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Microcomposite and Nanocomposite Structures from Chemical Vapor Deposition in the Silicon–Titanium–Carbon System
Author(s) -
Touanen Muriel,
Teyssandier Francis,
Ducarroir Michel,
Maline Mohammed,
Hillel Roger,
Derep Jean Luc
Publication year - 1993
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1993.tb03928.x
Subject(s) - nanocomposite , materials science , chemical vapor deposition , amorphous solid , carbon fibers , microstructure , chemical engineering , silicon , deposition (geology) , titanium , chemical composition , amorphous carbon , transmission electron microscopy , composite material , composite number , nanotechnology , metallurgy , chemistry , crystallography , organic chemistry , paleontology , sediment , engineering , biology
Microcomposite and nanocomposite structures composed of SiC‐TiC and C have been prepared by chemical vapor deposition at atmospheric pressure (APCVD) from an initial gaseous mixture with the composition C 4 H 10 ‐SiH 2 Cl 2 ‐TiCl 4 ‐H 2 . Transmission electron microscopy reveals that deposits with a nanocomposite structure consist of a network of 10‐nm‐thick needles surrounded by small areas of amorphous carbon. The relative amounts of TiC and SiC as well as the microstructure depend on the SiH 2 Cl 2 and TiCl 4 content in the initial gas‐phase mixture. The variations of composition of the deposits are in good accordance with the thermodynamic calculations. Amorphous carbon is always present in the deposits. This amount can be lowered to 1 at.% at low deposition temperatures but, at such a concentration, still has a great influence on microhardness. The variation of the preferred orientation of crystals is also discussed with respect to the composition of the samples and the deposition temperature.