期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 765, 期 -, 页码 37-45出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.06.230
关键词
Carbon/carbon composites; Oxidation resistance; La2O3; ZrB2-SiC
资金
- National Natural Science Foundation of China [51521061, 51502245]
- Natural Science Basic Research Plan in Shaanxi Province of China [2017JM5009]
- Creative Research Foundation of Science and Technology on Thermo-structural Composite Materials Laboratory [6142911020207]
To improve the long-term anti-oxidation performance of carbon/carbon (C/C) composites at high temperature, La2O3-modified ZrB2-SiC (ZSL) coating was prepared on SiC-coated C/C composites by pack cementation. The results indicated that significant improvement was achieved on the oxidation resistance of ZSL coated specimens compared with ZrB2-SiC (ZS) coating for SiC-coated C/C composites at 1500 degrees C and 1600 degrees C. The mass loss of the ZSL coated specimen was merely 0.6% after a static oxidation test at 1500 degrees C for 550 h, while that of the ZS coated specimen was 1.89% at the same condition. And the ZSL coating can also protect C/C composites from oxidation for 107 hat 1600 degrees C with the mass loss of 0.92%. Moreover, the mass gain of ZSL coated specimen was 0.35% when it subjected to the thermal shock between 1500 degrees C and room temperature for 50 times. The excellent protection ability against oxidation and thermal shock could be attributed to the synergetic effects of generated La-Si-O compound glassy layer and thermally stable phase ZrSiO4. (C) 2018 Elsevier B.V. All rights reserved.
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