期刊
CERAMICS INTERNATIONAL
卷 40, 期 7, 页码 9009-9016出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2014.01.113
关键词
Mechanical properties; Dielectric properties; SiCf/SiC composites; Precursor infiltration and pyrolysis
资金
- National Natural Science Foundation of China [51202291]
- Aid Program for Innovative Group of National University of Defense Technology
- Aid program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province
SiC fiber-reinforced SiC matrix (SiCf/SiC) composites, which employ a new type of KD-I SiC fibers (provided by the National University of Defense Technology, China) with in situ pyrocarbon (PyC) coating on the surface of the fibers as reinforcements, are fabricated through precursor infiltration and pyrolysis (PEP). The characteristics of the fiber surface are evaluated by scanning electron microscopy, X-ray photoelectron spectroscopy, Auger electron spectroscopy, and transmission electron microscopy. The mechanical and dielectric properties of KD-I SiCf/SiC composites are reported, and the effects of in situ PyC coating on the material properties are investigated. Results show that the KD-I SiC fiber has a special skin (PyC phase)-core (Si-C-O phase) structure. The composites possess excellent mechanical properties because of the in situ PyC coating on the surface of the fibers. The flexural strength and toughness are 268.8 MPa and 12.9 MPa m(I/2), respectively. However, the dielectric constants are also remarkable, which is disadvantageous to microwave absorbing applications. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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