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Non-destructive evaluation of ceramic porosity using terahertz time-domain spectroscopy

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 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.
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https://hal.archives-ouvertes.fr/hal-03525103
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Submitted on : Thursday, January 13, 2022 - 4:23:53 PM
Last modification on : Wednesday, January 26, 2022 - 3:40:42 AM
Long-term archiving on: : Thursday, April 14, 2022 - 9:56:53 PM

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Davit Hakobyan, Maher Hamdi, Olivier Redon, Anthony Ballestero, Alexis Mayaudon, et al.. Non-destructive evaluation of ceramic porosity using terahertz time-domain spectroscopy. Journal of the European Ceramic Society, Elsevier, 2022, 42 (2), pp.525-533. ⟨10.1016/j.jeurceramsoc.2021.10.026⟩. ⟨hal-03525103⟩

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