Recent Activities in the Field of Thermal Barrier Coatings Including Burner Rig Testing in the European Union

Vaßen, Robert; Cernuschi, F.; Rizzi, G.; Scrivani, A.; Markocsan, Nicolaie; Östergren, Lars; Kloosterman, Arjen; Mévrel, R.; Feist, J. P.; Nicholls, John

doi:10.1002/adem.200800015

Cited by 53 publications

(26 citation statements)

References 55 publications

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“…Before testing, overspray was ground away from the edge of the sample and the button mounted to a carrier plate using a single spot weld. Thermal shock testing was conducted using a burner rig at GKN Aerospace (Trollhä ttan, Sweden) [26]. Samples were subjected to 75-s cycles with heating to surface temperatures of 1200 °C, bond coat temperatures of approximately 1000 °C and rear face temperatures of between 960 and 980 °C.…”

Section: Thermal Shock Testingmentioning

confidence: 99%

Thermal Conductivity Analysis and Lifetime Testing of Suspension Plasma-Sprayed Thermal Barrier Coatings

Curry

VanEvery²,

Snyder³

et al. 2014

Coatings

117

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Suspension plasma spraying (SPS) has become an interesting method for the production of thermal barrier coatings for gas turbine components. The development of the SPS process has led to structures with segmented vertical cracks or column-like structures that can imitate strain-tolerant air plasma spraying (APS) or electron beam physical vapor deposition (EB-PVD) coatings. Additionally, SPS coatings can have lower thermal conductivity than EB-PVD coatings, while also being easier to produce. The combination of similar or improved properties with a potential for lower production costs makes SPS of great interest to the gas turbine industry. This study compares a number of SPS thermal barrier coatings (TBCs) with vertical cracks or column-like structures with the reference of segmented APS coatings. The primary focus has been on lifetime testing of these new coating systems. Samples were tested in thermo-cyclic fatigue at temperatures of 1100 °C for 1 h cycles. Additional testing was performed to assess thermal shock performance and erosion resistance. Thermal conductivity was also assessed for samples in their as-sprayed state, and the microstructures were investigated using SEM.

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Section: Thermal Shock Testingmentioning

confidence: 99%

Thermal Conductivity Analysis and Lifetime Testing of Suspension Plasma-Sprayed Thermal Barrier Coatings

Curry

VanEvery²,

Snyder³

et al. 2014

Coatings

117

View full text Add to dashboard Cite

show abstract

“…The rig is further described in Ref. [42] and a temperature curve for a similar cycle is available in Ref. [43].…”

Section: Heat Treatmentmentioning

confidence: 99%

Influence of isothermal and cyclic heat treatments on the adhesion of plasma sprayed thermal barrier coatings

Eriksson¹,

Brodin²,

Johansson³

et al. 2011

Surface and Coatings Technology

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The adhesion of thermal barrier coatings (TBC) has been studied using the standard method described in ASTM C633, which makes use of a tensile test machine to measure the adhesion. The studied specimens consist of air plasma sprayed (APS) TBC deposited on disc-shaped substrate coupons of Ni-base alloy Hastelloy X. The bond coat (BC) is of a NiCoCrAlY type and the top coat (TC) consists of yttria-stabilised-zirconia. Before the adhesion test, the specimens were subjected to three different heat treatments: 1) isothermal oxidation at 1100 up to 290 h, 2) thermal cycling fatigue (TCF) at 1100 up to 300 cycles and 3) thermal shock at ∼ 1140 BC/TC interface temperature up to 1150 cycles. The adhesion of the specimens is reported and accompanied by a microstructural study of the BC and the thermally grown oxides (TGO), as well as a discussion on the influence of BC/TC interfacial damage on adhesion properties of TBC. The adhesion was * Corresponding author. Tel.: +46 13 284410; fax: +46 13 282505. E-mail address: robert.eriksson@liu.se Preprint submitted to Surface and Coatings Technology June 4, 2011 found to vary with heat treatment, as well as with heat treatment length.

