The Korean Journal of Ceramics

The Korean Ceramic Society (한국세라믹학회)
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Effects of the Addition of $La_2O_3$ on Mechanical Properties and Machinability of $Si_3N_4$ Ball

  • Sang Yang Lee (Department of Material Science and Engineering, Sunmoon University) ;
  • Sung Ho Kim (Department of Material Science and Engineering, Sunmoon University) ;
  • Soo Wohn Lee (Department of Material Science and Engineering, Sunmoon University)
  • Published : 2000.12.01
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Abstract

Silicon nitride with adding La$_2$O$_3$ was sintered by gas pressure sintering (GPS) technique at $1950^{\circ}C$, in $N_2$ gas at 3 MPa, for 2h. Mechanical properties such as hardness, flexural strength, and fracture toughness were determined as a function of the GPS holding time and the contents of La$_2$O$_3$ in silicon nitride. Also machinability of silicon nitride ball with various GPS holding time and amount of La$_2$O$_3$ was evaluated by magnetic fluid grinding (MFG) method. In this study it was found that machinability was influenced significantly with La$_2$O$_3$ contents. However, the different GPS holding time did not affect the machinability very much.

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