Conditions Extrêmes et Matériaux : Haute Température et Irradiation
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2016
ACL
doi
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) doi:
10.1007/s10853-016-9781-2
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.