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Cross‐sectional texture of carbon fibres analysed by scanning microbeam X‐ray diffraction
Author(s) -
Paris Oskar,
Loidl Dieter,
Müller Martin,
Lichtenegger Helga,
Peterlik Herwig
Publication year - 2001
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889801008330
Subject(s) - microbeam , texture (cosmology) , materials science , diffraction , mesophase , perpendicular , optics , cross section (physics) , composite material , x ray crystallography , geometry , physics , mathematics , computer science , optoelectronics , liquid crystal , quantum mechanics , artificial intelligence , image (mathematics)
Scanning microbeam X‐ray diffraction analysis of single carbon fibres allows the cross‐sectional orientation distribution (texture) of the carbon layers to be determined, even when the fibre axis is oriented perpendicular to the X‐ray beam (fibre geometry). The fibre is scanned across a microbeam with a diameter significantly smaller than the fibre diameter, and fibre diffraction patterns are recorded for every scanning step. The cross‐sectional texture information is obtained from the integrated intensities of two different equatorial reflections as a function of the position on the fibre. As an example, results from two different types of carbon fibres are presented: a polyacrylonitrile‐based fibre, with random cross‐sectional texture, and a fibre based on mesophase pitch, which exhibits a radially folded cross‐sectional texture. Detailed modelling of the diffraction data allows a quantitative description of the radial folded texture.