CEMHTI - Conditions Extrêmes et Matériaux : Haute Température et Irradiation
UPR3079 CNRS

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2016

ACL
doi HAL
D.De Sousa Meneses, M.Balat-Pichelin, O.Rozenbaum, L.del Campo, P.Echegut
Optical indices and transport scattering coefficient of pyrolytic boron nitride: a natural thermal barrier coating for solar shields
J. Mater. Sci. 51 4660-4669 (2016) [view,doi,HAL]

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.