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Optical indices and transport scattering coefficient of pyrolytic boron nitride: a natural thermal barrier coating for solar shields

Abstract : Absorption and scattering properties of pyrolytic boron nitride (pBN) have been characterized by infrared spectroscopy. The strong dielectric anisotropy predicted by first principles calculations is confirmed by measurements performed on a highly oriented pBN sample. Optical properties of textured samples elaborated by chemical vapor deposition were identified from normal hemispherical reflectance and transmittance spectra by applying modified two-flux and four-flux transport models. It is also shown that coating carbon–carbon composites used to build solar shields with a pBN layer having an optimal thickness could improve the protection performance.
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Submitted on : Friday, March 4, 2016 - 4:16:29 PM
Last modification on : Wednesday, September 23, 2020 - 4:38:46 AM
Long-term archiving on: : Sunday, June 5, 2016 - 10:41:04 AM

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Domingos de Sousa Meneses, Marianne Balat-Pichelin, Olivier Rozenbaum, Leire del Campo, Patrick Echegut. Optical indices and transport scattering coefficient of pyrolytic boron nitride: a natural thermal barrier coating for solar shields. Journal of Materials Science, Springer Verlag, 2016, 51 (9), pp.4660-4669. ⟨10.1007/s10853-016-9781-2⟩. ⟨insu-01280535⟩

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