Non-destructive evaluation of ceramic porosity using terahertz time-domain spectroscopy
ABRAHAM, Emmanuel
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
Direction de Recherche Technologique (CEA) [DRT (CEA)]
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Laboratoire Ondes et Matière d'Aquitaine [LOMA]
Direction de Recherche Technologique (CEA) [DRT (CEA)]
Language
en
Article de revue
This item was published in
Journal of the European Ceramic Society. 2022, vol. 42, n° 2, p. 525-533
Elsevier
English Abstract
Dielectric constants of Al 2 O 3 (alumina) ceramic samples have been measured with non-destructive terahertz time-domain spectroscopy. Using an effective medium approximation, we demonstrated that the relative permittivity ...Read more >
Dielectric constants of Al 2 O 3 (alumina) ceramic samples have been measured with non-destructive terahertz time-domain spectroscopy. Using an effective medium approximation, we demonstrated that the relative permittivity can be used to evaluate the porous alumina samples, with porosity fractions ranging from 0% to 20% per volume. This result makes it possible to control sample porosity, a key material parameter related to mechanical strength under compression load, hardness and wear resistance, or thermal stability. We also employed terahertz time-domain spectroscopy to differentiate alumina samples fabricated with different grain sizes, or reveal a small fraction of impurities, such as 5% vol of ZrO 2 , embedded in non-porous alumina. These results demonstrated the potential of terahertz radiation for non-destructive characterization of low loss high dielectric constant ceramics.Read less <
English Keywords
Porosity evaluation
aluminum oxide Al 2 O 3
ceramics
non-destructive evaluation
dielectric properties
terahertz time-domain spectroscopy
Origin
Hal imported