
SILICON COMPOUNDS
THERMOCHEMICAL PROCESSES
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication