Thermal cyclic response of yttria-stabilized zirconia/CoNiCrAlY thermal barrier coatings

Wu, Bingxin; Chang, Edward F.; Chang, Shih-Feng; Chao, C. H.

doi:10.1016/0040-6090(89)90648-2

Cited by 45 publications

(14 citation statements)

References 5 publications

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“…Isothermal cyclic test, wherein the temperatures of the top coat and substrate stay the same, is one of the popular approaches to evaluate the lifetime of TBCs. However, the oxidation rate of BC increases dramatically when the test temperature exceeds a certain degree (i.e., 1075°C) . Moreover, the isothermal cyclic test cannot embody the fundamental thermal barrier role of TBCs since the effects of all factors on the lifetime are integrated, thus being difficult to separate .…”

Section: Introductionmentioning

confidence: 99%

“…However, the oxidation rate of BC increases dramatically when the test temperature exceeds a certain degree (i.e., 1075°C). 21,22 Moreover, the isothermal cyclic test cannot embody the fundamental thermal barrier role of TBCs since the effects of all factors on the lifetime are integrated, thus being difficult to separate. 23 To better simulate the real service condition of TBCs, gradient thermal cyclic tests attract more and more attentions.…”

Section: Introductionmentioning

confidence: 99%

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Sintering‐induced delamination of thermal barrier coatings by gradient thermal cyclic test

et al. 2017

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Lifetime is crucial to the application of advanced thermal barrier coatings (TBCs), and proper lifetime evaluation methods should be developed to predict the service lifetime of TBCs precisely and efficiently. In this study, plasma‐sprayed YSZ TBCs were subjected to gradient thermal cyclic tests under different surface temperatures, with the aim of elucidating the correlation between the coating surface temperature and the thermal cyclic lifetime. Results showed that the thermal cyclic lifetime of TBCs decreased with the increasing of surface temperatures. However, the failure modes of these TBCs subjected to thermal cyclic tests were irrespective of different surface/BC temperatures, that is, sintering‐induced delamination of the top coat. The thickness of thermally grown oxide (TGO) was significantly less than the critical TGO thickness to result in the failure of TBCs through the delamination of top coat. There was no phase transformation of the top coat after failure. In contrast, in the case concerning the top coat surface of the failure specimens, the elastic modulus and microhardness increased to a comparable level due to sintering despite of the various thermal cyclic conditions. Consequently, it is conclusive that the failure of TBCs subjected to gradient thermal cyclic test was primarily induced by sintering during high‐temperature exposure. A delamination model with multilayer splats was developed to assist in understanding the failure mechanism of TBCs through sintering‐induced delamination of the top coat. Based on the above‐described results, this study should aid in facilitating the lifetime evaluation of the TBCs, which are on active service at relatively lower temperatures, by an accelerated thermal cyclic test at higher temperatures in laboratory conditions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sintering‐induced delamination of thermal barrier coatings by gradient thermal cyclic test

et al. 2017

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“…Since the conception of TBC systems much work has been undertaken to UNCLASSIFIED/UNLIMITED UNCLASSIFIED/UNLIMITED understand how the alumina oxide grows, interacts, degrades and finally fails during high temperature service, specifically as measured by the thermal cyclic life [26][27][28][29][30][31]. The multi-material aspects of the TBC system complicate this understanding through, diffusion, stress relaxation and chemical interactions between the component parts.…”

Section: Unclassified/unlimited Unclassified/unlimitedmentioning

confidence: 99%

Erosion and Foreign Object Damage of Thermal Barrier Coatings

Nicholls

Jaslier²,

Rickerby³

1997

MSF

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“…It has been shown that failure of plasma-sprayed TBCs occurs within the top coat just above the TGO. [9,14,15] Schlichting et al [8] propose that cracks initiate, as shown in Figure 10, where cracking exists in the TBC and also along the TGO/bond coat interfaces. The primary failure modes in these TBCs appear to be cracking of the bond coat/ TGO interface, cracking within the top coat, and linking of these by fracture of the TGO.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Failures during Cyclic Oxidation of Yttria-Stabilized (7 to 8 Weight Percent) Zirconia Thermal Barrier Coatings Fabricated via Electron Beam Physical Vapor Deposition and Air Plasma Spray

Yanar

Helminiak

Meier

et al. 2010

Metall Mater Trans A

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The failures during oxidation of electron beam physical vapor deposition (EBPVD) and air plasma spray (APS) yttria-stabilized zirconia (YSZ) thermal barrier coatings (TBCs) on different bond coats, namely, platinum-modified aluminide and NiCoCrAlY, are described. It is shown that oxidation of the bond coats, along with defects existing near the TBC/bond coat interface, plays a very important role in TBC failures. Procedures to improve TBC performance via modifying the oxidation characteristics of the bond coats and removing the as-processed defects are discussed. The influence of exposure conditions on TBC lives is described and factors such as cycle frequency and thermal gradients are discussed.

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Thermal cyclic response of yttria-stabilized zirconia/CoNiCrAlY thermal barrier coatings

Cited by 45 publications

References 5 publications

Sintering‐induced delamination of thermal barrier coatings by gradient thermal cyclic test

Sintering‐induced delamination of thermal barrier coatings by gradient thermal cyclic test

Erosion and Foreign Object Damage of Thermal Barrier Coatings

Comparison of the Failures during Cyclic Oxidation of Yttria-Stabilized (7 to 8 Weight Percent) Zirconia Thermal Barrier Coatings Fabricated via Electron Beam Physical Vapor Deposition and Air Plasma Spray

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