期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 40, 期 15, 页码 5067-5075出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.06.043
关键词
Ceramic-Matrix Composites (CMCs); Ultra-High-Temperature-Ceramics (UHTCs); Fibre-matrix interface; Rare earths; Oxidation resistance
资金
- European Union [685594]
The influence of Y2O3 addition on the microstructure, thermo-mechanical properties and oxidation resistance of carbon fibre reinforced ZrB2/SiC composites was investigated. Y2O3 reacted with oxide impurities present on the surface of ZrB2 and SiC grains and formed a liquid phase, effectively lowering the sintering temperature and allowing to reach full density at 1900 degrees C. The presence of a carbon source (fibres) led to additional reactions which resulted in the formation of new secondary phases such as yttrium boro-carbides. Mechanical properties were significantly enhanced compared to the un-doped composite. Further tests at high temperatures resulted in strength increase up to 700 MPa at 1500 degrees C which was attributed to stress relaxation. Oxidation tests carried out at 1500 degrees C and 1650 degrees C in air showed that the presence of the Y-based secondary phases enhanced the growth of ZrO2 grains, but offered limited protection to oxygen due to the lower availability of surficial SiO2 formed from SiC.
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