Thermal behaviour of multilayer and functionally-graded YSZ/Gd2Zr2O7 coatings

Carpio, Pablo; Salvador, M. D.; Borrell, Amparo; Sánchez, E.

doi:10.1016/j.ceramint.2016.11.178

Cited by 63 publications

(19 citation statements)

References 21 publications

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“…Gd 2 Zr 2 O 7 phase was maintained its stable position after APS process. Carpio et al [23] showed that YSZ-and GZ-based TBCs had the same porosity value when State of the Art of Gadolinium Zirconate Based Thermal Barrier Coatings: Design, Processing… DOI: http://dx.doi.org/10.5772/intechopen.85451 the same APS parameters were used. These results indicate that there is no microstructural problem in producing GZ by APS.…”

Section: Coating Process and Coating Architectures 21 Production Of mentioning

confidence: 99%

“…However, besides all of these advantages, GZ has two poor properties affecting its thermal cycling (TC) behavior in a negative manner. One of them is its low coefficient of thermal expansion (CTE, 10.4 × 10 −6 K −1 and 11 × 10 −6 K −1 for GZ and YSZ, respectively), and another one is its high tendency to react with the TGO layer [8,9,13,14,19,[21][22][23][24][25][26][27][28][29][30][31][32]. These problems were solved by using multilayered (MLed) and functionally graded (FGed) designs.…”

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confidence: 99%

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State of the Art of Gadolinium Zirconate Based Thermal Barrier Coatings: Design, Processing and Characterization

Gök¹,

Göller²

2020

Methods for Film Synthesis and Coating Procedures

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The fast consumption of fossil fuel resources and economic competitiveness makes it necessary to increase the efficiency of turbine engines. For this purpose, thermal barrier coating (TBC) has been used on some critical parts of gas turbines. Yttria-stabilized zirconia (YSZ) is widely and commercially used as a ceramic top coat material for TBC in the gas turbine system. On the other hand, the efforts to identify new material having better properties than YSZ have been continued. Gadolinium zirconate (GZ) is a promising alternative TBC material with its lower thermal conductivity, better sintering ability, and higher melting point and phase stability than YSZ. However, recent research studies on the responses of GZ-based TBC materials to the complex demands of modern gas turbine applications should be gathered under a study by comparing them with the results of traditional TBC material. This chapter discusses the GZ based TBC system, specifically addressing issues related to the production process and designing of the coating architecture, in comparison with some of the significant properties with YSZ and the test methodology. Moreover, the chapter also contains information about laser surface modification of the GZ-based TBC.

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Section: Coating Process and Coating Architectures 21 Production Of mentioning

confidence: 99%

mentioning

confidence: 99%

State of the Art of Gadolinium Zirconate Based Thermal Barrier Coatings: Design, Processing and Characterization

Gök¹,

Göller²

2020

Methods for Film Synthesis and Coating Procedures

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“…Two main methods are usually used for manufacturing TBCs top coat, namely: Atmospheric Plasma Spray (APS), and Electron Beam Physical Vapor Deposition (EB-PVD) [15].Other new methods include suspension plasma spray [16] solution precursor plasma spray [17], plasma spray-physical vapor deposition [18] and electrophoretic deposition [19]. Recently, advanced TBCs such as nanostructured TBCs [20] and functionally graded TBCs [21] with enhanced performance were produced. TBC performance can also be enhanced by laser glazing [ 22].…”

Section: Introductionmentioning

confidence: 99%

Thermal shock resistance of yttrium aluminium oxide Y3Al5O12 thermal barrier coating for titanium alloy

Almomani¹,

Al‐Widyan²,

Mohaidat³

2020

JMES

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The high strength-to- weight ratio of titanium alloys allows their use in jet engines. However, their use is restricted by susceptibility to oxidation at high temperatures. In this study, the possibility of increasing the operating temperature of titanium alloys through using Yttrium Aluminum Oxide (YAG) as a thermal barrier coating material for Ti-6Al-4V substrate is studied. The study concludes that YAG can be utilized to increase the operating temperature of Ti-6Al-4V titanium alloy from around 350 °C to 800 °C due to its low thermal conductivity and phase stability up to its melting point. In addition, its lower oxygen diffusivity in comparison with the standard YSZ material will provide a better protection of the titanium substrate from oxidation. In this work, coating was created using atmospheric plasma spray. X-ray Diffraction (XRD) and Scanning Electron Microscope (SEM) were used to examine coatings' composition and structure. The coating was characterized by thermal shock test, Vickers hardness test and adhesion strength test. X-ray diffraction indicated that the coating was of a partially crystalline Y3Al5O12 composition. The coating was porous with excellent thermal shock resistance at 800 oC, with a Vickers micro-hardness of 331.35 HV and adhesion strength of 17.6 MPa.

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“…Analytical modeling of the dynamic thermal response of materials with gradation of thermal properties in the direction perpendicular to the surface is of interest in various fields. This is an essential step in the design and optimization of the structure of functionally graded materials, such as those intended to withstand high thermal loads (e.g., thermal barriers) [1], [2], [3]. This may also be useful for interpreting the thermal response of functionally graded materials designed for other purposes, such as achieving a specific mechanical property (e.g., hardness).…”

Section: Introductionmentioning

confidence: 99%

Linear, trigonometric and hyperbolic profiles of thermal effusivity in the Liouville space and related quadrupoles: Simple analytical tools for modeling graded layers and multilayers

Krapez

2019

International Journal of Thermal Sciences

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This paper presents a series of new high-level analytical tools for the modeling of one-dimensional, transient or periodic, heat transfer in media presenting graded thermal properties (conductivity and/or specific heat), possibly in a layered configuration. They capitalize on a recent work on sequences of analytically solvable profiles and the related exact temperature solutions. These profiles describe the square root of thermal effusivity or its inverse; the independent variable is the square root of the integrated diffusion time along the considered path, as obtained after a Liouville transformation. The profiles addressed here are linear, hyperbolic or trigonometric functions of this variable. A systematic presentation is given on how to build these profiles in both partner forms, on the so-called Liouville inverse transformation to step back into the physical-depth space, and on the three quadrupole formulations. As compared to other graded profiles from the literature, the three transfer matrices are very easy to compute (only elementary functions are involved). The quadrupole approach is particularly suitable for modeling multilayers. We apply it to calculate the thermal response of a two-layer system with a graded coating of one or other of the three classes. The modulated and the transient regime have been considered. The ease of obtaining these results indicates that, upon proper arrangement, these three classes of solvable profiles may be used to compute the thermal response of continuously (or piece-wise continuously) heterogeneous media of arbitrary complexity (e.g., functionally graded materials). This also paves the way to new methods for photothermal inversion. Other research fields could benefit from these tools insofar as the evolution equation governing the observed phenomena involves variable coefficients (e.g., advection-diffusion equation, wave equation, etc.).

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Thermal behaviour of multilayer and functionally-graded YSZ/Gd2Zr2O7 coatings

Cited by 63 publications

References 21 publications

State of the Art of Gadolinium Zirconate Based Thermal Barrier Coatings: Design, Processing and Characterization

State of the Art of Gadolinium Zirconate Based Thermal Barrier Coatings: Design, Processing and Characterization

Thermal shock resistance of yttrium aluminium oxide Y3Al5O12 thermal barrier coating for titanium alloy

Linear, trigonometric and hyperbolic profiles of thermal effusivity in the Liouville space and related quadrupoles: Simple analytical tools for modeling graded layers and multilayers

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