Study on cyclic thermal corrosion behavior of APS-7YSZ thermal barrier coating at room- and high temperature

Li, Faguo; Xie, Ying; Yang, Li; Zhou, Yue; Zhu, Wang

doi:10.1016/j.ceramint.2021.07.117

Cited by 16 publications

(4 citation statements)

References 44 publications

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“…Al element is insufficient to form a continuously dense Al 2 O 3 barrier layer, and Ni, Cr, and Co diffuse outward through the broken Al 2 O 3 and further react with O 2 . The chemical reaction sequence is as follows Equations () 22–24 (according to ∆ r G m – T diagram): Al 2 O 3 → Cr 2 O 3 → CoO → NiO, and gray (Ni, Co)Cr 2 O 4 is generated in the later stage of oxidation. Literature reported that (Ni, Co)Cr 2 O 4 has high brittleness and less adhesive ability, causing high growth stresses in the TGO layer, 24,25 which degrades the stress tolerance and physical properties of the YSZ layer and eventually leads to severe fracture failure during high‐temperature air exposure (see Figure 11 C1).…”

Section: Resultsmentioning

confidence: 99%

Enhanced structural stability of yttria‐stabilized zirconia–LaMgAl₁₁O₁₉ dual ceramic coating by an α‐Al₂O₃ layer

Tao,

Liu,

Yang

et al. 2024

Int J Applied Ceramic Tech

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To prolong the service life and structural stability of CoCrNiAlY–yttria stabilized zirconia–LaMgAl11O19 (LaMA) dual ceramic coating during high temperature exposure, an AlY plating layer was deposited on top LaMA. Results revealed that this coating without AlY plating layer showed a rapid mass increase from 6.62 mg/cm2 at 20 h to 10.63 mg/cm2 at 80 h, but also suffered from a fast TGO growth and severe elemental diffusion, resulting in an exacerbating interface fracture of the coating. However, AlY plating layer was first oxidized, and Y2O3 induced the formation of a dense α‐Al2O3 reaction layer on the top LaMA layer, which greatly prevented the internal penetration of O2. This coating with AlY plating layer showed a relatively stable structure, a very slow TGO growth, and a slight mass increase trend from 8.19 mg/cm2 at 20 h to 8.73 mg/cm2 at 80 h. Potential oxidation damage mechanisms of the coatings with or without AlY plating layer were comprehensively clarified.

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Section: Resultsmentioning

confidence: 99%

Enhanced structural stability of yttria‐stabilized zirconia–LaMgAl₁₁O₁₉ dual ceramic coating by an α‐Al₂O₃ layer

Tao,

Liu,

Yang

et al. 2024

Int J Applied Ceramic Tech

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“…These molten salts can penetrate the coating at high temperatures and react with the stabilizers in the coating. The phase changes during the reaction can lead to concentrated thermal stresses within the coating, triggering premature coating failure [17]. Therefore, modifying YSZ with rare earth oxides such as La 2 O 3 , Sc 2 O 3 , Gd 2 O 3 , Yb 2 O 3 , and CeO 2 has become a focal point of current research [18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Oxidation Resistance and Molten Salt Corrosion Study of YSZ, CeYSZ, and YSZ/CeYSZ Thermal Barrier Coatings by Atmospheric Plasma Spraying

Li,

Xing,

et al. 2024

Coatings

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Five thermal barrier coatings (TBCs), namely TBC-1 (YSZ), TBC-2 (CeYSZ), TBC-3 (YSZ:CeYSZ = 1:2), TBC-4 (YSZ:CeYSZ = 1:1), and TBC-5 (YSZ:CeYSZ = 2:1), were fabricated using the atmospheric plasma spraying (APS) method. Their oxidation behaviors at 1100 °C and corrosion resistance to molten salts (V2O5 + Na2SO4) at 900 °C were examined. After 100 h of oxidation, the thermally grown oxide layer (TGO) for YSZ primarily contained Cr and Ni oxides with significant internal fractures, presenting a continuous band-like Al2O3. In dual-ceramic configurations, an increase in CeYSZ thickness led to a rise in Al content and reduced Cr and Ni in TGO, with the surface fracture morphing into an internal porosity. Following salt corrosion, YSZ revealed rod-like YVO4 and m-ZrO2 as corrosion products, whereas CeYSZ displayed chain-structured CeO2, CeYO4, and YVO4 combined with m-ZrO2. YSZ coatings underwent notable phase transitions with evident densification, forming a corrosion layer of approximately 10 μm. Conversely, CeYSZ showed a limited phase change, retaining porosity without a distinguishable corrosion layer. As CeYSZ thickness increased from 100 μm to 200 μm in the dual-ceramic structure, salt penetration reduced. Evidently, the dense structure of CeYSZ heightened diffusion resistance against oxygen and corrosive salts, rendering superior oxidation and corrosion resistance over YSZ. By optimizing the thickness ratio between CeYSZ and YSZ, whilst retaining total ceramic layer thickness, the dual-ceramic TBC’s resistance to high-temperature oxidation and corrosion can be enhanced.

