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The safety and performance of the fuel of the high temperature reactor is largely controlled by the anisotropy of the pyrolytic carbon (PyC) coatings in the tristructural isotropic (TRISO) coated fuel particles and the graphite matrix of its fuel compacts. The optical anisotropy factor (OPTAF) and diattenuation of several PyC coatings were characterised by two modulator generalised ellipsometry microscopy...
The anisotropy of pyrolytic carbon is one of the most important properties for the development of TRISO (tristructural isotropic) coated fuel particles. Polarized Raman spectroscopy has been used to measure the anisotropy of pyrolytic carbon coatings ranging from high (highly oriented pyrolytic graphite) to low texture samples. Values obtained were correlated to the texture measured from the orientation...
The effect of deposition temperature and precursor concentration on the microstructure of pyrolytic carbon (PyC) has been studied by using SEM, TEM, Raman spectroscopy, X-ray diffraction and porosimetry. PyC was produced by fluidized bed chemical vapor deposition (FBCVD) at deposition temperatures from 1250 to 1450°C and with acetylene and acetylene/propylene mixtures at different concentrations....
Pyrolytic carbon coatings were deposited on top of alumina particles at deposition temperatures from 1250°C to 1450°C and with acetylene and acetylene/propylene mixtures at concentrations between 25% and 70%, v/v. The anisotropy of pyrolytic carbon coatings was quantified using electron diffraction and Raman peak intensities, and related to the deposition conditions and microstructure. In correlation...
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