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(Ln~0.9~Gd~0.05~Yb~0.05~)~2~Zr~2~O~7~ Ceramics with Pyrochlore Structure as Thermal Barrier Oxides by Z.-G. Liu; J.-H. Ouyang; Y. Zhou; J. Li; X.-L. Xia is a Engineering article available to read on EtoBox.

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Ceramic thermal barrier coatings (TBCs) used for thermal insulation against hot combustion gases greatly enhance operating temperatures and thermal efficiency of hot-section components in gas-turbine engines, and reduce fuel consumption and gas emissions at elevated temperatures. [1][2][3] Up to now, the most successful TBC materials in use are 7 ± 1 wt.%Y 2 O 3 stabilized ZrO 2 (7YSZ). However, 7YSZ is limited to operate below 1200 °C. Above 1200 °C, the t'-phase zirconia transforms into tetragonal and cubic phases. During cooling the tetragonal phase will further transform into monoclinic phase, which is accompanied with a volume change of 3-5 % and invariably causes cracking and failure. The relatively porous 7YSZ plasma-sprayed coatings are prone to sintering above 1200 °C, which increases thermal conductivity and makes them less effective. To further improve the thermal insulation properties, it is urgently needed to develop new thermal barrier oxide materials with a lower thermal conductivity than 7YSZ. Some important requirements for excellent TBC materials are high melting point, high phase stability, low thermal conductivity, chemical inertness, high thermal expansion coef

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Author

Z.-G. Liu; J.-H. Ouyang; Y. Zhou; J. Li; X.-L. Xia

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Ltd.; Wiley (ISSN 1438-1656)

Published

2008

Language

EN

Field

Engineering (Physical Sciences)