Thermo-Physical Properties of Hexavalent Tungsten W<sup>6+</sup>-Doped Ta-Based Ceramics for Thermal/Environmental Barrier Coating Materials
The CaTa<sub>0.8</sub>WO<sub>6</sub> ceramic was fabricated by a solid-state reaction for thermal/environmental barrier coating (Thermal and Environmental Barrier Coating) applications, and the microstructures, mechanical and thermal properties were investigated. The result s...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-11-01
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| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/14/12/1368 |
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| Summary: | The CaTa<sub>0.8</sub>WO<sub>6</sub> ceramic was fabricated by a solid-state reaction for thermal/environmental barrier coating (Thermal and Environmental Barrier Coating) applications, and the microstructures, mechanical and thermal properties were investigated. The result showed CaTa<sub>0.8</sub>WO<sub>6</sub> has a lower thermal conductivity (1.05 W·m<sup>−1</sup>·K<sup>−1</sup> at 900 °C) than 8 wt.% yttria-stabilized zirconia and the doped Ta-based ceramics with Mg<sup>2+</sup>, Yb<sup>3+</sup>, Zr<sup>4+</sup> and Nb<sup>5+</sup>, indicating that hexavalent tungsten element W<sup>6+</sup> doping effectively reduces thermal conductivity and improves thermal insulation performance of Ta-based ceramics. The thermal expansion rates curve without inflection points resulting from phase transition indicates that CaTa<sub>0.8</sub>WO<sub>6</sub> has excellent high-temperature phase stability. Since the Young’s modulus and Pugh’s ratio of CaTa<sub>0.8</sub>WO<sub>6</sub> ceramics were lower than those of various valence states doping Ta-based ceramics, which means that CaTa<sub>0.8</sub>WO<sub>6</sub> has better damage tolerance. |
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| ISSN: | 2075-4701 |