Assessment of the Thermal Conductivity of Yttria-Stabilized Zirconia Coating

An, Kyong Jun

doi:10.2320/matertrans.m2013172

Cited by 6 publications

(6 citation statements)

References 10 publications

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“…The authors calculated the thermal stresses occurring in the pipe wall using a commercial heat transfer code. The results of this modelling were compared with the analytical approach that is used in the paper [15]. In [15], the thermal conductivity of the TBCs system is investigated.…”

Section: Numerical Modellingmentioning

confidence: 99%

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A mathematical model of the double-pipe system with TBCs application

Granda

Trojan

2021

E3S Web Conf.

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Following Rankine’s cycle efficiency, steam with ever-higher parameters is used to improve the efficiency of advanced ultra-supercritical power plants. The high steam parameters require the use of expensive high-alloy steels. Therefore, design concepts with reduced investment costs are more and more popular. In the power industry, the use of thermal barrier coatings to protect components exposed to high temperatures is becoming ever more common. The innovative concept is a double-pipe system with a thermal barrier that provides insulation for the primary pipe, in which ultra-supercritical steam flows. On the outside, the pipe is cooled by lower performance steam. The following paper presents a two-dimensional mathematical model of the proposed solution. A set of heat transfer equations allows the determination of the temperature field in the steady and transient-state operation of such a system. The numerical model is compared with the CFD one. The temperature gradient in the inner pipe wall with and without coating was determined. In addition, the response of the wall temperature to the step-change of the steam temperature was investigated. The paper shows that the use of TBCs allows reducing high-alloy steels and improving the handling properties of thick-walled components.

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Section: Numerical Modellingmentioning

confidence: 99%

“…The results of this modelling were compared with the analytical approach that is used in the paper [15]. In [15], the thermal conductivity of the TBCs system is investigated. In the mentioned works, commercial codes were used to calculate the heat transfer processes.…”

Section: Numerical Modellingmentioning

confidence: 99%

A mathematical model of the double-pipe system with TBCs application

Granda

Trojan

2021

E3S Web Conf.

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“…These coatings are applied to protect the metallic components against degradation due to high‐temperature (> 1200°C) exposure. An added benefit of YSZ TBCs is their thermal insulation allows higher turbine operating temperatures, thereby increasing their efficiency and performance 6–8 . The effect of partially doping zirconia with yttria on the change in metastable transformation temperature can be seen in the pseudo‐binary yttria–zirconia phase diagram 9 …”

Section: Introductionmentioning

confidence: 99%

On the oxygen vacancy annealing in air plasma sprayed yttria‐stabilized zirconia thermal barrier coatings

Hastak,

Gildersleeve,

Batna

et al. 2023

J Am Ceram Soc.

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Yttria‐stabilized zirconia (t’‐YSZ) thermal barrier coatings (TBCs) were deposited by air plasma spraying (APS) using commercial purity and high‐purity feedstock powders. The coatings were subjected to short‐term, low‐temperature annealing (500–1200°C for 30 min). Significant structural changes were observed by X‐ray diffraction and Raman spectroscopy. These changes were attributed to annihilation of excess oxygen vacancies created by the process. APS induces partial reduction of YSZ due to the reducing potential of the high‐temperature and hydrogen‐rich plasma environment. Laser flash thermal conductivity, impulse excitation elastic modulus, and dilatometric measurements show significant changes in the YSZ during the short‐term low‐temperature thermal exposure, concurrent to the vacancy annealing. The results were analyzed in terms of the coating chemistry and the processing environment. High‐purity coatings exhibited larger increment in thermal conductivity and elastic modulus than commercial purity coatings.

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“… 7 , 8 At present, yttria-stabilized zirconia (YSZ) has been one of the most widely used TBC materials. 9 , 10 A stable or partially stable structure can be formed at high temperatures with Y 2 O 3 added as a stabilizer to ZrO 2 to effectively alleviate the thermal mismatch problem of the ceramic layer and improve the bonding strength between the ceramic coating and the substrate. 11 The bonding strength is an important indicator to measure the bonding of the ceramic coating and the substrate.…”

Section: Introductionmentioning

confidence: 99%

“…Gas turbines have been key heat-to-power conversion devices in the field of power generation since their inception, and improvement of their thermal efficiency has become an important research direction for scientific researchers. , However, the improvement of thermal efficiency of a gas turbine requires a significant increase in the operating temperature of the combustion chamber, which brings new challenges to maximize the operating temperature of the gas turbine components . Thermal barrier coatings (TBCs) have been widely used for hot metal parts in advanced gas turbines and diesel engines to improve thermal protection to improve the thermal efficiency and performance. − The TBC system refers to a complex coating system composed of a metal substrate, a bonding layer, and a surface ceramic coating. , At present, yttria-stabilized zirconia (YSZ) has been one of the most widely used TBC materials. , A stable or partially stable structure can be formed at high temperatures with Y 2 O 3 added as a stabilizer to ZrO 2 to effectively alleviate the thermal mismatch problem of the ceramic layer and improve the bonding strength between the ceramic coating and the substrate . The bonding strength is an important indicator to measure the bonding of the ceramic coating and the substrate .…”

Section: Introductionmentioning

confidence: 99%

Machine Learning-Assisted Design of Yttria-Stabilized Zirconia Thermal Barrier Coatings with High Bonding Strength

Chen

et al. 2022

ACS Omega

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As a high-quality thermal barrier coating material, yttria-stabilized zirconia (YSZ) can effectively reduce the temperature of the collective materials to be used on the surface of gas turbine hot-end components. The bonding strength between YSZ and the substrate is also one of the most important factors for the applications. Herein, the Gaussian mixture model (GMM) and support vector regression (SVR) were used to construct a machine learning model between YSZ coating bonding strength and atmospheric plasma spraying (APS) process parameters. First, GMM was used to expand the original 8 data points to 400 with the R value of leave-one-out cross-validation improved from 0.690 to 0.990. Then, the specific effects of APS process parameters were explored through Shapley additive explanations and sensitivity analysis. Principal component analysis was used to explain the constructed model and obtain the optimized area with a high bonding strength. After experimental validation, the results showed that under the APS process parameters of a current of 617 A, a voltage of 65 V, a H 2 flow of 3 L min –1 , and a thickness of 200 μm, the bonding strength increased by more than 19% to 55.5 MPa compared with the original maximum value of 46.6 MPa, indicating that the constructed GMM–SVR model can accurately predict the bonding strength of YSZ coating.

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Assessment of the Thermal Conductivity of Yttria-Stabilized Zirconia Coating

Cited by 6 publications

References 10 publications

A mathematical model of the double-pipe system with TBCs application

A mathematical model of the double-pipe system with TBCs application

On the oxygen vacancy annealing in air plasma sprayed yttria‐stabilized zirconia thermal barrier coatings

Machine Learning-Assisted Design of Yttria-Stabilized Zirconia Thermal Barrier Coatings with High Bonding Strength

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