Environmental degradation of thermal-barrier coatings by molten deposits

Levi, Carlos G.; Hutchinson, John W.; Vidal-Sétif, M.H.; Johnson, Curtis A.

doi:10.1557/mrs.2012.230

Cited by 463 publications

(355 citation statements)

References 39 publications

(31 reference statements)

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“…Um grande esforço de pesquisa vem sendo direcionado [9,72,73]. Este ataque ocorre em função da ingestão de finas partículas provenientes do ambiente, como areia, cinza vulcânica, etc.…”

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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Section: Outros Fatores De Melhoria De Desempenhounclassified

Revestimentos para barreira térmica: evolução e perspectivas

Lima

2014

Soldag. insp.

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“…Therefore, KIC should be improved to enhance the thermal durability of the YGYZ coating. In addition, YGYZ coating is less compatible with thermally grown oxide (TGO) layer than 8YSZ coating, resulting in premature failure of YGYZ-based TBC in working environments [24,25].…”

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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“…Generally, interface oxidation, erosion caused by the exotic particles, and corrosion induced by the molten CaO-MgO-Al 2 O 3 -SiO 2 (CMAS) are regarded as three key factors leading to the failure of TBCs [4][5][6][7]. The third two issues have been investigated systematically [5,6,8], whereas the third one still needs to be further understood [7].…”

Section: Introductionmentioning

confidence: 99%

“…The third two issues have been investigated systematically [5,6,8], whereas the third one still needs to be further understood [7]. It is considered that the molten CMAS results from the ingestion of siliceous minerals (dust, sand, and volcanic ash) within the intake air during flight [7,9,10].…”

Section: Introductionmentioning

confidence: 99%