Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 38, Issue 4, Pages 1046-1058Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2017.09.050
Keywords
Coating; Carbon/carbon composites; Lanthanum oxide; Long-time ablation
Categories
Funding
- National Natural Science Foundation of China [51472203, 51502245, 51521061]
- 111 Project [B08040]
- Research Fund of State Key Laboratory of Solidification Processing (NWPU), China [142-TZ-2016]
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Long time oxidation protection at ultra-high temperatures or ablation protection has been a choke point for C/C composites. In this study, long time ablation protection of different-La2O3-content (5-30 vol.%) modified ZrC coating for SiC-coated carbon/carbon (C/C) composites was investigated. Results showed that ZrC coating with 15 vol.% La2O3 had good ablation resistance and could protect C/C composites for at least 700 s at 2160 degrees C. A high-thermal-stability and low-oxygen-diffusivity oxide scale containing m-ZrO2 particles and molten phases with La0.1Zr0.9O1.95 and La2Zr2O7 was formed during ablation, offering the ablation protection. La could erode grain boundaries of ZrO2 to refine ZrO2 by short-circuit diffusion and m-ZrO2 particles were retained due to less bulk diffusion than grain-boundary diffusion of La into ZrO2. The erosion resulted in the formation of molten phases containing fine nano-ZrO2, which served as viscous binder among m-ZrO2 particles and crack sealer for the oxide scale.
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