From preceramic polymers with interpenetrating networks to SiC/MC nanocomposites

Journal Article · Wed Mar 01 04:00:00 EST 2000 · Chemistry of Materials

DOI:https://doi.org/10.1021/cm991140e· OSTI ID:20050868

Corriu, R J.P.; Gerbier, P; Guerin, C; Henner, B

The preparation of {beta}-SiC/MC (M = Ti, Nb, and Ta) nanocomposite ceramics by the pyrolysis under an inert atmosphere of precursors consisting in interpenetrating networks of poly[(dimethylsilylene)diacetylene], 1, and polymeric metal oxide is described. The precursors are obtained by in-situ precipitation of the desired metal alkoxide into the organosilicon polymeric matrix. The precursor-to-ceramic conversion involved two critical transformations: (1) the thermal cross-linking of 1 and (2) the carbothermal reduction of the oxide by the free carbon resulting from the degradation of 1. At 1,400 C, the pure carbides are obtained as nanometer-sized highly crystalline powders. Analyses have shown that both {beta}-SiC and the other metal carbide are present simultaneously in each ceramic particle as discrete phases. All of these results show that the authors are faced with materials that can be described as nanocomposite ceramics with interpenetrating networks.

• Research Organization: Univ. Montpellier II (FR)
• OSTI ID: 20050868
• Journal Information: Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 3 Vol. 12; ISSN CMATEX; ISSN 0897-4756
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPOSITE MATERIALS
CROSS-LINKING
CRYSTAL STRUCTURE
INORGANIC POLYMERS
NIOBIUM CARBIDES
POLYACETYLENES
SILICON CARBIDES
TANTALUM CARBIDES
TITANIUM CARBIDES