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The synthesis of thermochemically stable single phase lanthanum titanium aluminium oxide

Zhang, P; Choy, K-L; (2016) The synthesis of thermochemically stable single phase lanthanum titanium aluminium oxide. Ceramics International , 42 (2 Pt B) pp. 3261-3267. 10.1016/j.ceramint.2015.10.117. Green open access

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Abstract

Lanthanum titanium aluminium oxide (LaTi2Al9O19, LTA) synthesized by solid state reaction has been proven to be a promising thermal barrier material. However, LTA synthesized via solid state reaction requires a high processing temperature of at least 1500 °C for 24 h. In this paper, single phase LTA was synthesized by sol–gel at a lower temperature (1350 °C) and the process parameters, phase composition, and relative thermal properties were investigated. Two-step calcination was used to obtain fine LTA powders. According to X-ray diffraction, the best calcination temperature of sol–gel synthesized LTA is 1350 °C. XRD results also showed the thermochemical stability of sol–gel synthesized LTA, which does not react with Al2O3 up to 1500 °C, to be excellent. Compared to LTA synthesized by solid state reaction, sol–gel synthesized LTA has higher coefficients of thermal expansion (CTEs) which are circa 10.2×10−6 °C−1 at 950 °C, related to the size dependent characteristic of CTEs. Therefore, sol–gel synthesized LTA can be a promising candidate as a thermal barrier material on Ni-based superalloys.

Type: Article
Title: The synthesis of thermochemically stable single phase lanthanum titanium aluminium oxide
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.ceramint.2015.10.117
Publisher version: http://dx.doi.org/10.1016/j.ceramint.2015.10.117
Language: English
Additional information: Copyright © 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Keywords: Science & Technology, Technology, Materials Science, Ceramics, Materials Science, Sol gel process, Calcination, Thermal properties, Thermal expansion, Thermal Barrier Coatings, Elastic Properties, Heat-treatment, Conductivity, Powders
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office > Institute for Materials Discovery
URI: https://discovery.ucl.ac.uk/id/eprint/1533033
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