Dip-coating of boron nitride interphase and its effects on mechanical properties of SiCf/SiC composites

被引：37
|
作者：
Ding, Donghai [1 ]
Zhou, Wancheng [1 ]
Luo, Fa [1 ]
Chen, Malin [1 ]
Zhu, Dongmei [1 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2012年 / 543卷
关键词：
Mechanical characterization; X-ray diffraction; Ceramics; Composites; SIC-MATRIX COMPOSITES; CARBON-FIBERS; CARBOTHERMAL SYNTHESIS; OXIDATION MECHANISMS; TEMPERATURES; DEGRADATION; DEPOSITION; KINETICS; DESIGN;
D O I：
10.1016/j.msea.2012.01.118
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Boron nitride (BN) coatings were successfully synthesized on KD-1 SiC fibers by dip-coating in boric acid and urea solution followed by heat treatment at 1000 degrees C in nitrogen. The SEM micrographs indicated that the BN coating is smooth. The XRD and Raman spectrum results showed that the composition of the coatings is h-BN. The effects of BN interphase on the mechanical properties of 2.5D SiC fiber reinforced CVI-SiC matrix (SiC/SiC) composites were investigated. The results show that the flexural strength of SiCf/SiC composites with and without BN interphase is 170 MPa and 60 MPa, respectively. And, compared to composites without interphase, the SiCf/SiC composites with BN interphase exhibit an obvious toughened fracture behavior. It is indicated that dip-coating BN interphase can effectively adjust the interfacial bonding strength and improve the mechanical properties of SiCf/SiC composites. (C) 2012 Published by Elsevier B.V.
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页码：1 / 5
页数：5
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