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J. Korean Ceram. Soc. > Volume 36(5); 1999 > Article
Journal of the Korean Ceramic Society 1999;36(5): 471.
TiB$_2$-Fe 서메트의 소결성 및 기계적성질에 미치는 Mo첨가의 영향
영남대학교 공업기술연구소
Effect of Mo Addition on the Sinterability and Mechanical Properties of TiB$_2$-Fe Cermets
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.
Key words: TiB$_2$, TiB$_2$-Fe-Mo, Cermet, Densification behaviour, Mechanical property
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