Mechanical and microwave dielectric properties of SiCf/SiC composites with BN interphase prepared by dip-coating process

被引：114

作者：

Liu, Haitao ^{[1
,2
]}

Tian, Hao ^{[1
]}

机构：

[1] Natl Univ Def Technol, Coll Aerosp & Mat Engn, Key Lab Adv Ceram Fiber & Composites, Changsha 410073, Hunan, Peoples R China

[2] Natl Univ Def Technol, Coll Aerosp & Mat Engn, Sci & Technol Scramjet Lab, Changsha 410073, Hunan, Peoples R China

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2012年 / 32卷 / 10期

关键词：

Precursors-organic; Composites; Mechanical properties; Dielectric properties; SiC; Functional applications; SIC MATRIX COMPOSITES; CARBON-FIBERS; CONDUCTIVITY; FILMS;

D O I：

10.1016/j.jeurceramsoc.2012.02.009

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The BN interphase of SiC fiber-reinforced SiC matrix (SiCf/SiC) composites was fabricated by dip-coating process with boric acid and urea as precursor. The results show that the tensile strength of SiC fiber decreases about 30% after BN coating treatment, but the BN coating has little influence on the electrical resistivity of SiC fiber. Compared with the as-received SiCf/SiC composites, the SiCf/SiC composites with BN interphase exhibit a toughened fracture behavior, and the flexural strength is about 2 times that of the as-received SiCf/SiC composites. From the microstructural analysis, it can be confirmed that the BN interphase plays a key part in weakening interfacial bonding, which can improve the mechanical properties of SiCf/SiC composites remarkably. Owing to the close dielectric properties between SiC and BN, the complex permittivity of SiCf/SiC composites with and without the BN interphase is similar. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：2505 / 2512

页数：8

共 30 条

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