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“…4 The most commonly used TC material is yttriastabilized zirconia (YSZ), which is characterized by low thermal conductivity, good phase stability, and high thermal expansion coefficient. [5][6][7] The common BC material is MCrAlY (M: Ni, Co, and Ni + Co), which is necessary to accommodate the thermal expansion misfit between the ceramic coating and the substrate. 8,9 During hightemperature service, there will be a thermally grown oxide (TGO) layer formed between the TC layer and the BC layer, which consists of mixed oxide clusters of chromium (Cr, Al) 2 O 3 , spinel Ni(Cr, Al) 2 O 4 , and nickel oxide NiO (CSN).…”

Section: Introductionmentioning

confidence: 99%

“…The representative TBCs are composed of top coating (TC) and bond coating (BC) applied on the substrate 4 . The most commonly used TC material is yttria‐stabilized zirconia (YSZ), which is characterized by low thermal conductivity, good phase stability, and high thermal expansion coefficient 5–7 . The common BC material is MCrAlY (M: Ni, Co, and Ni + Co), which is necessary to accommodate the thermal expansion misfit between the ceramic coating and the substrate 8,9 .…”

Section: Introductionmentioning

confidence: 99%

Thermal shock resistance of thermal barrier coatings modified by selective laser remelting and alloying techniques

et al. 2022

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Aiming to improve the thermal shock resistance of thermal barrier coatings (TBCs), the plasma-sprayed 7YSZ TBCs were modified by selective laser remelting and selective laser alloying, respectively, in this study. A self-healing agent TiAl 3 was introduced into the 7YSZ TBCs by selective laser alloying to fill cracks during thermal cycling. The thermal shock experiments of the plasma-sprayed, laser-remelted, and laser-alloyed TBCs were conducted by a means of heating and water-quenching method. Results revealed that some segmented microcracks were distributed on the surface of the laser-remelted and the laser-alloyed zones, showing a dense columnar crystal structure. After thermal shock tests, the numbers of segmented microcracks on the laser-remelted coating increased, whereas, in the laser-alloyed condition, some irregular particles formed, leading to the decreased numbers of segmented microcracks. The laser-alloyed coating exhibited the best thermal shock resistance, followed by the laser-remelted condition, with the thermal shock lifetime 3.3 and 2.7 times higher than that of the as-sprayed coating, respectively. On the one hand, both columnar grains and segmented microcracks in the laser-treated zone could effectively improve the strain tolerance of coatings. On the other hand, the oxidation products of TiAl 3 under high-temperature condition could seal the microcracks to postpone the crack connection. Thus, the thermal shock resistance of the laser-treated coatings was significantly improved.

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Study on cyclic thermal corrosion behavior of APS-7YSZ thermal barrier coating at room- and high temperature

Cited by 16 publications

References 44 publications

Enhanced structural stability of yttria‐stabilized zirconia–LaMgAl₁₁O₁₉ dual ceramic coating by an α‐Al₂O₃ layer

Enhanced structural stability of yttria‐stabilized zirconia–LaMgAl₁₁O₁₉ dual ceramic coating by an α‐Al₂O₃ layer

High-Temperature Oxidation Resistance and Molten Salt Corrosion Study of YSZ, CeYSZ, and YSZ/CeYSZ Thermal Barrier Coatings by Atmospheric Plasma Spraying

Thermal shock resistance of thermal barrier coatings modified by selective laser remelting and alloying techniques

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Study on cyclic thermal corrosion behavior of APS-7YSZ thermal barrier coating at room- and high temperature

Cited by 16 publications

References 44 publications

Enhanced structural stability of yttria‐stabilized zirconia–LaMgAl11O19 dual ceramic coating by an α‐Al2O3 layer

Enhanced structural stability of yttria‐stabilized zirconia–LaMgAl11O19 dual ceramic coating by an α‐Al2O3 layer

High-Temperature Oxidation Resistance and Molten Salt Corrosion Study of YSZ, CeYSZ, and YSZ/CeYSZ Thermal Barrier Coatings by Atmospheric Plasma Spraying

Thermal shock resistance of thermal barrier coatings modified by selective laser remelting and alloying techniques

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Enhanced structural stability of yttria‐stabilized zirconia–LaMgAl₁₁O₁₉ dual ceramic coating by an α‐Al₂O₃ layer

Enhanced structural stability of yttria‐stabilized zirconia–LaMgAl₁₁O₁₉ dual ceramic coating by an α‐Al₂O₃ layer