Effect of titania addition on the properties of freeze-cast alumina samples

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) Effect of titania addition on the properties of freeze-cast alumina samples. Ceramics International, 41 9, Part A: 10467-10475. doi:10.1016/j.ceramint.2015.04.132

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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 Effect of titania addition on the properties of freeze-cast alumina samples
Journal name Ceramics International   Check publisher's open access policy
ISSN 0272-8842
Publication date 2015-05-01
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.ceramint.2015.04.132
Open Access Status File (Author Post-print)
Volume 41
Issue 9, Part A
Start page 10467
End page 10475
Total pages 9
Publisher Pergamon Press
Collection year 2016
Language eng
Formatted abstract
This work investigated the behavior of TiO2-containing α-Al2O3 samples prepared by the freeze-casting technique. Camphene and liquid nitrogen were used as the solvent and cooling fluid, respectively. Camphene resulted in the formation of dendritic pores, in the direction of the freeze-casting cold front during sample preparation. The formation of β-Al2TiO5 phase occurred at 1300 °C, and became more evident as the sintering temperatures reached 1500 °C. The TiO2 loading did not affect the sample porosity at a given temperature, but it was detrimental in the case of mechanical properties under certain conditions. For instance, the flexural strength slightly improved with increasing the TiO2 loading and sintering temperature from 1100 to 1300 °C. This effect was attributed to the occurrence of a more effective sintering of alumina. However, as the heat treatment temperature was raised from 1300 to 1500 °C, the flexural strength did not increase as a function of the TiO2 loading, even though the densification occurred with loss of porosity. The loss of mechanical strength was found to be associated with the formation of microcracks which stemmed from the formation of β-Al2TiO5 phase for TiO2 loadings in excess of 4 wt% at these high sintering temperatures.
Keyword B. Porosity
D. Al2O3
D. TiO2
D. Al2TiO5
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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