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Open Access Review Issue
Progress in ceramic materials and structure design toward advanced thermal barrier coatings
Journal of Advanced Ceramics 2022, 11 (7): 985-1068
Published: 02 July 2022
Downloads:578

Thermal barrier coatings (TBCs) can effectively protect the alloy substrate of hot components in aeroengines or land-based gas turbines by the thermal insulation and corrosion/erosion resistance of the ceramic top coat. However, the continuous pursuit of a higher operating temperature leads to degradation, delamination, and premature failure of the top coat. Both new ceramic materials and new coating structures must be developed to meet the demand for future advanced TBC systems. In this paper, the latest progress of some new ceramic materials is first reviewed. Then, a comprehensive spalling mechanism of the ceramic top coat is summarized to understand the dependence of lifetime on various factors such as oxidation scale growth, ceramic sintering, erosion, and calcium-magnesium-aluminium-silicate (CMAS) molten salt corrosion. Finally, new structural design methods for high-performance TBCs are discussed from the perspectives of lamellar, columnar, and nanostructure inclusions. The latest developments of ceramic top coat will be presented in terms of material selection, structural design, and failure mechanism, and the comprehensive guidance will be provided for the development of next-generation advanced TBCs with higher temperature resistance, better thermal insulation, and longer lifetime.

Open Access Research Article Issue
Study on water corrosion behavior of ZrSiO4 materials
Journal of Advanced Ceramics 2018, 7 (4): 336-342
Published: 21 November 2018
Downloads:30

ZrSiO4 bulk was prepared by pressureless sintering process and ZrSiO4 coating was deposited on the SiCf/SiC substrate using air plasma method. The microstructures of ZrSiO4 bulk and ZrSiO4 coating are both dense. A preliminary study of a water vapor corrosion test for ZrSiO4 bulk and ZrSiO4 coating was performed under the conditions of 1.013×105 Pa, 90%H2O/10%O2, 1300 ℃, and low gas velocity. Results show that some pores appear on the surface of the ZrSiO4 bulk. The main crystal phase is ZrO2 and the weight loss of ZrSiO4 bulk is only 0.236 mg/cm2 after corrosion. The ZrSiO4 coating peels off from the substrate after 109 h. The number and intensity of diffraction peaks of ZrO2 in the coating increase, and the major crystal phase of the coating is still ZrSiO4. A porous microstructure accompanied with cracks is observed on the surface of ZrSiO4 coating after corrosion.

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