Some recent trends in research and technology of advanced thermal barrier coatings

Schulz, Uwe; Leyens, Christoph; Fritscher, K.; Peters, M.; Saruhan-Brings, Bilge; Lavigne, O.; Dorvaux, Jean‐Marc; Poulain, Martine; Mévrel, R.; Caliez, Michaël

doi:10.1016/s1270-9638(02)00003-2

Cited by 433 publications

(157 citation statements)

References 31 publications

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“…Traditionally, TBC ceramics have been applied either by air plasma spraying (APS) or electron beam physical vapor deposition (EB-PVD) [4]. APS has the advantage of lower overall cost, higher process flexibility, lower as-sprayed thermal conductivity and long lifetimes [5,6].…”

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

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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: 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

“…Thus thermal barrier coating (TBC) systems, which are used to protect turbine blades from these harsh operating environments, continue to be intensively studied so that their durability can be improved [1][2][3]. Generally a TBC system is deposited on a superalloy substrate and consists of an aluminium containing bond coat (BC) between the superalloy and the ceramic top coat, which acts as the actual thermal barrier.…”

Section: Introductionmentioning

confidence: 99%

Application of small punch creep testing to a thermally sprayed CoNiCrAlY bond coat

Chen

Hyde

Voisey

et al. 2013

Materials Science and Engineering: A

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High velocity oxy-fuel thermal spraying was used to prepare free-standing CoNiCrAlY ) bond coat alloy samples approximately 0.5 mm thick. Creep tests were conducted at 750 C on these samples using a small punch (SP) creep test method. The samples were characterised before and after creep testing using scanning electron microscopy with electron backscatter diffraction (EBSD). EBSD revealed a two phase fcc -Ni and bcc B2 β-NiAl microstructure with grain sizes ~ 1-2 m for both phases, which did not change significantly following testing. The constant temperature SP test data were characterised by a minimum creep strain rate, , and a total time to failure, t f , at different applied stresses. The data are fitted to conventional power law equations with a stress exponent for creep close to 8 in the Norton power law and between 7 and 10 in the Monkman-Grant creep rupture law. Creep rupture was predominantly due to creep cavitation voids nucleating at both the γ -β interphase boundaries and the  - grain boundaries leading to final failure by void linkage. However, rupture life was influenced by the quantity of oxide entrained in the coating during the spray deposition process.

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“…Currently, TBCs are deposited by air plasma-spraying (APS) 15 or by electron beam physical vapor deposition (EBPVD). 16 Typically, the low-cost APS method is used to deposit TBCs on stationary engine parts (combustor, shroud, vanes), whereas EBPVD TBCs are used on the most demanding hot-section parts in jet engines such as blades and vanes. Today, both stationary and rotating hot-section parts in electricity-generation engines, which tend to be much larger than those in jet engines, use APS TBCs.…”

Section: Ceramic Topcoat Processingmentioning

confidence: 99%

Thermal-barrier coatings for more efficient gas-turbine engines

2012

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Gas-turbine engines used in transportation, energy, and defense sectors rely on high-temperature thermal-barrier coatings (TBCs) for improved effi ciencies and power. The promise of still higher effi ciencies and other benefi ts is driving TBCs research and development worldwide. An introduction to TBCs-complex, multi-layer evolving systems-is presented, where these fascinating systems touch on several known phenomena in materials science and engineering. Critical elements identifi ed as being important to the development of future TBCs form the basis for the fi ve articles in this issue of MRS Bulletin . These articles are introduced, together with a discussion of the major challenges to improved coating development and the rich opportunities for materials research they provide.

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Some recent trends in research and technology of advanced thermal barrier coatings

Cited by 433 publications

References 31 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

Application of small punch creep testing to a thermally sprayed CoNiCrAlY bond coat

Thermal-barrier coatings for more efficient gas-turbine engines

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