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Failure analysis of thermally cycled columnar thermal barrier coatings produced by high-velocity-air fuel and axial-suspension-plasma spraying: A design perspective

SYSNO ASEP	0489520
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Failure analysis of thermally cycled columnar thermal barrier coatings produced by high-velocity-air fuel and axial-suspension-plasma spraying: A design perspective
Author(s)	Ganvir, A. (SE) Vaidhyanathan, V. (SE) Markocsan, N. (SE) Gupta, M. (SE) Pala, Zdeněk (UFP-V)_RID Lukáč, František (UFP-V)_ORCID
Source Title	Ceramics International. - : Elsevier - ISSN 0272-8842 Roč. 44, č. 3 (2018), s. 3161-3172
Number of pages	12 s.
Publication form	Print - P
Language	eng - English
Country	GB - United Kingdom
Keywords	Columnar Thermal Barrier Coatings ; Axial Suspension Plasma spraying ; Thermal Cyclic Fatigue ; High Velocity Air Fuel Spraying
Subject RIV	JK - Corrosion ; Surface Treatment of Materials
OECD category	Coating and films
Institutional support	UFP-V - RVO:61389021
UT WOS	000423891900070
EID SCOPUS	85034822127
DOI	10.1016/j.ceramint.2017.11.084
Annotation	Axial-suspension-plasma spraying (ASPS) is a fairly recent thermal spray technology which enables production of ceramic top coats in TBCs, incorporating simultaneously the properties of both the conventional-plasma sprayed (highly insulating porous structures) and electron-beam-physical-vapor-deposited (strain-tolerant columnar structures) top coats. TBCs are required to insulate the hot components in a gas turbine engine against high temperature and harsh operating conditions. Periodic heating and cooling of turbine engines during operation can create severe thermal cyclic fatigue conditions which can degrade the performance of these coatings eventually leading to the failure. An in-depth experimental investigation was performed to understand the failure behavior of columnar TBCs subjected to thermal cyclic fatigue (TCF) test at 1100 degrees C. The study revealed that the TCF performance was influenced to an extent, by the top coat microstructure, but was primarily affected by the severity of thermally grown oxide (TGO) growth at the bond coat-top coat interface. Mixed failure modes comprising crack propagation through the bond coat-TGO interface, through TGO and within the top coat were identified. Based on the analysis of the experimental results and thorough discussion a novel design of microstructure for the high TCF performance columnar TBC is proposed.
Workplace	Institute of Plasma Physics
Contact	Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975
Year of Publishing	2019

Number of the records: 1