4.7 Article

Oxidation behavior of SiC-HfB2-Si coating on C/C composites prepared by slurry dipping combined with gaseous Si infiltration

期刊

SURFACE & COATINGS TECHNOLOGY
卷 385, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2020.125335

关键词

C/C composites; SiC-HfB2-Si coating; Slurry dipping; Gaseous Si infiltration; Oxidation resistance

资金

  1. National Natural Science Foundation of China [91860203, 51821091, 51872239, 51727804, 51872237]
  2. Research Fund of State Key Laboratory of Solidification Processing (NWPU), China [142-TZ-2016]
  3. China Postdoctoral Science Foundation [2019M660265]
  4. Creative Research Foundation of Science and Technology on Thermostructural Composite Materials Laboratory (NWPU), China [614291102010517]

向作者/读者索取更多资源

An effective monolayer SiC-HfB2-Si coating for long-time oxidation protection of C/C composites was designed and prepared by a combined technique of slurry dipping and gaseous Si infiltration (SD + GSI). This coating is dense and adheres well with the C/C substrate, which is ascribed to the formed zigzagged SiC transition layer. After oxidation at 1773 K in static air for >538 h, the mass loss of SiC-HfB2-Si coated samples is only 0.69%. By thermodynamic calculation, the oxidation process of SiC-HfB2-Si coated samples is mainly controlled by oxygen diffusion, and the stable oxidation products are HfO2 + B2O3 + SiO2 + CO. The excellent oxidation protective ability is mostly attributed to the formation of a composite Hf-Si-O glass layer on the coating surface to heal cracks and pores.

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