Reciprocating Wear of Sintered Fe-Cr-Mo-V-W-C-MoS<sub>2</sub> Composites

In this work, the Fe-Cr-Mo-V-W-C-MoS 2 composites were fabricated using the powder metallurgy process. The uniaxial cold compaction was used to produce green specimens with the density of 6.3 g/cm 3 . Subsequently, the specimens were sintered at temperatures of 1150 and 1200 °C for 45 min in a vacuum furnace. Sintered specimens were cooled down in the furnace with N 2 at a cooling rate of 0.1 °C/s. The influence of MoS 2 addition on the density, hardness and microstructure were investigated. Density and hardness of composites were improved due to MoS 2 addition, especially, 5 wt.% MoS 2 addition and sintering at 1200 °C. The dissociation of MoS 2 contributed to the formation of sulfide phases and hard carbide particles within the composites. Sulfide phases such as FeS, CrS and other sulfides were detected by x-ray diffraction analysis. The reciprocating wear test was used to study the effect of MoS 2 addition on friction and wear resistance of composites. The synergy of FeS and CrS contained in the compacted layer and hard carbide particle formation within the matrix were expected to enhance tribological properties of composites by decreasing friction coefficient and improving wear resistance.