Abstract
In this work, the wear performance of nano- and ordinary MoSi2 plasma-sprayed coating on Ni substrate are compared. MoSi2 nanopowder is prepared by ball milling followed by heat treatment processes. Atmospheric plasma spraying with argon atmosphere protection has been used to deposit the powders onto the nickel substrate. Ni substrate, MoSi2 coating, and nano-MoSi2 coating were subjected to reciprocating wear test. Wear tests were done on a pin on plate machine by sliding MoSi2 coating and substrates without coating against 52100 steel as the pin, at a temperature of 27 °C in dry condition. A friction coefficient of 0.18 ± 0.1 is obtained for nanostructured MoSi2 coating, whereas a friction coefficient of 0.2 ± 0.1 is obtained for conventional MoSi2 coating under normal load of 20 N. Wear performance of nanostructured MoSi2 coating was better as compared to the conventional MoSi2 coating. The three observed dominant types of wear mechanisms were adhesive, oxidation and abrasive. Morphologies and phases of coating, wear tracks, wear debris and counterpart steel pins were evaluated by SEM with EDS and X-ray diffraction. The microhardness and adhesion strength of nanostructured MoSi2 coating are determined by 1000 HV and 27 MPa, respectively.
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