Journal
APPLIED SURFACE SCIENCE
Volume 542, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.148553
Keywords
Plasma spraying; Al2O3-doped t-YSZ coatings; Electronic structure; Thermal property
Categories
Funding
- National Key R&D Program of China [2018YFB0704400]
- Shanghai Sailing Program [18YF1427000]
- Research Project of Shanghai Science and Technology Committee [19142200600]
- Shanghai Technical Platform for Testing on Inorganic Materials [19DZ2290700]
- National Nature Science Foundation of China [81672131, 81871754]
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In this study, Al2O3-doped tetragonal yttria-stabilized zirconia (t-YSZ) coatings were prepared by plasma spraying, showing that the addition of Al2O3 significantly affects the thermal properties of the coatings, improving insulation performance mainly by increasing the number of defects and boundary density.
Al2O3-doped tetragonal yttria-stabilized zirconia (t-YSZ) coatings were prepared by plasma spraying under various spraying parameters. The analysis of variance reveals that only Al2O3 addition significantly affects thermal properties of coatings. The electronic structures and microstructures results show that the increase in number of defects and boundary density with the increasing addition of Al2O3 enhances phonon scattering resulting in a decrease in the thermal conductivity, which suggests that the Al2O3 addition can improve the insulation performance of the YSZ coating. The increase in boundary density with the increase in Al2O3 addition is due to recrystallization resulting from the decreasing melting point of Al2O3-YSZ composites, lattice distortion, and the presence of amorphous structure and monoclinic Al2O3 pinning at grain boundaries. The change in the coefficient of thermal expansion with Al2O3 addition is attributable to the variation in the bonding strength of the Al2O3-doped t-YSZ caused by the change in lattice constants.
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