Studies of the sintering kinetics of thick thermal barrier coatings by thermal diffusivity measurements

Cernuschi, F.; Lorenzoni, L.; Ahmaniemi, S.; Vuoristo, Petri; Mäntylä, T.

doi:10.1016/j.jeurceramsoc.2004.01.009

Cited by 89 publications

(51 citation statements)

References 20 publications

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“…It can be noted that, as with an APS coating, there is some increase in thermal conductivity after high temperature exposure, due to sintering of the microstructure after several hours at high temperature [9]. The degree of microstructural change is expected to be consistent with Stage 1 sintering, as defined by Cernuschi et al [7], which occurs during the first hours of exposure at high temperatures. During this time, crack healing and bridging of the microstructure occurs, resulting in improved thermal conduction through the coating.…”

Section: Thermal Conductivitymentioning

confidence: 78%

“…APS has the advantage of lower overall cost, higher process flexibility, lower as-sprayed thermal conductivity and long lifetimes [5,6]. However, APS coatings are highly susceptible to sintering, which degrades the mechanical and thermal properties of the coatings [7][8][9]. On the other hand, the EB-PVD process can produce columnar structures that can tolerate larger amounts of expansion and contraction [10], but these coatings tend to be more thermally conductive than APS coatings.…”

Section: Introductionmentioning

confidence: 99%

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

Curry

VanEvery²,

Snyder³

et al. 2014

Coatings

115

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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 Conductivitymentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

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

Curry

VanEvery²,

Snyder³

et al. 2014

Coatings

115

View full text Add to dashboard Cite

show abstract

“…Some irreversible microstructure change took place during high temperature exposure. 8,14) In particular, reduction of the crack-like micro-porosity has been observed due to the densification processes, typically caused by sintering. These could be considered as the main mechanisms responsible for the increase of thermal conductivity.…”

Section: Effects Of Heat Treatment On Microstructures and Physical Prmentioning

confidence: 99%

“…microcracks and pores are closed or at least reduced in surface area. The sintering effect is disadvantageous to TBCs because it will increase thermal conductivity 8) and Young's modulus of the coatings 9) and will reduce thermal shock resistance. 10) In order to fully make use of the potential advantages of the segmented TBCs, it is necessary to understand the effects of sintering on the microstructures and resultant properties of the coatings.…”

Section: Introductionmentioning

confidence: 99%

Effects of Heat Treatment on Microstructures and Physical Properties of Segmented Thermal Barrier Coatings

2005

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Highly segmented thermal barrier coatings (TBCs) were produced by ''hot'' plasma spraying. The effects of heat treatment on the microstructures, mechanical and thermophysical properties were studied. The segmented coatings are denser than traditionally plasma-sprayed TBCs due to its good insplat bonding at high substrate temperature. The segmentation cracks and associating branching cracks hardly propagated or closed during sintering process, indicative of a good stability of crack network. Due to its low porosity, the segmented coatings compromised the property of thermal insulation of TBCs. For the coatings after 24 h heat treatment at 1523 K, the thermal conductivity was improved by around 35%. The segmentation cracks had a strong impact on decreasing the Young's modulus. Heat treatment could not effectively promote the increase of the Young's modulus, especially for the case of highly segmented coatings.

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“…As the industrial requirements for TBC surface and/or bond coat temperatures increase, the industry-wide concerns are related to YSZ TBC property degradation (APS as well as EB-PVD coatings) which drives the research for new ceramic coatings with lower thermal conductivity, increased phase stability, and sintering resistance (Ref [33][34][35] system is shown in Fig. 6 (Ref 39,40).…”

Section: Thermal Protection Coatings For Superalloy Componentsmentioning

confidence: 99%

Advances in Thermal Spray Coatings for Gas Turbines and Energy Generation: A Review

Hardwicke¹,

Lau²

2013

J Therm Spray Tech

236

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Functional coatings are widely used in energy generation equipment in industries such as renewables, oil and gas, propulsion engines, and gas turbines. Intelligent thermal spray processing is vital in many of these areas for efficient manufacturing. Advanced thermal spray coating applications include thermal management, wear, oxidation, corrosion resistance, sealing systems, vibration and sound absorbance, and component repair. This paper reviews the current status of materials, equipment, processing, and propertiesÕ aspects for key coatings in the energy industry, especially the developments in large-scale gas turbines. In addition to the most recent industrial advances in thermal spray technologies, future technical needs are also highlighted.

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Studies of the sintering kinetics of thick thermal barrier coatings by thermal diffusivity measurements

Cited by 89 publications

References 20 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

Effects of Heat Treatment on Microstructures and Physical Properties of Segmented Thermal Barrier Coatings

Advances in Thermal Spray Coatings for Gas Turbines and Energy Generation: A Review

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