Study of the System Mo-Fe-B for Wear-Resistant Materials
Borides, especially transition metal borides, like Mo2FeB2 ternary boride, are promising candidates for wear resistance applications. However, poor sinterability and extreme brittleness raise difficulties to manufacture a structural material. In this work, the viability to obtain Fe-Mo-B alloys with high wear resistance materials obtained by PM techniques is studied. Other researchers use Cr and Ni alloyed steels and the B amount addition is very low. The main objectives are to increase the amount of B, not to use Cr alloyed steels and to decrease the sintering temperature. This can be obtained using mechanically alloyed Fe/B (50% by wt.) powders, which are highly reactive after milling for 36 h. The mixture has a composition of 40%Mo-40%Fe-20%Fe/B, being characterized by flow rate and apparent density. These materials were uniaxially compacted and vacuum sintered. Specimens were analysed by SEM and physical and mechanical properties were evaluated (density, dimensional change, bending strength, hardness and wear).
Lucio Salgado and Francisco Ambrozio Filho
J. Abenojar et al., "Study of the System Mo-Fe-B for Wear-Resistant Materials", Materials Science Forum, Vols. 591-593, pp. 265-270, 2008