Recent progress in thermal/environmental barrier coatings and their corrosion resistance

Chen, Hongfei; Zhang, Chi; Liu, Yuchen; Song, Peng; Li, Wenxian; Yang, Guang; Liu, Bin

doi:10.1007/s12598-019-01307-1

Cited by 64 publications

(24 citation statements)

References 116 publications

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“…The current commercial TBC material is 7-8 wt% Y 2 O 3 partially stabilized ZrO 2 (YSZ), which has good compromise among the selection requirements [3,4]. However, YSZ is vulnerable to molten airborne dust (main components: calciummagnesium-alumino-silicate, CMAS) damage at high operating temperatures [1,[5][6][7][8][9]. This disadvantage decreases the service-life and limits the long-term application of YSZ at enhanced temperatures.…”

Section: Introduction mentioning

confidence: 99%

Corrosion resistance of non-stoichiometric gadolinium zirconate fabricated by laser-enhanced chemical vapor deposition

et al. 2021

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Gadolinium zirconate (GZ) is a promising candidate for next-generation thermal barrier coating (TBC) materials. Its corrosion resistance against calcium-magnesium-alumino-silicate (CMAS) needs to be further increased for enhancing its in-service life. As the Gd element plays an important role in the CMAS resistance, three GZ coatings (GZ-0.75, GZ-1.0, and GZ-1.2) with different Gd/Zr atomic ratios are designed and deposited by laser enhanced chemical vapor deposition (LCVD) in this work. It is found that the generated Gd-apatite in GZ-1.2 would block micro-cracks inside the column structure and the inter-columnar gap more efficiently. Thus, the CMAS penetration rate (5.2 μm/h) of GZ-1.2 decreases over 27% comparing with GZ-1.0 and GZ-0.75, which is even lower than the Gd2Zr2O7 coatings fabricated by electron-beam physical vapor depositions (EB-PVDs). This work provides a feasible way to adjust the coating’s corrosion resistance and may guide the development of future coating for long in-service life.

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Section: Introduction mentioning

confidence: 99%

Corrosion resistance of non-stoichiometric gadolinium zirconate fabricated by laser-enhanced chemical vapor deposition

et al. 2021

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“…Considering these data, it is reasonable to foresee an increase in demand for TBC systems in the near future. A typical TBC system consists of four layers: (i) metallic substrate at the bottom (generally Ni-superalloy), (ii) an intermediate bond coat (BC), (iii) thermally grown (Al 2 O 3 ) oxide (TGO) formed during service, and (iv) a ceramic top coat [ 12 , 13 ]. A schematic TBC system model is represented in Figure 1 .…”

Section: Introductionmentioning

confidence: 99%

Progress in Novel Electrodeposited Bond Coats for Thermal Barrier Coating Systems

Maniam

Paul

2021

Materials

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The increased demand for high performance gas turbine engines has resulted in a continuous search for new base materials and coatings. With the significant developments in nickel-based superalloys, the quest for developments related to thermal barrier coating (TBC) systems is increasing rapidly and is considered a key area of research. Of key importance are the processing routes that can provide the required coating properties when applied on engine components with complex shapes, such as turbine vanes, blades, etc. Despite significant research and development in the coating systems, the scope of electrodeposition as a potential alternative to the conventional methods of producing bond coats has only been realised to a limited extent. Additionally, their effectiveness in prolonging the alloys’ lifetime is not well understood. This review summarises the work on electrodeposition as a coating development method for application in high temperature alloys for gas turbine engines and discusses the progress in the coatings that combine electrodeposition and other processes to achieve desired bond coats. The overall aim of this review is to emphasise the role of electrodeposition as a potential cost-effective alternative to produce bond coats. Besides, the developments in the electrodeposition of aluminium from ionic liquids for potential applications in gas turbines and the nuclear sector, as well as cost considerations and future challenges, are reviewed with the crucial raw materials’ current and future savings scenarios in mind.

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“…At present, the most common thermal barrier coatings are composed of bond coat and ceramic working layer. Among them, the bond coat material is usually MCrAlY (M = Ni and/or Co), and the working layer material is mainly ceramics based on 8 wt.% Y 2 O 3 stable ZrO 2 (8YSZ) [1][2][3][4]. However, 8YSZ coating cannot be applied for a long time under high temperature conditions above 1200 • C, the reason is that when the long-term service temperature is higher than 1200 • C, YSZ will undergo phase transition (t'-ZrO 2 → t-ZrO 2 + c-ZrO 2 ) and sintering, accompanied by thermal physical and mechanical property degradation, strain tolerance reduction, and crack generation, and eventually lead to coating failure [2,5].…”

Section: Introductionmentioning

confidence: 99%

“…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.) [4,[22][23][24], CaO-MgO-Al 2 O 3 -SiO 2 (CMAS) [4,[25][26][27], simulated rain water after CMAS corrosion [28], and high-temperature water vapor [4,29], etc., but there are few literature reports on the corrosion performance of La 2 Zr 2 O 7 thermal barrier coating in seawater corrosive medium [30]. Considering that aircraft engines, turbines and turbine blades may be stored in a marine environment [28], it is necessary to study the corrosion resistance of La 2 Zr 2 O 7 thermal barrier coating in this case.…”

Section: Introductionmentioning

confidence: 99%

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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Recent progress in thermal/environmental barrier coatings and their corrosion resistance

Cited by 64 publications

References 116 publications

Corrosion resistance of non-stoichiometric gadolinium zirconate fabricated by laser-enhanced chemical vapor deposition

Corrosion resistance of non-stoichiometric gadolinium zirconate fabricated by laser-enhanced chemical vapor deposition

Progress in Novel Electrodeposited Bond Coats for Thermal Barrier Coating Systems

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

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