Multilayered Thermal Barrier Coating for Land-Based Gas Turbines

Tamura, Masataka; Takahashi, M.; Ishii, Junya; Suzuki, Kenichi; Sato, Mikio; Shimomura, Kosuke

doi:10.1361/105996399770350584

Cited by 67 publications

(31 citation statements)

References 4 publications

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“…Plasma-sprayed ceramic coatings are widely used for thermal and environmental protection, particularly in gas turbines (Ref [1][2][3][4]. Thermal barrier coatings (TBCs) are particularly critical in these applications.…”

Section: Introductionmentioning

confidence: 99%

Effects of Impurity Content on the Sintering Characteristics of Plasma-Sprayed Zirconia

et al. 2007

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Yttria-stabilized zirconia powders, containing different levels of SiO 2 and Al 2 O 3 , have been plasma sprayed onto metallic substrates. The coatings were detached from their substrates and a dilatometer was used to monitor the dimensional changes they exhibited during prolonged heat treatments. It was found that specimens containing higher levels of silica and alumina exhibited higher rates of linear contraction, in both in-plane and through-thickness directions. The in-plane stiffness and the through-thickness thermal conductivity were also measured after different heat treatments and these were found to increase at a greater rate for specimens with higher impurity (silica and alumina) levels. Changes in the pore architecture during heat treatments were studied using Mercury Intrusion Porosimetry (MIP). Fine scale porosity (<$50 nm) was found to be sharply reduced even by relatively short heat treatments. This is correlated with improvements in inter-splat bonding and partial healing of intra-splat microcracks, which are responsible for the observed changes in stiffness and conductivity, as well as the dimensional changes.

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Section: Introductionmentioning

confidence: 99%

Effects of Impurity Content on the Sintering Characteristics of Plasma-Sprayed Zirconia

et al. 2007

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“…Failure of a TBC system is often associated with oxidation of the metallic bond coat at elevated temperatures via formation of a thermally grown oxide (TGO) layer by depletion of aluminum from the bond coat [2][3][4][5][6][7][8]. In past work, it was observed that plasmasprayed TBCs failed by spallation of the ceramic coat near the original ceramic/bond coat interface but mostly within the ceramic layer [9][10][11][12], whereas EB-PVD-produced TBCs failed at the interface between the TGO and the bond coat [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…In past work, it was observed that plasmasprayed TBCs failed by spallation of the ceramic coat near the original ceramic/bond coat interface but mostly within the ceramic layer [9][10][11][12], whereas EB-PVD-produced TBCs failed at the interface between the TGO and the bond coat [13,14]. The TBC failure could be attributed, in part, to the biaxial compressive stress state built up at the interface between the ceramic top coat and the bond coat during cooling from elevated temperatures to the ambient temperature due to thermal expansion mismatch between the two constituents [2,5]. These stresses could increase progressively, cycle by cycle, as a result of the reduced deformability of the bond coat [2].…”

Section: Introductionmentioning

confidence: 99%

Oxidation and crack nucleation/growth in an air-plasma-sprayed thermal barrier coating with NiCrAlY bond coat

Chen

Marple

et al. 2005

Surface and Coatings Technology

166

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The oxidation behavior of an air-plasma-sprayed thermal barrier coating (APS-TBC) system was investigated in both air and low-pressure oxygen environments. It was found that mixed oxides, in the form of (Cr,Al) 2 O 3 d Ni(Cr,Al) 2 O 4 d NiO, formed heterogeneously at a very early stage during oxidation in air, and in the meantime, a layer of predominantly Al 2 O 3 grew rather uniformly along the rest of the ceramic/bond coat interface. The mixed oxides were practically absent in the TBC system when exposed in the low-pressure oxygen environment, where the TBC had a longer life. Through comparison of the microstructures of the APS-TBC exposed in air and low-pressure oxygen environment, it was concluded that the mixed oxides played a detrimental role in causing crack nucleation and growth, reducing the life of the TBC in air. The crack nucleation and growth mechanism in the air-plasma-sprayed TBC is further elucidated with emphasis on the Ni(Cr,Al) 2 O 4 and NiO particles embedded in the chromia. D

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“…The multilayer geometry is also effective for the improvement of the thermal shock life of thermal barrier coatings (TBCs), because no Study of Al2O3/ZrO2 (5 nm/20 nm) Nanolaminate Composite single material satisfies the requirements of TBCs [10]. Besides this application, Al2O3/ZrO2 multilayers are widely used in several technological applications such as antireflection coating on micro optics, dielectric material in metal oxide semiconductor (MOS) devices and high transparent materials in optical applications [10][11][12]. In the present work, an attempt has been made to prepare a Al2O3/ZrO2 film and hence to stabilize the tetragonal phase at a temperature as low as possible using pulsed laser deposition (PLD).…”

Section: Introductionmentioning

confidence: 99%

Study of Al₂O₃/ZrO₂ (5 nm/20nm) Nanolaminate Composite

Balakrishnan¹,

Wasy²,

호하선³

et al. 2013

Composites Research

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A nanolaminate consisting of alternate layers of aluminium oxide (Al2O3) (5 nm) and zirconium oxide (ZrO2) (20 nm) was deposited at an optimized oxygen partial pressure of 3×10 -2 mbar by pulsed laser deposition. The nanolaminate film was analysed using high temperature X-ray diffraction (HTXRD) to study phase transition and thermal expansion behaviour. The surface morphology was investigated using field emission scanning electron microscopy (FE-SEM). High temperature X-ray diffraction indicated the crystallization temperature of tetragonal zirconia in the Al2O3/ZrO2 multilayer -film was 873 K. The mean linear thermal expansion coefficient of tetragonal ZrO2 was 4.7×10 -6 K -1 along a axis, while it was 13.68×10 -6 K -1 along c axis in the temperature range 873-1373 K. The alumina was in amorphous nature. The FESEM studies showed the formation of uniform crystallites of zirconia with dense surface.

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Multilayered Thermal Barrier Coating for Land-Based Gas Turbines

Cited by 67 publications

References 4 publications

Effects of Impurity Content on the Sintering Characteristics of Plasma-Sprayed Zirconia

Effects of Impurity Content on the Sintering Characteristics of Plasma-Sprayed Zirconia

Oxidation and crack nucleation/growth in an air-plasma-sprayed thermal barrier coating with NiCrAlY bond coat

Study of Al₂O₃/ZrO₂ (5 nm/20nm) Nanolaminate Composite

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Multilayered Thermal Barrier Coating for Land-Based Gas Turbines

Cited by 67 publications

References 4 publications

Effects of Impurity Content on the Sintering Characteristics of Plasma-Sprayed Zirconia

Effects of Impurity Content on the Sintering Characteristics of Plasma-Sprayed Zirconia

Oxidation and crack nucleation/growth in an air-plasma-sprayed thermal barrier coating with NiCrAlY bond coat

Study of Al2O3/ZrO2 (5 nm/20nm) Nanolaminate Composite

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Study of Al₂O₃/ZrO₂ (5 nm/20nm) Nanolaminate Composite