Preparation and mechanical properties of unidirectional boron nitride fibre reinforced silica matrix composites

被引：32

作者：

Li, Duan ^{[1
]}

Zhang, Chang-Rui ^{[1
]}

Li, Bin ^{[1
]}

Cao, Feng ^{[1
]}

Wang, Si-Qing ^{[1
]}

机构：

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

来源：

MATERIALS & DESIGN | 2012年 / 34卷

基金：

中国国家自然科学基金;

关键词：

A. Composites: ceramic matrix; E; Mechanical; G. X-ray analysis; PRECURSOR INFILTRATION; PERHYDROPOLYSILAZANE; FABRICATION; RESISTANCE; KINETICS;

D O I：

10.1016/j.matdes.2011.08.040

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The unidirectional BNf/SiO2 composites were prepared via sol-gel method, and the structure, composition and mechanical properties were studied. The results show that the composites consist of BN fibres and alpha-cristobalite matrix probably as well as the interface phases of Si3N4 and B2O3. The composites have a density of 1.70 g cm(-3) and an open porosity of 20.8%. The average flexural strength, elastic modulus and fracture toughness at room temperature are 51.2 MPa, 23.2 GPa and 1.46 MPa M-1/2, respectively. The composites show a very plane fracture surface with practically no pulled-out fibres. The mechanical properties of BNf/SiO2 composites at 300-1000 degrees C are desirable, with the maximum flexural strength and residual ratio being 80.2 MPa and 156.8% at 500 degrees C, respectively, while it is a sharply reduced trend as for SiO2f/SiO2 composites. The high thermal stability of BN fibres and self-healing properties caused by the fused SiO2 and B2O3 enable the composites fine high-temperature mechanical properties. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：401 / 405

页数：5

共 28 条

[11] Preparation of three-dimensional carbon fibre reinforced BN-Si3N4matrix composites by precursor infiltration and pyrolysis [J].