Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 559, Issue -, Pages 510-514Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2012.08.133
Keywords
LPS additives; SiC ceramics; ZrSiO4; Mullite crystal whickers
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Funding
- Chinese Academy of Sciences
- National Natural Science Foundation of China [51071167, 51102266]
- Chinese Academy of Sciences [YZ200939]
- Shanghai Yangtze River Delta Science Project [11495810100]
- Shanghai Pujiang Program [10PJ1410700]
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Mullite-zircon (Al2O3-SiO2-ZrSiO4), as a new liquid-phase sintering (LPS) additives system, was introduced into the silicon carbide (SiC) ceramics in order to improve the mechanical and thermal shock properties. The reaction mechanism of the SiC ceramics with additive system during the sintering process was analyzed by thermodynamic calculation and the mullite-zircon system was detected as expected in the final specimens. The ZrSiO4 phase was generated from the reactions of ZrB2 and SiO2 in air and distributed homogeneously in the SiC matrix. The mullite phase in the form of crystal whisker was completely crystallized at 1350 degrees C, and the size of the crystallite increased with the increase of the sintering temperature from 1350 degrees C to 1400 degrees C. This process was explained by vapor-liquid-solid (VLS) mechanism. The influences of sintering temperature and the content of ZrB2 content on their properties and the reaction mechanism were studied. It was found that the specimens were compact when sintered at 1400 degrees C, and the content of ZrB2 played an important role in the densification process. (C) 2012 Elsevier B.V. All rights reserved.
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