Effect of Mo Addition on the Sinterability and Mechanical Properties of TiB$_2$-Fe Cermets

TiB$_2$-Fe 서메트의 소결성 및 기계적성질에 미치는 Mo첨가의 영향

  • 최덕순 (영남대학교 공업기술연구소)
  • Published : 1999.05.01

Abstract

Fe and Fe-Mo binder were used to produce TiB2 based cermet by a pressureless sintering. The densification behaviour of TiB2-Fe-Mo cermet during liquid-phase sintering in argon was studied in relation to binder phase charactertics. The effects of Mo addition and sintering condition on the sintering behaviour and mechanical properties were also investigated. TiB2-based cermets with Fe-Mo binder composition showed a better sinterability than the cermets with only Fe binder. In TiB2-Fe-Mo cermet higher densities in the wide temperature range were obtained and also fully densified sintered cermet were obtained at 1873K The enhancement in the densification phenomenon of TiB2-Fe-Mo system can be explained by improved liquid phase wettability associated with the roles of Mo components as solute atoms. When Fe-Mo binders were used cermets with a finer grain size and enhanced mechanical properties wereproduced and new phases such as Fe2B and Mo2FeB2 were observed in the sintered cermet. The highest bending strength was obtained from the 20vol% Fe-Mo cermet and these hardness-fracture toughness combination in the wide binder compositions is better than that of TiB2-Fe cermet. In order to improve mechanical properties microstructure control with high purity powders is desirable because high purity powders prevent the formation of Fe2B and Mo2FeB2 phase which comsume the ductile binder phase.

Keywords

References

  1. Journal of the Korean Ceramic Society v.29 no.6 Microstructures and LPG Sensing Properties of Maghemite(γ-Fe₂O₃) Ceramics Hyung-Sup Shin;Jae-Hee Oh
  2. Thin solid Films v.200 Characteristics of α-Fe₂O₃ Thick-film Gas Sensor W. Y. Chung
  3. J. Physique Coll. v.6 no.41 M. Levy(at el.)
  4. Sensors and Actuators v.8 T. A. Tones;J. G. Firth;B. Mann
  5. Proc. Int. Meet. on Chemical Sensors v.171 Characteristics of TiO₂Oxygen Sensor in Nonequilibrium Gas Mixtures K. Saji(at el.)
  6. Sensors and Actuators B v.3 Selectivity in Semiconductor Gas Sensors S. R. Morrison
  7. Proc. 2nd Int. Meet. on Chemical Sensors Stabilization of SnO₂Gas Sensors Sensitivity T. Seiyama(at el.)
  8. Sensors and Actuators v.5 The Tin Oxide Gas Sensors and Its Applications J. Waston
  9. Journal of the Korean Ceramic Society v.27 no.8 Dependency of SnO₂System Carbon Monoxide Gas Sensor on the Atmospheric Temperature & Humidity Hyung-Jin Jung(at el.)
  10. J. Chem. Soc., Faraday Trans. I. v.83 Tin oxide gas sensor-Part I. Aspects of the Surface Chemistry Revealed by Electrical Conductance variation J.F. McAleer(at el.)
  11. Sensors and Actuators B v.4 Schottky-barrier and Conductivity Gas Sensors Based upon Pd/SnO₂and Pt/TiO₂ K. D. Schierbaun(at el.)
  12. Jpn. J. Applied Physics. v.27 no.10 Electronic Interaction between Metal Additives and Tin Dioxide-based Gas Sensors S. Natsushima(at el.)
  13. Porc. 2nd Int. Meet. on Chem. Sensors v.270 A New CH₄Sensor without Noble Metals Li Peide
  14. Journal of Materials Science v.27 Stabilization of SnO₂Ultrafine Particles by Assitives C. Xu.(at el.)
  15. Electronic research center Gas Sensor and Applications Yeung-Hae Kim