Sintering and failure behaviour of EB-PVD thermal barrier coating after isothermal treatment

Zhao, Xiaofeng; Wang, X.; Xiao, Ping

doi:10.1016/j.surfcoat.2005.09.006

Cited by 79 publications

(43 citation statements)

References 25 publications

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“…That means that the TBC is damaged when the elastic energy stored in the TBCs is released during the delamination. This assumption is supported by the measurements of Zhao et al [31], who found an increase of the residual stress with higher heat treatment temperatures and durations. However, this failure mechanism could not be confirmed by SEM investigations, because the damage is assumed to be breaking of the sinter bridges which form during heat treatment.…”

Section: Resultssupporting

confidence: 66%

Miniaturized bend tests on partially stabilized EB-PVD ZrO2 thermal barrier coatings

Pfeiffer

Affeldt

Göken

2011

Surface and Coatings Technology

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Section: Resultssupporting

confidence: 66%

Miniaturized bend tests on partially stabilized EB-PVD ZrO2 thermal barrier coatings

Pfeiffer

Affeldt

Göken

2011

Surface and Coatings Technology

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“…In view of its importance, the influence of high temperature exposure in terms of sintering of the ceramic-layer, pore closure etc. has been well-studied in case of both APS [28][29][30] and EB-PVD [31][32][33] TBCs. However such studies on SPS TBCs have been rare as per the author's knowledge and, therefore, an attempt has been made to specifically address this issue in the present work.…”

Section: Introductionmentioning

confidence: 99%

Influence of Isothermal Heat Treatment on Porosity and Crystallite Size in Axial Suspension Plasma Sprayed Thermal Barrier Coatings for Gas Turbine Applications

2016

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Axial suspension plasma spraying (ASPS) is an advanced thermal spraying technique, which enables the creation of specific microstructures in thermal barrier coatings (TBCs) used for gas turbine applications. However, the widely varying dimensional scale of pores, ranging from a few nanometers to a few tenths of micrometers, makes it difficult to experimentally measure and analyze porosity in SPS coatings and correlate it with thermal conductivity or other functional characteristics of the TBCs. In this work, an image analysis technique carried out at two distinct magnifications, i.e., low (500×) and high (10,000×), was adopted to analyze the wide range of porosity. Isothermal heat treatment of five different coatings was performed at 1150 • C for 200 h under a controlled atmosphere. Significant microstructural changes, such as inter-columnar spacing widening or coalescence of pores (pore coarsening), closure or densification of pores (sintering) and crystallite size growth, were noticed in all the coatings. The noted changes in thermal conductivity of the coatings following isothermal heat treatment are attributable to sintering, crystallite size growth and pore coarsening.

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“…In addition, sintering can cause an increase in the stiffness of the coating, which increases the stresses and can lead to cracking. [98][99][100] The amount of sintering in YSZ thermal barrier coatings can be reduced by additions of La 2 Zr 2 O 7 . [101] During operation, the thickness of the TGO increases.…”

Section: Stabilitymentioning

confidence: 99%

Zirconia and Pyrochlore Oxides for Thermal Barrier Coatings in Gas Turbine Engines

Fergus

2014

Metallurgical and Materials Transactions E

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One of the important applications of yttria-stabilized zirconia (YSZ) is as a thermal barrier coating for gas turbine engines. While YSZ performs well in this function, the need for increased operating temperatures to achieve higher energy conversion efficiencies, requires the development of improved materials. To meet this challenge, some rare-earth zirconates that form the cubic fluorite-derived pyrochlore structure are being developed for use in thermal barrier coatings due to their low thermal conductivity, excellent chemical stability, and other suitable properties. In this paper, the thermal conductivities of current and prospective oxides for use in thermal barrier coatings are reviewed. The factors affecting the variations and differences in the thermal conductivities and the degradation behaviors of these materials are discussed.

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Sintering and failure behaviour of EB-PVD thermal barrier coating after isothermal treatment

Cited by 79 publications

References 25 publications

Miniaturized bend tests on partially stabilized EB-PVD ZrO2 thermal barrier coatings

Miniaturized bend tests on partially stabilized EB-PVD ZrO2 thermal barrier coatings

Influence of Isothermal Heat Treatment on Porosity and Crystallite Size in Axial Suspension Plasma Sprayed Thermal Barrier Coatings for Gas Turbine Applications

Zirconia and Pyrochlore Oxides for Thermal Barrier Coatings in Gas Turbine Engines

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