Journal
CERAMICS INTERNATIONAL
Volume 45, Issue 13, Pages 16450-16457Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.05.176
Keywords
Gd2Zr2O7; Titanium; Pyrochlore; Fluorite; Thermal barrier coatings
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Funding
- CSIR India [01(2952)/18/EMR-II]
- Council of Scientific and Industrial Research (CSIR), India [09/559(0136)/19-EMR-I]
- Department of Science and Technology-Science and Engineering Research Board (DST-SERB), India [EMR/2015/002200]
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The study underlines the impact of Ti(4)(+)substitution in Gd2Zr2O7 for applications in thermal barrier coatings (TBC). Depending on the Ti4+ content, two different crystal structures of Gd2Zr2O7 namely pyrochlore and fluorite were determined. Ti4+ substitutions in the increasing order induced a gradual contraction of Gd2Zr2O7 unit cell; however, with the accomplishment of concentration dependent crystal structures of either single phase pyrochlore or mixtures of pyrochlore and fluorite. Absorption measurements enunciated the enhanced infra-red reflectance behaviour of Gd2Zr2O7 due to Ti4+ substitutions. A gradual increment in the concentration of Ti4+ substitutions in Gd2Zr2O7 envisaged a simultaneous porous to dense morphological features, which reflected in the resultant mechanical data. Hot corrosion studies ensure the critical role of Ti4+ to retain the crystal structure of Gd2Zr2O7.
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