Melting index characterization and thermal conductivity model of plasma sprayed YSZ coatings

Wang, Yongzhe; Hua, Jian; Liu, Ziwei; Zeng, Yi; Zhou, Ying; Wang, Hu

doi:10.1016/j.jeurceramsoc.2012.05.030

Cited by 23 publications

(6 citation statements)

References 23 publications

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“…It is well established that the microstructure and properties of the plasma sprayed coating is strongly dependent on the original feedstock powders. The features of the feedstock powders, such as morphology, density, microstructure, and size distribution, will affect the heat and momentum transfer between the powder and plasma jet, causing the differences in the velocity and melting state when these particles stack to form a splat‐based multilayered structure 6,7,14,24−26 . Therefore, various feedstock powders have been used to optimize the microstructure and properties of APS TBCs.…”

Section: Introductionmentioning

confidence: 99%

Sintering behavior of a nanostructured thermal barrier coating deposited using electro‐sprayed particles

Chen

Shan

et al. 2020

J Am Ceram Soc

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During high temperature service, a series of microstructure and phase evolutions occur in thermal barrier coatings (TBCs), which result in degradation of thermal insulation and durability. In this study, the sintering behavior of an air plasma sprayed 8 wt% YSZ coating deposited using electro-sprayed nanostructured particles (ESP) as feedstock powder was investigated and compared with conventional YSZ coating deposited using hollow spherical powders (HOSP). Due to the distinct asymmetric porous structure formed by nanosized YSZ particles, the ESP powder was partially melted in the plasma jet during the deposition, which resulted in the formation of a nanostructured coating that consisted of porous nanozones and dense zones. The ESP coating not only shows a significantly lower initial thermal conductivity of 0.70 W/ mK, but also exhibits a stronger sintering resistance in terms of phase stability and thermal insulation compared to the conventional coating. When subjected to prolonged sintering at 1400°C for 128 hours, the thermal conductivity of the ESP coating would gradually increase to about half that of the HOSP coating at 1.29 W/mK. These differences are ascribed to the interaction among different sintering behavior between nanozones and dense zones.

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Section: Introductionmentioning

confidence: 99%

Sintering behavior of a nanostructured thermal barrier coating deposited using electro‐sprayed particles

Chen

Shan

et al. 2020

J Am Ceram Soc

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“…They found that the presence of the pores disturbed the heat 31 transfer in their models. In addition, the thermal conductivity of plasma sprayed porous YSZ was investigated by many researchers using FE method [95,96]. The calculated effective thermal conductivities were in good agreement with experimental results.…”

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confidence: 63%

Lanthanum zirconate based thermal barrier coatings: A review

Zhang

Guo

Jung

et al. 2017

Surface and Coatings Technology

192

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This review article summarizes the latest information about the manufacturing techniques of lanthanum zirconate (La2Zr2O7, LZ) powder and La2Zr2O7 based thermal barrier coatings (TBCs). Lanthanum zirconate is a promising candidate material for TBC applications, due to its lower thermal conductivity and higher thermal stability compared to other traditional TBC systems. In this work, the physical, thermal, and mechanical properties of the powder and coatings are evaluated. The durability experiments of the TBCs in various thermal, mechanical, and corrosive conditions is also reviewed. In addition, theoretical studies on the powder and coatings properties are presented. Finally, future research directions of lanthanum zirconate as TBC applications are proposed.

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“…They found that the presence of the pores disturbed heat flow in materials. In addition, the thermal conductivity of plasma sprayed porous yttria-stabilized zirconia (YSZ) was investigated by several researchers using FE method 6 [27,28]. The calculated effective thermal conductivities were in good agreement with experimental results.…”

Section: Introductionmentioning

confidence: 76%

Image-based multi-scale simulation and experimental validation of thermal conductivity of lanthanum zirconate

Guo

Wei

et al. 2016

International Journal of Heat and Mass Transfer

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Lanthanum zirconate (La 2 Zr 2 O 7) is a promising candidate material for thermal barrier coating (TBC) applications due to its low thermal conductivity and high-temperature phase stability. In this work, a novel image-based multi-scale simulation framework combining molecular dynamics (MD) and finite element (FE) calculations is proposed to study the thermal conductivity of La 2 Zr 2 O 7 coatings. Since there is no experimental data of single crystal La 2 Zr 2 O 7 thermal conductivity, a reverse non-equilibrium molecular dynamics (reverse NEMD) approach is first employed to compute the temperature

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Melting index characterization and thermal conductivity model of plasma sprayed YSZ coatings

Cited by 23 publications

References 23 publications

Sintering behavior of a nanostructured thermal barrier coating deposited using electro‐sprayed particles

Sintering behavior of a nanostructured thermal barrier coating deposited using electro‐sprayed particles

Lanthanum zirconate based thermal barrier coatings: A review

Image-based multi-scale simulation and experimental validation of thermal conductivity of lanthanum zirconate

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