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Research Papers: Nuclear Power

Deposition of TRISO Particles With Superhard SiC Coatings and the Characterization of Anisotropy by Raman Spectroscopy

[+] Author and Article Information
E. López-Honorato, P. J. Meadows, J. Tan, Y. Xiang

Materials Science Centre, School of Materials, University of Manchester, Grosvenor Street, Manchester M1 7HS, UK

P. Xiao1

Materials Science Centre, School of Materials, University of Manchester, Grosvenor Street, Manchester M1 7HS, UKping.xiao@manchester.ac.uk

1

Corresponding author.

J. Eng. Gas Turbines Power 131(4), 042905 (Apr 16, 2009) (4 pages) doi:10.1115/1.3095804 History: Received October 22, 2008; Revised October 24, 2008; Published April 16, 2009

In this work we have deposited silicon carbide (SiC) at 1300°C with the addition of small amounts of propylene. The use of propylene and high concentrations of methyltrichlorosilane (9vol%) allowed the deposition of superhard SiC coatings (42 GPa). The superhard SiC could result from the presence of a SiC–C solid solution, undetectable by X-ray diffraction but visible by Raman spectroscopy. Another sample obtained by the use of 50vol% Argon, also showed the formation of SiC with good properties. The use of a flat substrate together with the particles showed the importance of carrying out the analysis on actual particles rather than in flat substrates. We show that it is possible to characterize the anisotropy of pyrolytic carbon by Raman spectroscopy.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

SEM image of SiC produced at 1300°C and 9 vol % MTS and 0.5 vol % propylene

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Figure 2

3D image obtained by X-ray microtomography showing the isosurface of the IPyC/SiC interface and the SiC/OPyC interface. PyC coatings are not shown.

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Figure 3

Phase composition obtained by Raman spectroscopy of the SiC coating deposited at 1300°C

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Figure 4

Flat substrate and coated particles obtained during the deposition of SiC at 1400°C

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Figure 5

Differences in stoichiometry between SiC coatings produced on alumina particles and flat substrates

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Figure 6

Measurements of OA from FWHM of azimuthal intensity scan of selected area electron diffraction pattern

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Figure 7

Changes in the Raman spectra of PyC depending on the deposition conditions

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Figure 8

Texture obtained by TEM and its correlation to Raman signals

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