Fracture Mechanical Modelling of a Plasma Sprayed TBC System
2009 (English)In: Advanced Ceramic Coatings and Interfaces IV / [ed] Dongming Zhu and Hua-Tay Lin, Westerville, OH, United States: American Ceramic Society Inc. , 2009, Vol. 30, no 3, 113-124 p.Conference paper (Refereed)
A thermal barrier coating (TBC) system subjected to thermal cycling will develop a microcrack partem near the interface between the metallic bond coat and the ceramic top coat. These small cracks link up and form internal TBC delaminations during repeated heating / cooling. After a longer time period, the internal delamination cracks will form a larger spallation damage, where the TBC is detached from the underlying material. Since cracks are initiated in multiple sites of the thermal barrier coating, the damage is initially considered to be governed by local stress conditions. The purpose of the present work is to compare experimental data with predictions of a physically based fatigue life model. The present study has been performed on plasma-sprayed TBCs where the interface geometry has been varied. In the present work, calculation of fatigue life is done for a number of cases under thermal fatigue loading. Different interface geometries are compared in order to understand the influence of variations in the TC/BC interface roughness on oxidation behaviour and thermal fatigue life. Thermal fatigue tests indicate that an increased surface roughness is beneficial from a fatigue life point of view.
Place, publisher, year, edition, pages
Westerville, OH, United States: American Ceramic Society Inc. , 2009. Vol. 30, no 3, 113-124 p.
, Ceramic Engineering and Science Proceedings, ISSN 0196-6219 ; 3
Fracture mechanical modelling, thermal barrier coating, plasma spraying, thermal cycling, metallic bond coat
IdentifiersURN: urn:nbn:se:liu:diva-57007DOI: 10.1002/9780470584293.ch12ISI: 000281124900012ISBN: 978-0-470-45753-5OAI: oai:DiVA.org:liu-57007DiVA: diva2:324089
33rd International Conference on Advanced Ceramics and Composites, Daytona Beach, FL, USA, January 18-23, 2009