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HomeKey Engineering MaterialsKey Engineering Materials Vol. 778Thermo-Physical Properties Measurement of Advanced...

Thermo-Physical Properties Measurement of Advanced TBC Materials with Pyrochlore and Perovskite Structures

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Abstract:

Thermal barrier coatings (TBCs) serve as thermal insulator in the hot region of an aircraft engine. Besides this, it also protects the underlying metal surface from the harsh corrosive and eroding environment. The associated lower thermal conductivity of TBC ceramic materials plays an important role in the improvement of thermal efficiency of the engine in term of increased combustion temperature and power. The thermal conductivity of the conventional yttria stabilized zirconia (YSZ) and three advanced ceramic materials with perovskite (CaZrO₃) and pyrochlore structure (La_0.75Nd_0.25)₂Zr₂O₇ & Nd₂Ce₂O₇) have been determined using differential scanning calorimetry (DSC). With thin metallic disk on the ceramic samples of different heights were heated / scanned using a standard DSC apparatus. The results were evaluated for the thermal conductivity measurement using well established procedure /calculations. The analyzed results were compared with that of other techniques given by other researchers and found to be in good agreement with an error of 10-15%. The result of coefficient of thermal expansion (CTE) that was measured using a dilatometer up to 1273°K has also given.

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Superalloys II

Advanced Materials – XV

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Periodical:

Key Engineering Materials (Volume 778)

Pages:

236-244

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.778.236

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Cite this paper

Online since:

September 2018

Authors:

Noveed Ejaz*, Liaqat Ali, Akhlaq Ahmad, Muhammad Mansoor, Muhammad Muneeb Asim, Abdul Rauf, K. Mehmood

Keywords:

Perovskite, Pyrochlore, TEC, Thermal Conductivity, YSZ

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Creative Commons CC BY 4.0

* - Corresponding Author

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