Thermal barrier coatings (TBCs) for hydrogen-fueled gas turbines withstand higher combustion temperatures and increased steam concentrations compared to conventional natural-gas systems. These harsh operating conditions significantly accelerate the thermal degradation of widely used YSZ coatings, emphasizing the need for alternative top-coat materials with improved phase stability and reduced thermal conductivity. In this study, rare-earth zirconate ceramics, Gd2Zr2O7 (GdZO), Tm2Zr2O7 (TmZO), and a mixed composition (Gd0.5Tm0.5)2Zr2O7 (Gd/TmZO), were synthesized and investigated as potential next-generation TBC candidates. Each material was comparatively examined with a focus on crystal structure, thermophysical properties, and thermal conductivity. Furthermore, high-temperature steam exposure experiments were performed to simulate hydrogen combustion environments. Microstructural analyses, high-temperature degradation behavior, and phase stability evaluations were carried out to obtain fundamental experimental data. This study provided essential baseline information for the design and development of high-performance TBC materials suitable for the hydrogen-fueled gas turbine systems.

1. Introduction 
2. Experimental 
3. Results and Discussion 
    3.1. 희토류-지르코네이트(A2B2O7)의 상 형성과 미세구조 
    3.2. 기계적, 열적 물성비교 
    3.3. 고온 열화거동 
4. Conclusion 
Funding
Conflict of Interest 
Data Availability Statement 
Author Information and Contribution 
Acknowledgments
References

• 김민지(한국세라믹기술원 이천분원 산업기반융합소재연구단) | Min-Ji Kim (Cross-Functional Ceramics R&D Group, Korea Institute of Ceramic Engineering and Technology, Icheon, Gyeonggi-do 17303, Republic of Korea)
• 김성원(한국세라믹기술원 이천분원 산업기반융합소재연구단) | Seongwon Kim (Cross-Functional Ceramics R&D Group, Korea Institute of Ceramic Engineering and Technology, Icheon, Gyeonggi-do 17303, Republic of Korea) Corresponding author
• 남민수(한국세라믹기술원 이천분원 산업기반융합소재연구단, 고려대학교 신소재공학과) | Min-Soo Nam (Cross-Functional Ceramics R&D Group, Korea Institute of Ceramic Engineering and Technology, Icheon, Gyeonggi-do 17303, Republic of Korea, Department of Materials Science and Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 02841, Republic of Korea)
• 이건웅(한국세라믹기술원 이천분원 산업기반융합소재연구단, 성균관대학교 신소재공학과) | Gun-Woong Lee (Cross-Functional Ceramics R&D Group, Korea Institute of Ceramic Engineering and Technology, Icheon, Gyeonggi-do 17303, Republic of Korea, School of Advanced Materials Science and Engineering, Sungkyunkwan University, Jangan-gu, Suwon, Gyeonggi-do 16419, Republic of Korea)
• 정현석(성균관대학교 신소재공학과) | HyunSuk Jung (School of Advanced Materials Science and Engineering, Sungkyunkwan University, Jangan-gu, Suwon, Gyeonggi-do 16419, Republic of Korea)