Influence of temperature on phase stability and thermal conductivity of single- and double-ceramic-layer EB–PVD TBC top coats consisting of 7YSZ, Gd2Zr2O7 and La2Zr2O7

Bobzin, Kirsten; Bagcivan, Nazlim; Brögelmann, Tobias; Yıldırım, Bora

doi:10.1016/j.surfcoat.2013.08.013

Cited by 83 publications

(36 citation statements)

References 46 publications

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“…As shown in Fig. 6, the EB-PVD deposited LZ coating microstructure has a fine columnar 11 microstructure that results in a higher strain tolerance [31]. Typically, EB-PVD deposited coating has a higher thermal conductivity than APS sprayed coatings at the same porosity level.…”

Section: Eb-pvd Deposited Coatingmentioning

confidence: 97%

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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Section: Eb-pvd Deposited Coatingmentioning

confidence: 97%

Lanthanum zirconate based thermal barrier coatings: A review

Zhang

Guo

Jung

et al. 2017

Surface and Coatings Technology

192

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“…In addition, in the layered structure, the thermal and residual stresses generated among layers due to the CTE mismatch become the most important reasons for failure [3]. The CTE value of Ni-based bond coat is usually ~1510 for bulk 8YSZ [26][27][28]. Therefore, large CTE is preferred for the ceramic top coat to enhance the thermal durability.…”

Section: Furnace Cyclic Thermal Fatigue Testmentioning

confidence: 99%

“…One of the solutions to improve the thermal durability of YGYZ coatings as mentioned above is the layered TBC with multifunctions through structural design [26].…”

Section: Introductionmentioning

confidence: 99%

Thermal durability and fracture behavior of layered Yb-Gd-Y-based thermal barrier coatings in thermal cyclic exposure

Jung

et al. 2017

Surface and Coatings Technology

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The effects of structural design on the thermal durability of Yb-Gd-Y-based thermal barrier coatings (TBCs) were investigated through thermal cyclic exposure tests, such as furnace cyclic thermal fatigue (FCTF) and jet engine thermal shock (JETS) tests. The effects of composition in the bond coat and feedstock purity for the buffer layer on its lifetime performance were also examined. To overcome the drawbacks of Yb-Gd-Y material with poor thermal durability due to poor mechanical properties and low coefficient of thermal expansion, a buffer layer was introduced in the Yb-Gd-Y-based TBC systems. In the FCTF tests, the TBC with the CoNi-based bond coat and the buffer layer of regular purity showed a longer lifetime performance than other TBCs, especially the TBCs without the buffer layer.In the JETS tests, the TBC with the Ni-based bond coat and the buffer layer of high purity showed a sound condition after 2000 cycles, showing better interfacial stability for TBC with the Ni-based bond coat rather than that with the CoNi-based bond coat in the single layer coatings without the buffer layer. The buffer layer effectively enhanced the thermal durability in slow temperature change, while the bond-coat composition and the feedstock purity for the buffer layer were found to be important factor to improve the thermal durability of the TBC in fast temperature change. Finally, these research findings allow us to control the structure, composition, and feedstock purity in TBC system for improving the thermal durability in cyclic thermal environments.

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“…Diversas pesquisas vêm sendo realizadas também na busca de alternativas à ZircÓnia parcialmente estabilizada (YSZ), especialmente objetivando redução na condutividade térmica do TBC, ou seja, maior capacidade de isolamento térmico do revestimento para mais altas temperaturas de trabalho [65][66][67][68]. O desafio maior é encontrar alternativas que ofereçam a mesma condição de comportamento mecânico do revestimento YSZ.…”

Section: Outros Fatores De Melhoria De Desempenhounclassified

Revestimentos para barreira térmica: evolução e perspectivas

Lima

2014

Soldag. insp.

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Resumo Palavras-chave: Revestimento para barreira térmica; TBC; Aspersão térmica; Metal-cerâmica. Abstract: For over four decades, thermal barrier coatings, or simply TBC, have been decisive for the performance of gas turbines in aviation and aerospace, and more recently also in the performance of power generation turbines and diesel engines. Its importance overlaps the developments achieved in the area

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Influence of temperature on phase stability and thermal conductivity of single- and double-ceramic-layer EB–PVD TBC top coats consisting of 7YSZ, Gd2Zr2O7 and La2Zr2O7

Cited by 83 publications

References 46 publications

Lanthanum zirconate based thermal barrier coatings: A review

Lanthanum zirconate based thermal barrier coatings: A review

Thermal durability and fracture behavior of layered Yb-Gd-Y-based thermal barrier coatings in thermal cyclic exposure

Revestimentos para barreira térmica: evolução e perspectivas

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