Experimental study of the chemical vapor deposition from CH3SiHCl2/H2: Application to the synthesis of monolithic SiC tubes

The aim of the present work is to synthesize high strength monolithic SiC tubes to improve the imperviousness of a SiC/SiC composite structure. A few hundred micrometer-thick tubular coatings were produced by chemical vapor deposition (CVD) at atmospheric pressure from CH3SiHCl2/Ar/H2 mixtures. The...

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Veröffentlicht in:Surface & coatings technology 2013-09, Vol.230, p.137-144
Hauptverfasser: Drieux, P., Chollon, G., Jacques, S., Allemand, A., Cavagnat, D., Buffeteau, T.
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container_end_page 144
container_issue
container_start_page 137
container_title Surface & coatings technology
container_volume 230
creator Drieux, P.
Chollon, G.
Jacques, S.
Allemand, A.
Cavagnat, D.
Buffeteau, T.
description The aim of the present work is to synthesize high strength monolithic SiC tubes to improve the imperviousness of a SiC/SiC composite structure. A few hundred micrometer-thick tubular coatings were produced by chemical vapor deposition (CVD) at atmospheric pressure from CH3SiHCl2/Ar/H2 mixtures. The CVD-SiC tubes were obtained by deposition on the inner walls of a SiO2-tube substrate, previously coated with a pyrocarbon interfacial layer to promote delamination. A continuous deposition process was developed to allow the realization of relatively long CVD-SiC tubes by sliding the heating system along the substrate. The chemical composition and the microstructure of the tubes were studied by electron probe microanalysis, Raman spectroscopy and scanning electron microscopy. The deposition rate, composition and microstructure of the CVD-SiC coatings were investigated as a function of the substrate temperature and the gas flow rates. A Fourier transformed infrared (FTIR) spectroscopy analysis was carried out at the reactor outlet to characterize the gas phase reactions. The FTIR analysis of pure species from the Si–C–Cl–H system as well as ab initio calculations at the density functional theory (DFT) level allowed the assignment of the main IR features in the experimental spectra and the quantitative analysis of the complex gas mixture. This study has led to the proposal of a simplified dichloromethylsilane decomposition scheme which is consistent with the influence of the CVD parameters on the nature of the gas phase and the coating. The deposition rate, the Si/C atomic ratio, the SiC crystalline state and the surface morphology are indeed strongly related to the CH3SiHCl2 decomposition rate and the further progress of homogeneous reactions. •Design of an original CVD reactor with mobile heating stage•Use of carbon-coated inner SiO2 tube wall as substrate•Synthesis of free standing CVD-SiC tubes•Recording and ab initio calculation of the IR spectra of various chlorosilanes•Correlation between deposition rate and composition of gas phase and deposit
doi_str_mv 10.1016/j.surfcoat.2013.06.046
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subjects Atmospheric pressure
Chemical Sciences
Chemical vapor deposition
Coatings
Cross-disciplinary physics: materials science
rheology
CVD
Deposition
Exact sciences and technology
Gas phase analysis
Gas phases
Material chemistry
Materials science
Microstructure
Nuclear fuel cladding
Physics
Scanning electron microscopy
Silicon carbide
Silicon dioxide
Surface treatments
Tubes
title Experimental study of the chemical vapor deposition from CH3SiHCl2/H2: Application to the synthesis of monolithic SiC tubes
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