In Situ Combustion Synthesis of h-BN-SiC High-Temperature Ceramics

Hong Bo Li; Yong Ting Zheng; Jie Cai Han

doi:10.4028/www.scientific.net/KEM.353-358.1501

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 353-358In Situ Combustion Synthesis of h-BN-SiC...

In Situ Combustion Synthesis of h-BN-SiC High-Temperature Ceramics

Abstract:

The feasibility of fabricating h-BN-SiC high-temperature ceramics by in-situ combustion synthesis was demonstrated by igniting the mixture of boron carbide and silicon powder under 100MPa nitrogen pressure. The reaction thermodynamics and the adiabatic combustion temperature were calculated theoretically. The phase composition, microstructure and mechanical properties of composite were identified by XRD and SEM. The maximum bending strength and fracture toughness of the composite were 65.2 MPa and 1.4 MPa·m1/2 under room temperature, respectively. The effects of h-BN and SiC dilution contents on the mechanical properties of composite were also discussed.

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Periodical:

Key Engineering Materials (Volumes 353-358)

Pages:

1501-1504

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.353-358.1501

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Online since:

September 2007

Authors:

Hong Bo Li, Yong Ting Zheng, Jie Cai Han

Keywords:

Combustion Synthesis (CS), H-BN-SiC, High Temperature Ceramics

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[40] [50] [60] [70] [80] Bending Strength Fracture Toughness Dilution Contens of SiC (wt%) Bending Strength (MPa) 1. 0 1. 5 2. 0 2. 5 Fracture Toughness (MPa. m1/2).

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