Preparation and Properties of TiB₂-SiC-Si Composites Fabricated by Reaction Bonding

Abstract:

TiB₂-SiC-Si composite was fabricated by reaction bonding. The influence of carbon content on the phase compositions, microstructure, density and mechanical properties was studied. The results showed that the composite consists of TiB₂, SiC and Si phases. The vol% of SiC increased with the increase of C contents, while that of TiB₂ and free silicon reduced respectively. The mechanical properties of TiB₂-SiC-Si composites are improved initially and then deteriorated with the increase in C contents of which the optimal amount is 8 %. The optimum open porosity, volume density, Vikers-hardness, flexural strength and fracture toughness of the obtained TiB₂-SiC-Si composite are 0.12 %, 3.73 g/cm³, 17 GPa, 290 MPa and 5.9 MPa·m^1/2, respectively.

• Periodical: Key Engineering Materials (Volume 697)
• Pages: 539-546
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.697.539
• Online since: July 2016
• Authors: Cui Ping Zhang, Hong Qiang Ru*, Ru Peng He, Wei Kang Sun, Jing Hui Zhu, Wei Wang, Xin Yan Yue
• Keywords: Mechanical Properties, Microstructure, Reaction Bonding, TiB₂-SiC-Si Composite, Vacuum Infiltration of Si

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