Fabrication and Microstructure of B₄C Matrix Composites by Hot-Pressing Sinter

Abstract:

The sintering behavior of B₄C can be significantly affected by the additions of Si. The B4C based ceramics are prepared via hot pressing. The mixtures that contained initially 15wt% Si sintered at 1830°C for 0.5h, 98.7% relative density reched. The composition and microstructure of the composites are characterized by means of XRD and SEM. Some reactions occurred during the sintering of the two powders. The products are B4C, SiB6, SiC and B sub>12.97 Si.₀₃ C₂ when B₄C+15wt%Si eutectic composite sintered at 1830°C for 0.5h. The Flexural Strength and Fracture Toughness of composites reached 447.2MP and 4.62 MPa•m sup>1/2 highly be improved respectively.

• Periodical: Advanced Materials Research (Volumes 368-373)
• Pages: 326-329
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.368-373.326
• Online since: October 2011
• Authors: Min Zhang, Wei Ke Zhang, Li Zhen Gao, Yu Jun Zhang
• Keywords: Boron Carbide, Mechanical Property, Microstructure

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