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<p>A rapidly advancing research area within the aerospace industry is the development of innovative thermal barrier coating (TBC) materials that enhance high-temperature corrosion resistance. This study investigated four different combinations of thermal barrier coatings on a nickel-based superalloy, Inconel 718 (In-718) substrate, employing an atmospheric plasma spray technique (APST). The study on thermal barrier coatings (TBCs) examines yttria-stabilized zirconia (YSZ), lanthanum zirconate (LZ), and their composite systems produced with various YSZ/LZ weight ratios. Corrosive salts, sodium sulfate (Na<sub>2</sub>SO<sub>4</sub>) and vanadium pentoxide (V<sub>2</sub>O<sub>5</sub>), were applied at a specific ratio on the top surface of the TBCs, and their corrosive behavior was examined through high-temperature exposure (1273&#xa0;K) for 60 hours. The metallurgical behavior of the specimens were examined using field emission scanning electron microscopy (FESEM), energy-dispersive spectroscopy (EDS), and x-ray diffraction (XRD) to identify chemical and physical changes in the coating. The 80%YSZ/20%LZ combination exhibits superior corrosion resistance compared to YSZ, LZ, and the 60%YSZ/40%LZ coating. The hot corrosion kinetic products, m-t-ZrO<sub>2</sub>, YVO<sub>4</sub>, and LaVO<sub>4</sub>, reveal an optimal mix of TBC at 80%YSZ/20%LZ, with minimal delamination, spalling, cracks, and voids after the hot corrosion cycle. The TBC with 80% YSZ provides higher thermal resistance, and 20% LZ contributes to enhanced mechanical properties.</p>

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Assessment on High-Temperature Corrosive Failure of Yttria-Stabilized Zirconia-Lanthanum Zirconate Thermal Barrier-Coated Inconel 718 Alloy with Various Weight Ratios

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • A. Balamurugan,
  • P. Jeyapandiarajan

摘要

A rapidly advancing research area within the aerospace industry is the development of innovative thermal barrier coating (TBC) materials that enhance high-temperature corrosion resistance. This study investigated four different combinations of thermal barrier coatings on a nickel-based superalloy, Inconel 718 (In-718) substrate, employing an atmospheric plasma spray technique (APST). The study on thermal barrier coatings (TBCs) examines yttria-stabilized zirconia (YSZ), lanthanum zirconate (LZ), and their composite systems produced with various YSZ/LZ weight ratios. Corrosive salts, sodium sulfate (Na2SO4) and vanadium pentoxide (V2O5), were applied at a specific ratio on the top surface of the TBCs, and their corrosive behavior was examined through high-temperature exposure (1273 K) for 60 hours. The metallurgical behavior of the specimens were examined using field emission scanning electron microscopy (FESEM), energy-dispersive spectroscopy (EDS), and x-ray diffraction (XRD) to identify chemical and physical changes in the coating. The 80%YSZ/20%LZ combination exhibits superior corrosion resistance compared to YSZ, LZ, and the 60%YSZ/40%LZ coating. The hot corrosion kinetic products, m-t-ZrO2, YVO4, and LaVO4, reveal an optimal mix of TBC at 80%YSZ/20%LZ, with minimal delamination, spalling, cracks, and voids after the hot corrosion cycle. The TBC with 80% YSZ provides higher thermal resistance, and 20% LZ contributes to enhanced mechanical properties.