A study of MoSi2-MoS2 coatings fabricated by SHS casting route

Coatings were fabricated on a steel substrate by a self-propagating high te mperature synthesis (SHS) casting route. The processing is described in det ail. The phases in the coating were examined using X-ray diffraction (XRD). The microstructures of the coatings were analyzed with optical microscopy (OM), scanning electron microscopy (SEM) and electron probe microanalyzer ( EPMA). Tribological properties and microhardness of the coatings with 6-12 wt.% MoS2 were measured. The experimental results show that the coatings we re composed of MoSi2 and MoS2 phases and coatings with 6-12 wt.% MoS2 had d ense microstructure. Metallurgical bonding had formed between the coatings and the substrate. Friction of the coatings with 6-12 wt.% MoS2 is lower th an its steel substrate. Microhardness and wear resistance of the coatings w ith 6-12 wt.% MoS2 are higher than that of the steel substrate. Near the in terface microhardness of the coating varies with the distance to the interf ace. (C) 2000 Elsevier Science S.A. All rights reserved.