Enhancing oxygen‐blocking properties of HfB <sub>2</sub> ‐MoSi <sub>2</sub> ‐SiC coating by CeO <sub>2</sub> modification
Abstract To alleviate the destructive alteration of the glass layer surface caused by gas evolution during the oxygen‐blocking process of the HfB 2 ‐MoSi 2 ‐SiC coating, CeO 2 was incorporated to modify HfB 2 ‐MoSi 2 ‐SiC coating, and the anti‐oxidation mechanism at 1700°C in air was investigated. Compared with the unmodified HfB 2 ‐MoSi 2 ‐SiC coating, the addition of the refractory CeO 2 to the Hf‐B‐Si‐O system leads to the formation of a stable Hf‐Ce‐B‐Si‐O complex phase glass, which substantially enhances the viscosity, stability, and self‐healing sealing properties of the glass layer. The introduction of 0.75 vol.% CeO 2 significantly lowers the oxidative activity of the HfB 2 ‐MoSi 2 ‐SiC coating, boosting its average protective efficiency to 99.96% and reducing the maximal oxygen permeability by 43.48%, thus exhibiting superior oxygen‐blocking performance. However, excessive addition of CeO 2 leads to an overabundance of oxygen release through its distinctive oxygen vacancy mechanism, which accelerates the formation of Hf‐oxides, resulting in excessive viscosity on the coating surface and leaving oxidation defects unrepaired.
Authors
- Leihua Xu
- Е. А. Левашов (ORCID: https://orcid.org/0000-0002-0623-0013)
- Baojing Zhang (ORCID: https://orcid.org/0009-0001-3922-8753)
- Xuanru Ren (ORCID: https://orcid.org/0000-0002-9390-2825)
- Xueqin Kang (ORCID: https://orcid.org/0000-0002-2038-3331)
- Ping Zhang (ORCID: https://orcid.org/0000-0001-9934-6084)
- Ph. V. Kiryukhantsev–Korneev (ORCID: https://orcid.org/0000-0003-1635-4746)
- Peipei Wang (ORCID: https://orcid.org/0000-0003-4482-6149)
- Xiang Ji (ORCID: https://orcid.org/0000-0002-7234-6460)
- Yuexing Chen (ORCID: https://orcid.org/0000-0002-6879-2433)
- Sheng Zhang (ORCID: https://orcid.org/0000-0001-6253-5172)
- Ji Shi
Institutions
- Xi'an University of Science and Technology (CN)
- Tokyo Institute of Technology (JP)
- National University of Science and Technology (RU)
- China University of Petroleum, Beijing (CN)
- Harbin Institute of Technology (CN)
- China University of Mining and Technology (CN)
- National University of Science and Technology (ZW)
- Henan Academy of Sciences (CN)
Publication Details
- Journal
- Journal of the American Ceramic Society
- Published
- 2024-11-25
- DOI
- https://doi.org/10.1111/jace.20266
- Citations
- 7
- Primary Topic
- Advanced ceramic materials synthesis
- Type
- article
- Field-Weighted Citation Impact
- 1.64
Funders
- Fundamental Research Funds for the Central Universities