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Journal articles
Alumina Porous Ceramics Obtained by Freeze Casting: Structure and Mechanical Behaviour under Compression
Abstract : The aim of the work is to analyse the mechanical behaviour of anisotropic porous alumina ceramics processed by freeze casting (ice templating). The freeze cast specimens were characterised by a lamellar structure with ellipsoidal pore shape, with a size ranging from 6 to 42 µm and 13 to 300 µm for the minor and major axes, respectively, as a function of the freezing rate and the powder and binder contents. The pore volume fraction ranged from 40 to 57%. SEM analysis of the porous structures after the compression test showed a typical deformation pattern caused by the porosity gradient through the specimen, as determined by X-ray radiography. The apparent elastic modulus of the anisotropic porous alumina ranged from 0.2 to 14 GPa and the compressive strength from 6 to 111 MPa, varying as a function of the process parameters which determine the pore network characteristics. The relationships between stress-strain behaviour in compression and the microstructure and texture were established. An analytical model based on a Gibson and Ashby relationship was used and adapted from SEM microstructural analysis after a mechanical test in order to predict the compressive strength of processed anisotropic alumina.
https://hal-uphf.archives-ouvertes.fr/hal-03477168
Contributor : Kathleen Torck Connect in order to contact the contributor
Submitted on : Monday, December 13, 2021 - 12:39:58 PM
Last modification on : Friday, January 21, 2022 - 3:32:48 AM
Contributor : Kathleen Torck Connect in order to contact the contributor
Submitted on : Monday, December 13, 2021 - 12:39:58 PM
Last modification on : Friday, January 21, 2022 - 3:32:48 AM
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