The influence of Fe2O3 doping on the pore structure and mechanical strength of TiO2-containing alumina obtained by freeze-casting

Silva, Alysson M. A., Nunes, Eduardo H. M., Souza, Douglas F., Martens, Dana L., Diniz da Costa, Joao C., Houmard, Manuel and Vasconcelos, Wander L. (2015) The influence of Fe2O3 doping on the pore structure and mechanical strength of TiO2-containing alumina obtained by freeze-casting. Ceramics International, 41 10: 14049-14056. doi:10.1016/j.ceramint.2015.07.021

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Author Silva, Alysson M. A.
Nunes, Eduardo H. M.
Souza, Douglas F.
Martens, Dana L.
Diniz da Costa, Joao C.
Houmard, Manuel
Vasconcelos, Wander L.
Title The influence of Fe2O3 doping on the pore structure and mechanical strength of TiO2-containing alumina obtained by freeze-casting
Formatted title
The influence of Fe2O3 doping on the pore structure and mechanical strength of TiO2-containing alumina obtained by freeze-casting
Journal name Ceramics International   Check publisher's open access policy
ISSN 0272-8842
1873-3956
Publication date 2015
Sub-type Article (original research)
DOI 10.1016/j.ceramint.2015.07.021
Open Access Status File (Author Post-print)
Volume 41
Issue 10
Start page 14049
End page 14056
Total pages 8
Place of publication Kidlington, Oxford, United Kingdom
Publisher Elsevier
Collection year 2016
Language eng
Formatted abstract
This work investigated TiO2/Fe2O3 doped alumina prepared by the freeze-casting technique and using camphene as the solvent. Dendritic pores were formed in the TiO2 doped alumina, a structure conferred by the frozen camphene. Contrary to this trend, further Fe2O3 doping of TiO2-containing alumina resulted in the formation of non-dendritic structures. This behavior was attributed to the higher density of α-Fe2O3 (5.24 g cm−3) when compared to α-Al2O3 (3.95 g cm−3) and anatase TiO2 (3.89 g cm−3), which reduced critical solidification front velocity, thus forming material with different pore shape. Fe2O3 doping also improved the densification of TiO2–alumina and inhibited the formation of cracks, reflected by superior mechanical strength with best results ~150% higher for 10% Fe2O3 loaded samples as compared to TiO2–alumina samples.
Keyword A. Porosity
B. Strength
C. Al2O3
D. TiO2
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2016 Collection
 
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