Effectiveness of lanthanum zirconate and Yttria stabilised zirconia freestanding APS thermal barrier coatings against natural CMAS attack at high temperatures

Satpathy, R. K.; Rani, I. Sophia; Alam, Zafir; Besra, Laxmidhar

doi:10.1080/09603409.2020.1811600

Cited by 7 publications

(4 citation statements)

References 34 publications

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“…To our best knowledge, there are no other literature reports on the preparation of La 2 Zr 2 O 7 thermal barrier coating by laser cladding except for our report [9]. However, there have been a large number of literature reports on the preparation of other thermal barrier coatings by laser cladding [8,[10][11][12] and the preparation of La 2 Zr 2 O 7 thermal barrier coatings by plasma spraying [13][14][15][16] and electron beam-physical vapor deposition [17][18][19][20][21]. In addition, there are a large number of literature reports on the corrosion performance of La 2 Zr 2 O 7 thermal barrier coatings under oxygen [9,16,20,21], molten salts or oxides (such as Na 2 SO 4 , V 2 O 5 , etc.)…”

Section: Introductionmentioning

confidence: 89%

Microstructure and Corrosion Properties of La2Zr2O7/NiCoAlY Thermal Barrier Coatings Deposited on Inconel 718 Superalloy by Laser Cladding

Huang

Pan

et al. 2021

Coatings

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In order to improve the seawater corrosion resistance of Inconel 718 superalloy, a La2Zr2O7/NiCoCrAlY thermal barrier coating corrosion resistant to 3.5 wt.% NaCl aqueous solution was prepared by laser cladding on Inconel 718 superalloy. X-ray diffraction (XRD), Scanning Electron Microscope (SEM), and electrochemical techniques were used to study the microstructure and the corrosion performance of the coating in 3.5 wt.% NaCl solution. The results show that the thermal barrier coating is mainly composed of primary La2Zr2O7 phase and γ + laves/δ phase eutectic structure. The corrosion potential and corrosion current of the coating in 3.5 wt.% NaCl solution are higher and lower than that of the Inconel 718 substrate, respectively, indicating that the corrosion performance of the coating is better than that of the Inconel 718 substrate. The presence of La2Zr2O7 phase in the thermal barrier coating is the main reason for its corrosion resistance to 3.5 wt.% NaCl solution.

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Section: Introductionmentioning

confidence: 89%

Microstructure and Corrosion Properties of La2Zr2O7/NiCoAlY Thermal Barrier Coatings Deposited on Inconel 718 Superalloy by Laser Cladding

Huang

Pan

et al. 2021

Coatings

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“…Satpathy et al [33] investigated the potential of two kinds of thermal barrier coatings (TBCs), APS lanthanum zirconate (LZ) and APS 8 wt% yttria stabilized zirconia (YSZ), for usage in advanced gas turbine components. The coatings were tested for resistance to corrosive calcium-magnesium-aluminosilicate (CMAS) deposits.…”

Section: Lanthanum Zirconate (Lzo)mentioning

confidence: 99%

Recent Development in Advance Ceramic Materials and Understanding the Mechanisms of Thermal Barrier Coatings Degradation

Iqbal

Moskal

2023

Arch Computat Methods Eng

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Metallic alloys' behavior at high temperatures, especially their response to corrosion and formation of protective surface layers, has long been a focus of scientific inquiry. Although certain alloy compositions require an initiation period before hot corrosion advances to the propagation stage, no combination of alloys can be considered impervious to hot corrosion indefinitely. The capacity of nickel-based materials to tolerate extreme circumstances such high temperatures, acidity, corrosion, and scratching is highly valued. However, they are unable to satisfy the strict demands of today's high-temperature applications. The durability of thermal barrier coatings (TBCs), which are prone to oxidation, rust, and degradation from sulphates and foreign object damage, has been the subject of recent study. For sophisticated ceramic materials exposed to high temperatures, hot rust degradation poses a considerable challenge. The main objective of this study is to investigate the effects of severe degradation on several advanced ceramic material types and their level of advancement. The purpose of the inquiry is to comprehend the deteriorating processes at the long term working condition, including the function of oxidation and liquid salts. Additionally, we investigate the effects of temperature, environment, and contact duration on the heated weathering behavior of earthenware. Finally, we discuss strategies for mitigating hot corrosion degradation in ceramics, such as protective coatings like new design of TBCs, doping, and composition optimization. This paper aims to offer a thorough understanding of the hot corrosion behavior of ceramics, which is crucial for developing durable materials suitable for high-temperature applications. Additionally, it explores the fabrication of protective coatings and addresses the challenges faced in this regard. The insights gained from this research can contribute to the advancement of resilient ceramic fabrics and the development of effective protective coatings.

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“…was used for doping Gd 2 Zr 2 O 7 , modifying its poor fracture toughness and thermal expansion coefficient, and enhancing the corrosion resistance and reducing the thermal conductivity further [84][85][86]. The application of La 2 Zr 2 O 7 with low thermal conductivity, high phase stability, and good corrosion resistance is limited by its low fracture toughness [87][88][89]. Nd, Dy oxides were also employed to improve the fracture toughness and reduce the thermal conductivity [90].…”

Section: A 2 B 2 O 7 Type Compoundsmentioning

confidence: 99%

Research Progresses on Ceramic Materials of Thermal Barrier Coatings on Gas Turbine

Zhao

et al. 2021

Coatings

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Thermal barrier coatings (TBCs) play a vitally important role in protecting the hot parts of a gas turbine from high temperature and corrosion effectively. More and more attention has been paid to the performance modification of ZrO2-based ceramics and seeking for new ceramic materials to meet requirements of gas turbine TBCs. The working principle, merits, and demerits of main technologies for coating preparation are elaborated in this paper, and the properties of new ceramic materials are reviewed. It is found that the thermal conductivity, thermal stability, mechanical properties, and other performances of traditional ZrO2-based ceramics could be improved effectively by doping modification. The emphases for new ceramic materials research were put on pyrochlores, magnetoplumbites, rare-earth tantalates, etc. Rare-earth tantalates with great potentials as new top ceramic materials were described in detail. In the end, the development directions of advanced top ceramic coatings, combining doping modification with preparation technology to regulate and control structure property of high-performance ceramic material, were put forward.

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Effectiveness of lanthanum zirconate and Yttria stabilised zirconia freestanding APS thermal barrier coatings against natural CMAS attack at high temperatures

Cited by 7 publications

References 34 publications

Microstructure and Corrosion Properties of La2Zr2O7/NiCoAlY Thermal Barrier Coatings Deposited on Inconel 718 Superalloy by Laser Cladding

Microstructure and Corrosion Properties of La2Zr2O7/NiCoAlY Thermal Barrier Coatings Deposited on Inconel 718 Superalloy by Laser Cladding

Recent Development in Advance Ceramic Materials and Understanding the Mechanisms of Thermal Barrier Coatings Degradation

Research Progresses on Ceramic Materials of Thermal Barrier Coatings on Gas Turbine

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