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Nanostructured diamond-TiC composites with high fracture toughness

Journal of Applied Physics, ISSN: 0021-8979, Vol: 113, Issue: 4
2013
  • 19
    Citations
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  • 16
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Metrics Details

  • Citations
    19
    • Citation Indexes
      19
  • Captures
    16

Article Description

We report the preparation of nanostructured diamond-TiC composites with high fracture toughness and high hardness starting from a ball-milled mixture of nano-sized TiSiC and submicron-sized diamond by simultaneously tuning the pressure-temperature conditions. The phase segregation of TiSiC at pressure of 5.5 GPa were investigated by X-ray diffraction and high resolution transmission electron microscopy, we found that the TiSiC could decompose into nanosized TiC and amorphous Ti-Si at 600-700 °C. The subsequent reaction between diamond and Ti-Si led to an amorphous Ti-Si-C matrix in which diamond and TiC crystals are embedded. With a loading force of 98 N, the measured fracture toughness K and Vicker's hardness H of the synthesized composites reach up to 14 MPa m and 45.5 GPa, respectively. Our results demonstrate that the nanocrystalline/amorphous bonding matrix could largely enhance the toughness of the brittle composites. © 2013 American Institute of Physics.

Bibliographic Details

Haikuo Wang; Duanwei He; Chao Xu; Mingjun Tang; Yu Li; Haini Dong; Chuanmin Meng; Zhigang Wang; Wenjun Zhu

AIP Publishing

Physics and Astronomy

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