Abstract
An X-ray diffraction technique for measuring the Bacon anisotropy factor of pyrocarbon coatings deposited on spherical fuel particles for high temperature reactors has been developed. Using an X-ray microbeam measurements can be made directly on single particles and, after correction for X-ray absorption by the specimen, the BAF can be calculated for individual coatings. Results on initially isotropic coatings deposited on dummy particles irradiated at 1400°C to a fluence of 4.8 × 10 21 n.cm −2 (EDN) show that the BAF increases with increasing creep strain. The largest increase in BAF from 1.01 to 1.26 was observed for the pyrocarbon coating with the lowest initial density of 1.66 g.cm −3.
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