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“…Although these stresses are an order of magnitude lower than the residual stresses in TGO [4] they may still contribute to the coating damage. To study the failure due to the CTE mismatch between the top coat and the substrate, thermal shock tests, also known as burner rig tests [42] are conducted. Here, the heating and cooling rates are usually much higher and the dwell time at high temperature is very short compared to the thermal cycling tests.…”

Section: Fig 8 Schematic Illustration Of a Thermal Cycling Test Rigmentioning

confidence: 99%

Failure mechanisms in APS and SPS thermal barrier coatings during cyclic oxidation and hot corrosion

Jonnalagadda¹

2017

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Linköping 2017Front page image: The top view of yttria stabilized zirconia thermal barrier coating after exposure to a salt mixture of vanadium pentoxide and sodium sulfate at 900 o C.During the course of research underlying this thesis, Krishna Praveen Jonnalagadda was enrolled in Agora Materiae, a multidisciplinary doctoral program at Linköping University, Sweden.ISBN: 978-91-7685-594-2 ISSN: 0280-7971Printed by LiU-Tryck 2017 iii AbstractThermal Barrier Coatings (TBCs) are advanced material systems that are being used in the hot sections of gas turbines such as combustor, turbine blades, and vanes. The top ceramic coating in TBCs provides insulation against the hot gases and the intermediate metallic bond coat provides oxidation and corrosion resistance to the underlying turbine components.Durability of thermal barrier coatings is very important for the overall performance of the gas turbine. TBCs can fail in several different ways and there is a combination of more than one failure mechanism in most situations. One of the most widely used TBC is atmospheric plasma sprayed (APS) yttria stabilized zirconia (YSZ). Both the deposition technique and the TBC material have certain limitations. The main aim of this research is to study new TBC materials and/or new deposition techniques and compare with the conventional YSZ and understand their failure mechanisms during cyclic oxidation and hot corrosion.Thermal cyclic oxidation of a newly developed high purity nano YSZ thermal barrier coating has been studied. Cross sectional analysis of exposed as well as completely failed samples showed a mixed-type failure caused by crack propagation parallel to the bond coat/top coat interface. The majority of the damage occurred towards the end of the coating life. A finite element model has been developed to study the probability of crack growth along different paths that leads to the final failure.Hot corrosion mechanism in suspension plasma sprayed two-layer gadolinium zirconate/YSZ, three-layer dense gadolinium zirconate/gadolinium zirconate/YSZ, and a single-layer YSZ has been studied in the presence of sodium sulfate and vanadium pentoxide. The test results showed that gadolinium zirconate coatings were more susceptible to corrosion compared to YSZ coatings despite gadolinium zirconate coatings having lower reactivity with the corrosive salts.Thermal cycling behavior of a high chromium bond coat has been studied. Cross-sectional analysis showed formation of sandwich type microstructure with chromium rich oxide and alumina as the top and the bottom layers.Inter-diffusion of minor elements between different MCrAlY coatings -substrate systems has been studied using, diffusion simulation software, DICTRA. The simulation results showed that the diffusion of minor elements in the coatings is dependent on the rate of β phase depletion in the beginning. After the depletion of β phase there was no clear dependence of the coating composition on the diffusion of minor elements.v SammanfattningTermiska barriärskikt, eller TBC från...

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Recent Activities in the Field of Thermal Barrier Coatings Including Burner Rig Testing in the European Union

Cited by 53 publications

References 55 publications

Thermal Conductivity Analysis and Lifetime Testing of Suspension Plasma-Sprayed Thermal Barrier Coatings

Thermal Conductivity Analysis and Lifetime Testing of Suspension Plasma-Sprayed Thermal Barrier Coatings

Influence of isothermal and cyclic heat treatments on the adhesion of plasma sprayed thermal barrier coatings

Failure mechanisms in APS and SPS thermal barrier coatings during cyclic oxidation and hot corrosion

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