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Comparison of Damage Evolution During Thermal Cycling in a High Purity Nano and Conventional Thermal Barrier Coating
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, Faculty of Science & Engineering.
(Beijing General Reseach Institute of Mining and Metallurgy, Beijing, China)
(Siemens Industrial Turbomachinery AB, Finspång)
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2017 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347Article in journal (Refereed) Published
Abstract [en]

Thermal barrier coatings (TBCs), consisting of a ceramic top coat and a metallic bond coat, offer resistance against high temperature degradation of turbine components. Cyclic oxidation of the bond coat, thermal stresses due to their thermal mismatches during cyclic operations, and sintering of the top coat are considered to be the common ways by which thermal barrier coatings fail. To reduce sintering, a nano structured high purity yttria stabilized zirconia (YSZ) was developed. The focus of this work is to compare the damage development of such high purity nano YSZ TBC during thermal cycling with a conventional YSZ TBC. Thermal cyclic fatigue (TCF) tests were conducted on both the TBC systems between 100 °C and 1100 °C with a 1 h hold time at 1100 °C. TCF test results showed that conventional YSZ TBC exhibited much higher life compared to the high purity nano YSZ TBC. The difference in the lifetime is explained by the use of microstructural investigations, crack length measurements along the cross-section and the difference in the elastic modulus. Furthermore, stress intensity factors were calculated in order to understand the difference(s) in the damage development between the two TBC systems.

Place, publisher, year, edition, pages
Elsevier, 2017.
Keyword [en]
High purity nano, damage evolution, thermal cycling fatigue, crack length measurement, conventional TBC
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:liu:diva-142311DOI: 10.1016/j.surfcoat.2017.09.069Scopus ID: 2-s2.0-85030751243OAI: oai:DiVA.org:liu-142311DiVA: diva2:1152582
Available from: 2017-10-25 Created: 2017-10-25 Last updated: 2017-11-21Bibliographically approved

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Jonnalagadda, Krisha PraveenEriksson, RobertPeng, Ru Lin

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Jonnalagadda, Krisha PraveenEriksson, RobertPeng, Ru Lin
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