期刊
MATERIALS LETTERS
卷 111, 期 -, 页码 169-172出版社
ELSEVIER
DOI: 10.1016/j.matlet.2013.08.082
关键词
SiCN; CVI; Mechanical property; Electromagnetic property
资金
- Natural Science Foundation of China [51332004, 50972119, 51002120]
- 111 Project [B08040]
- state key laboratory of solidification processing in NPU [KB200920]
A novel SiCN ternary phase was introduced into porous Si3N4 preform by chemical vapor infiltration from SiCl4-C3H6-NH3-H-2-Ar, which was used to fabricate Si3N4-SiCN composite ceramics. SiCN was composed of amorphous Si3N4 matrix and crystalline SiC nano-particles (with a homogeneous size of similar to 5 nm) uniformly distributed in amorphous matrix. This distinctive microstructure made the Si3N4-SiCN ceramics not only maintain a high flexural strength of 227 MPa but realize a low dielectric constant and a high dielectric loss, which led to a minimal electromagnetic wave reflection coefficient of -42.6 dB, ranking the best level in the already-reported structural and wave-absorbing ceramic materials for high-temperature applications. (C) 2013 Elsevier B.V. All rights reserved.
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