Yb2O3-Modified MoSi2 Ceramic Coating

5.5 h protection at 1800 °C

Enhances ultra-high-temperature oxidation resistance of MoSi2 coatings via Yb2O3 modification, with a gradient structure that effectively suppresses oxygen permeation for long-term protection of tantalum-based materials.

Xiao, Lairong · Guanzhi, Deng · Zhao, Xiaojun · Yuxiang, Jiang · Hongyang, Chen · Qinglong, Yu · Haitao, Dong · 74083047 · Liu, Sainan · Cai, Zhenyang

Journal of the European Ceramic Society 2025

Specifications

Effective protection duration

{'zh': '5.5', 'en': '5.5'} h

Advantages

5.5 h protection at 1800°C

The coating withstands oxidation at 1800°C for 5.5 h, significantly extending service life compared to conventional silicide coatings.

Gradient structure blocks oxygen

The gradient structure comprising a Yb2O3-MoSi2 main layer, TaSi2 diffusion layer, and Ta5Si3 transition layer effectively impedes oxygen ingress.

Yb stabilizes glass network

Yb3+ reduces non-bridging oxygen content, stabilizing the SiO2 network and increasing oxide film viscosity, thereby hindering oxygen diffusion.

Applications

• Ultra-high-temperature protective coatings：Provides oxidation protection at 1800°C for tantalum alloys, extending component lifetime.
• Thermal protection for hypersonic vehicles：Protects leading edges and other ultra-hot parts from oxidation failure.
• Hot-section components for gas turbines：Coatings on hot-section parts resist high-temperature oxidation and corrosion.