Properties of Electrical Discharge Machinable $SiC-TiB_2$ Composites

  • Kim, Young-Wook (Division of Ceramics, Korea Institute of Science and Technology, Seoul) ;
  • Park, Heon-Jin (Division of Ceramics, Korea Institute of Science and Technology) ;
  • Lee, June-Gunn (Division of Ceramics, Korea Institute of Science and Technology) ;
  • Lee, Soo W. (Dept. of Mater. Eng., Sun-Moon Univ) ;
  • Chung, Soon-Kil (World-Peace Institute of Technology)
  • Published : 1995.09.01

Abstract

Electrical discharge machinable $SiC-TiB_2$ composites were fabricated by hot-pressing. Their mechanical and electrical properties were determined as a function of $TiB_2$ content. The addition of $TiB_2$ to SiC matrix increased the strength and toughness and decreased electrical resistivity. The flexural strength and fracture toughness of SiC-40 vol% $TiB_2$ composited were approximately 50% higher than those of monolithic SiC ceramics. Microstructural analysis showed that the toughening was mainly due to the crack deflection, with some possible contribution from crack branching or microcracking.

Keywords

References

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