期刊
SURFACE & COATINGS TECHNOLOGY
卷 403, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2020.126418
关键词
C/C composites; Coating; Oxidation behavior; In-situ synthesis; 1973 K
资金
- National Natural Science Foundation of China [51821091, 91860203, 51872239, 51727804, 51872237]
- Innovation Talent Promotion Plan of Shaanxi Province for Science and Technology Innovation Team [2020TD-003]
- China Postdoctoral Science Foundation [2019M660265]
- Fundamental Research Funds for the Central Universities [G2020KY05125]
- Creative Research Foundation of Science and Technology on Thermostructural Composite Materials Laboratory (NWPU), China [614291102010517]
HfB2-MoSi2/SiC-Si coating was fabricated via pack cementation (PC) combined with slurry painting (SP) followed by heat treatment, where MoSi2 was in-situ synthesized from Mo and Si. The microstructure evolution and high-temperature oxidation resistance at 1773 K and 1973 K of the HfB2-MoSi2/SiC-Si coated specimens were comparatively studied. The protection mechanism of the coating was investigated, based on the structure and thermodynamic transformation of the oxide scale. The results revealed that the HfB2-MoSi2/SiC-Si coating possessed better oxidation resistance at 1973 K than that at 1773 K, mainly due to the changed properties of the multiphase Hf-Si-O oxide scale. At 1973 K, the formed Hf-Si-O oxide scale has low oxygen permeability, superior high-temperature stability and self-healing ability. While the Hf-Si-O oxide scale formed at 1773 K is loose, which caused oxygen penetrating into the inner layer and C/C substrate, finally resulting in a high mass loss. This study can provide valuable information and induce facile method to develop high-temperature environmental barrier coatings for C/C composites.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据