Thermal barrier coatings investigated
Friday, 22 October 2010
An overview on thermal barrier coatings compares different new materials covering especially doped zirconia, pyrochlores, perovskites, and aluminates.
Research on ceramic materials as thermal barrier coatings has been made Source: Alexander Raths - Fotolia.com
During the last decade a number of ceramic materials, mostly oxides have been suggested as new thermal barrier coating (TBC) materials. These new compositions have to compete with the state-of-the-art TBC material yttria stabilised zirconia (YSZ) which turns out to be difficult due to its unique properties. On the other hand YSZ has certain shortcomings especially its limited temperature capability above 1200 °C which necessitates its substitution in advanced gas turbines. In a paper to be published in the November issue of "Surface and Coatings Technology" an overview is tried on different new materials covering especially doped zirconia, pyrochlores, perovskites, and aluminates. Literature results and research investigations made by the authors will be presented and compared to the requirements. Finally, the double-layer concept, a method to overcome the limited toughness of new TBC materials, will be discussed.
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