Microstructure and mechanical properties of h-BN–SiC ceramic composites prepared by in situ combustion synthesis

► h-BN–SiC ceramic composites were fabricated by one-step SHS under high nitrogen pressure. ► Si3N4 is the preferential formation phase under high nitrogen pressure of 120MPa. ► h-BN–SiC ceramic composites have good bond strength and mechanical properties. h-BN–SiC ceramic composites were prepared b...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2012-04, Vol.540, p.102-106
Main Authors: Zheng, Y.T., Li, H.B., Zhou, T.
Format: Article
Language:English
Subjects:
Ceramic composites
Ceramics
Combustion synthesis
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Density
Exact sciences and technology
Fatigue, brittleness, fracture, and cracks
h-BN–SiC
In situ SHS
Materials science
Materials synthesis
materials processing
Mechanical and acoustical properties of condensed matter
Mechanical properties
Mechanical properties of solids
Microstructure
Particulate composites
Physics
Silicon carbide
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Summary:► h-BN–SiC ceramic composites were fabricated by one-step SHS under high nitrogen pressure. ► Si3N4 is the preferential formation phase under high nitrogen pressure of 120MPa. ► h-BN–SiC ceramic composites have good bond strength and mechanical properties. h-BN–SiC ceramic composites were prepared by in situ combustion synthesis of B4C and Si powder compacts under high nitrogen pressure. The high reaction nitrogen pressure was beneficial to the improvement of the relative density and mechanical properties of the products, but higher nitrogen pressure of 120MPa was favorable to the formation of Si3N4, which was consistent with the theoretical thermodynamic calculation. The h-BN–SiC ceramic composites have good mechanical properties over those of conventionally processed ones because of the in situ formed h-BN and SiC phases fabricated under high temperature and pressure. The bending strength and fracture toughness of the h-BN–SiC ceramic composites prepared under 100MPa nitrogen pressure were 82MPa and 1.9MPam1/2, respectively.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2012.01.105