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Hot gas corrosion and its influence on the thermal cycling performance of suspension plasma spray TBCs
Linköpings universitet, Konstruktionsmaterial.
Linköpings universitet, Konstruktionsmaterial.
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. Department of Engineering Science, University West, Trollhättan. (PTW)ORCID iD: 0000-0002-4201-668x
Siemens Industrial Turbomachinery AB, Finspång.
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2019 (English)In: Proceedings of ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition, New York, NY: American Society of Mechanical Engineers , 2019Conference paper, Published paper (Refereed)
Abstract [en]

Thermal barrier coatings (TBCs) manufactured with suspension plasma spray (SPS) are promising candidates for use in gas turbines due to their high strain tolerance during thermal cyclic fatigue (TCF). However, corrosion often occurs alongside thermal fatigue and coating durability under these conditions is highly desirable. The current study focuses on understanding the corrosion behavior and its influence on the thermal cyclic fatigue life of SPS TBCs. Corrosion tests were conducted at 780 OC using a mixed-gas (1SO2-0.1CO-20CO2-N2(bal.) in vol. %) for 168h. They were later thermally cycled between 100-1100 ⁰C with a 1h hold time at 1100 ⁰C. Corrosion test results indicated that the damage predominantly started from the edges and a milder damage was observed at the center. Nickel sulfide was observed on top of the top coat and also in the columnar gaps of the top coat. Chromium oxides were observed inside the top coat columnar gaps but close to the bond coat/top coat interface. They were believed to reduce the strain tolerance of SPS TBCs to an extent and also amplify the thermal mismatch stresses during TCF tests. This, together with a fast growth of alumina during the TCF, resulted in a significant drop in the TCF life compared to the standard TCF tests.

Place, publisher, year, edition, pages
New York, NY: American Society of Mechanical Engineers , 2019.
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-14701OAI: oai:DiVA.org:hv-14701DiVA, id: diva2:1370482
Conference
ASME Turbo Expo: Turbomachinery Technical Conference and Exposition, Phoenix, Arizona, USA, June 17-21, 2019
Available from: 2019-11-04 Created: 2019-11-15 Last updated: 2019-11-19

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Gupta, Mohit KumarPeng, Ru Lin

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