The Korean Journal of Ceramics

The Korean Ceramic Society (한국세라믹학회)
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Mechanical Properties and Electrical Discharge Machinability of $\beta$-Silon-TiB2 Composites

  • Park, Yong-Kap (Division of Metallurgical & Materials Engineering, Sunmoon University) ;
  • Kim, Jun-Tae (Division of Metallurgical & Materials Engineering, Sunmoon University) ;
  • Baik, Yong-Hyuck (Department of Ceramic Engineering, Chonnam National University)
  • Published : 1999.03.01
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Abstract

The influences of TiB2 additions to the β-sialon on mechanical propeties and electrical discharge machinability were investigated. Samples were prepared by adding 15, 30 and 45 vol.% TiB2 particles as a second phase to a β-sialon matrix. The β-sialon-TiB2 composites were sintered by hot pressing in a nitrogen atmosphere at 1800℃ with pressure of 30 MPa. The fracture toughness of the composites was increased with TiB2 content except 45 vol.% TiB2 composite. The crack propagation and crack deflection were observed with a SEM for etched samples after vicker's indentation. The composites containing more than 30 vol.% TiB3 had resistivity lower than 10-3 Ω㎝. The electrical discharge machining (EDM) of composited was conducted with two kind of machines such as die-sinker and wire cutter. The machinability was evaluated with the cutting rate surface roughness after machining.

Keywords

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