Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 722, Issue -, Pages 69-76Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.06.008
Keywords
C/C composites; Oxidation; Surface analysis; Heat treatment
Categories
Funding
- National Natural Science Foundation of China [51272212, 51672223, 51521061]
- 111 project [08040]
- Research Fund of the State Key Laboratory of Solidification Processing (NWPU), China [142-TZ-2016, 98-QZ-2014]
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A brand new HfB2-SiC-MoSi2 coating was fabricated to protect carbon/carbon (C/C) composites with inner SiC coating from oxidation, which was prepared by in-situ synthesis. In this paper, the C/C substrate with the protection of the HfB2-SiC-MoSi2/SiC coating could resist oxidation in 1773 K air for 408 h. The double coating also presented expected oxidation protection performance at dynamic oxidation environment. In the test process, the surface coating was oxidized to form a self-sealing silicate glass layer containing HfO2 and HfSiO4, which could hinder crack propagation in coating. (C) 2017 Published by Elsevier B.V.
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