Tribological properties of molybdenum coatings sprayed by electro-thermal explosion directional spraying

The microstructure and the mechanical properties of the electro-thermal explosion directionally sprayed molybdenum coatings were determined by means of SEM, XRD and microhardness tester, respectively. Experiments on the tribological property of the coatings were performed using a ring-on-block type wear tester. Results showed that the molybdenum coatings were characterized by compact microstructure, high bonding strength and high wear resistance. The applied loads and the counterpart's hardness have an obvious influence on the tribological properties of the coatings. Several wear failure modes, such as micro-plowing and pits, were identified in the post-testing analysis.