Texture of EB-PVD Thermal Barrier Coatings Under Variable Deposition Conditions / Textur von EB-PVD Wärmedämmschichten bei unterschiedlichen Aufdampfbedingungen

Schulz, Uwe; Oettel, H.; Bunk, W.

doi:10.1515/ijmr-1996-870611

Cited by 5 publications

(2 citation statements)

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“…[6] There are plenty of intercolumnar pore structures in TBC layers prepared by EB-PVD, [7] and this intercolumnar pore structure is perpendicular to the coating plane. [8,9] This intercolumnar pore can influence the TBC interface. It is found that the elongated intercolumnar pore created by the EB-PVD enhances the flexibility of the coating on the substrate plane and improves the lifetime of the TBC.…”

Section: Introductionmentioning

confidence: 99%

Solid–gas interface thermal conductance for the thermal barrier coating with surface roughness: The confinement effect

Zhao

Jiang²

2022

Chinese Phys. B

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The yttria-stabilized zirconia (YSZ) is a famous thermal barrier coating material to protect hot-end components of the engine. As a characteristic feature of the YSZ, the surface roughness shall play an important role in the interface thermal conductance between the YSZ and gas, considering that the gas is typically at an extremely high temperature. We investigate the effect of the surface roughness on the thermal conductance of the YSZ-gas interface with surface roughness described by nanoscale pores on the surface of the YSZ. We reveal two competitive mechanisms related to the microstructure of the pore, i.e., the actual contact area effect and the confinement effect. The increase of the pore depth will enlarge the actual contact area between the YSZ and gas, leading to the enhancement of the solid-gas interface thermal conductance. In contrast to the positive actual contact area effect, the geometry-induced confinement effect greatly reduces the interface thermal conductance. These findings shall offer some fundamental understandings for the microscopic mechanisms of the YSZ-gas interface thermal conductance.

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Section: Introductionmentioning

confidence: 99%

Solid–gas interface thermal conductance for the thermal barrier coating with surface roughness: The confinement effect

Zhao

Jiang²

2022

Chinese Phys. B

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“…Thermal barrier coatings (TBCs) with high performance have been essential for next generation advanced gas turbines operating at extremely high temperatures [1][2][3][4][5][6][7][8][9][10][11][12]. The key role of TBCs is, of course, to protect the metal substrate from high temperature oxidation and environmental attack [1,2].…”

Section: Introductionmentioning

confidence: 99%

Some Problems on Evaluating Elastic Modulus of APSed Ceramic Top Coat for TBCs by Indentation Method

Okazaki

Ozaki

2007

KEM

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Elastic modulus of air plasma sprayed (APSed) YSZ (; ZrO2 stabilized by 8 wt. pct. Y2O3) top coat specimen, which is frequently used for thermal barrier coating (TBC) system for advanced gas turbines, was measured by employing the macro-, micro-, and nano-indentation methods. The elastic modulus was measured, following the Oliver-Pharr method. It was shown that the elastic modulus of the YSZ, as well as the microstructure, was significantly influenced by the spraying conditions employed. Especially the size of ceramic powders used was found to have the most pronounced effect. It was also shown that the elastic modulus revealed significant size effect: that is, there were significant differences in elastic modulus measured by the instruments on the macro-, micro-, and nano-levels. This size effect was discussed, correlating with some relating phenomena: crackings, sink-in, pile-up and spalling; as well as with the characteristic microstructures of the sprayed top coat.

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Influence of Processing on Microstructure and Performance of Electron Beam Physical Vapor Deposition (EB-PVD) Thermal Barrier Coatings

Schulz

Fritscher

Leyens

et al. 2002

Journal of Engineering for Gas Turbines and Power

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The paper addresses the effect of processing parameters on microstructure and lifetime of electron beam physical vapor deposition, partially yttria-stabilized zirconia (EB-PVD PYSZ) coatings deposited onto NiCoCrAlY-coated Ni-base superalloys. In particular, the formation of a thermally grown oxide layer, an equi-axed zone, and various columnar arrangements of the highly textured PYSZ layers are discussed with respect to processing conditions. Three different microstructures were cyclically tested at 1100°C. The intermediate columnar structure was superior with respect to cyclic life times to a fine and to a coarse columnar structure which was mainly attributed to differences in the elastic properties. The effect of PYSZ microstructure on hot corrosion behavior of the thermal barrier coating (TBC) system at 950°C is briefly discussed.

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Texture of EB-PVD Thermal Barrier Coatings Under Variable Deposition Conditions / Textur von EB-PVD Wärmedämmschichten bei unterschiedlichen Aufdampfbedingungen

Cited by 5 publications

References 0 publications

Solid–gas interface thermal conductance for the thermal barrier coating with surface roughness: The confinement effect

Solid–gas interface thermal conductance for the thermal barrier coating with surface roughness: The confinement effect

Some Problems on Evaluating Elastic Modulus of APSed Ceramic Top Coat for TBCs by Indentation Method

Influence of Processing on Microstructure and Performance of Electron Beam Physical Vapor Deposition (EB-PVD) Thermal Barrier Coatings

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