期刊
FUSION ENGINEERING AND DESIGN
卷 90, 期 -, 页码 110-118出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.fusengdes.2014.12.005
关键词
Heat-treatment; SiC/SiC composites; Grain size; Interface; Thermal conductivity
资金
- Chinese National Foundation for Natural Sciences [51332004, 51472201]
- fundamental research funds for the central universities [3102014KYJD011]
- State Key Laboratory of Solidification Processing in NWPU [SKLSP201401]
- Research Fund of Northwestern Polytechnical University [20120204]
- major national scientific instrument and equipment development project [2011YQ12007504]
Effect of heat-treatment on the thermal conductivity of 2D SiC/SiC composites was investigated. Results showed that the thermal conductivity of SiC/SiC (9.8 W/(m K) at room temperature) increased by 194% as increasing the heat-treatment temperature from room temperature to 1700 degrees C. After treated at 1900 degrees C, the thermal conductivity increased 14 times from 9.8 W/(m K) (untreated) to 138.4W/(m K). X-ray diffraction analysis and microstructural observation confirmed grain size of SiC matrix and SiC fiber were increased, meanwhile, with the increase of heat-treatment temperature, the distance between fiber and matrix enlarged from 0.5 mu m (1300 degrees C) to similar to 1.4 mu m (1700 degrees C). The heat-treatment mainly influenced grain size of SiC matrix, the crystallinity of SiC fiber and the bounding status between fibers and matrix, which were very critical to the thermal conductivity of composites. (C) 2014 Elsevier B.V. All rights reserved.
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