Light extinction in metallic powder beds: Correlation with powder structure

A theoretical correlation between the effective extinction coefficient, the specific surface area, and the chord length distribution of powder beds is verified experimentally. The investigated powder beds consist of metallic particles of several tens of microns. The effective extinction coefficients...

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Bibliographic Details
Published in:Journal of applied physics 2005-07, Vol.98 (1), p.013533-013533-9
Main Authors: Rombouts, M., Froyen, L., Gusarov, A. V., Bentefour, E. H., Glorieux, C.
Format: Article
Language:English
Subjects:
COPPER
CORRELATION FUNCTIONS
DIFFRACTION
IRON
LASERS
LIGHT TRANSMISSION
MATERIALS SCIENCE
MORPHOLOGY
PARTICLE SIZE
PARTICLES
POWDERS
STAINLESS STEELS
WAVELENGTHS
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Summary:A theoretical correlation between the effective extinction coefficient, the specific surface area, and the chord length distribution of powder beds is verified experimentally. The investigated powder beds consist of metallic particles of several tens of microns. The effective extinction coefficients are measured by a light-transmission technique at a wavelength of 540 nm . The powder structure is characterized by a quantitative image analysis of powder bed cross sections resulting in two-point correlation functions and chord length distributions. The specific surface area of the powders is estimated by laser-diffraction particle-size analysis and by the two-point correlation function. The theoretically predicted tendency of increasing extinction coefficient with specific surface area per unit void volume is confirmed by the experiments. However, a significant quantitative discrepancy is found for several powders. No clear correlation of the extinction coefficient with the powder material and particle size, and morphology is revealed, which is in line with the assumption of geometrical optics.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1948509