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Preparation and mechanical properties of unidirectional boron nitride fibre reinforced silica matrix composites
Highlights ► BN fibres hardly degrade when exposed at elevated temperatures. ► Few researches have related to BNf/SiO2 composites. ► BNf/SiO2 composites have fine high-temperature mechanical properties. ► Self-healing properties of fused SiO2 and B2O3 may contribute to the properties.
Abstract 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 α-cristobalite matrix probably as well as the interface phases of Si3N4 and B2O3. The composites have a density of 1.70gcm−3 and an open porosity of 20.8%. The average flexural strength, elastic modulus and fracture toughness at room temperature are 51.2MPa, 23.2GPa and 1.46MPam1/2, 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°C are desirable, with the maximum flexural strength and residual ratio being 80.2MPa and 156.8% at 500°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.
Preparation and mechanical properties of unidirectional boron nitride fibre reinforced silica matrix composites
Highlights ► BN fibres hardly degrade when exposed at elevated temperatures. ► Few researches have related to BNf/SiO2 composites. ► BNf/SiO2 composites have fine high-temperature mechanical properties. ► Self-healing properties of fused SiO2 and B2O3 may contribute to the properties.
Abstract 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 α-cristobalite matrix probably as well as the interface phases of Si3N4 and B2O3. The composites have a density of 1.70gcm−3 and an open porosity of 20.8%. The average flexural strength, elastic modulus and fracture toughness at room temperature are 51.2MPa, 23.2GPa and 1.46MPam1/2, 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°C are desirable, with the maximum flexural strength and residual ratio being 80.2MPa and 156.8% at 500°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.
Preparation and mechanical properties of unidirectional boron nitride fibre reinforced silica matrix composites
Li, Duan (author) / Zhang, Chang-Rui (author) / Li, Bin (author) / Cao, Feng (author) / Wang, Si-Qing (author)
2011-08-27
5 pages
Article (Journal)
Electronic Resource
English
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