Next Article in Journal
Semiconducting Metal Oxides Nanocomposites for Enhanced Detection of Explosive Vapors
Previous Article in Journal
Deriving Principles of the Freeze-Foaming Process by Nondestructive CT Macrostructure Analyses on Hydroxyapatite Foams
Article Menu

Export Article

Open AccessArticle
Ceramics 2018, 1(1), 83-97; https://doi.org/10.3390/ceramics1010008

Alumina Porous Ceramics Obtained by Freeze Casting: Structure and Mechanical Behaviour under Compression

1
Belgian Ceramic Research Centre (BCRC), Avenue Gouverneur Cornez 4, B-7000 Mons, Belgium
2
UMONS—Institut Matériaux—Rue de l’Epargne 56, B-7000 Mons, Belgium
3
Instituto de Ceràmica y Vidrio, ICV-CSIC Kelsen 5, 28049 Madrid, Spain
4
Laboratoire des Matériaux Céramiques et Procédés Associés (LMCPA), UVHC, Boulevard Charles de Gaulle, F-59600 Maubeuge, France
*
Author to whom correspondence should be addressed.
Received: 18 April 2018 / Revised: 13 June 2018 / Accepted: 14 June 2018 / Published: 20 June 2018
Full-Text   |   PDF [8587 KB, uploaded 20 July 2018]   |  

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. View Full-Text
Keywords: freeze casting; ice templating; mechanical properties; strain mode; porosity gradient effect freeze casting; ice templating; mechanical properties; strain mode; porosity gradient effect
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Hautcoeur, D.; Gonon, M.; Baudin, C.; Lardot, V.; Leriche, A.; Cambier, F. Alumina Porous Ceramics Obtained by Freeze Casting: Structure and Mechanical Behaviour under Compression. Ceramics 2018, 1, 83-97.

Show more citation formats Show less citations formats

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Ceramics EISSN 2571-6131 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top