Study Of Micron MoS₂/PTFE On Laser Micro-Drilled Templates By Electrophoretic Deposition

Molybdenum disulfide?MoS₂? has lower friction coefficient and it is considered one of the most classic solid lubricating material. But there are some disadvantages in the traditional MoS₂ coating, such as its brittleness resulting in the loss of itself fast in the lubrication process and leads to the problem of short lubrication life, which limiting its application as solid lubricant. Therefore, it is very important to solve the problem of MoS₂ lubrication coating life.In this paper, blind micro-hole array templates were constructed on Laser cladding layer by laser drilling, electrophoretic deposition and microwave sintering technology were adopted to assemble MoS₂ and MoS₂/PTFE solid lubrication materials and the solid lubrication materials was successfully planted on laser micro template by electrophoretic deposition. The influence of laser parameters on the morphology of the blind holes, the regulation of electrophoretic deposition MoS₂/PTFE, the effect of microwave sintering temperature and holding time, and the tribological properties were studied by using of 3D laser scanner, scanning electron microscope?SEM?, optical microscope, X-ray diffraction?XRD?, and the friction and wear experiment.The results show that the diameter and depth of the micro-holes increase with the increase of laser average power. The diameter of the micro-holes increases slightly with the increase of laser irradiation time, the diameter reaches 110?m when the time reaches 2ms, and the diameter is not change with the time continue to increase. But, the depth increases significantly with the increase of laser irradiation time. The deposition rate decreased and the deposition ultimate thickness decreased with the content of PTFE in the suspension increased. The deposition rate increases and the surface roughness of the coating decrease with the applied electric field descend. The coating thickness increases and the deposition rate decreases gradually with the deposition time increases, 20 min later, the deposition of MoS₂ reached saturation, and the deposition weight was 10.8mg/cm2. MoS₂ oxidation increased with microwave synthesis temperature increases. The coating structure is compact with heat preservation time prolonged. Friction coefficient of lubricant coating increases from 0.2 to 0.7 and wear depth ascendant from 2.101?m/3h to 8.048?m/3h with microwave synthesis temperature rise from 300? to 400?. Friction coefficient of lubricant coating increases from 0.25 to 0.4 and wear depth descend from 3.762?m/3h to 1.269?m/3h with increases of PTFE content in lubricating coating from 5% to 20%. Wear depth increases from 1.306?m/3h to 17.931?m/3h with increase in the density of micro- hole from 10% to 40%. Friction coefficient of lubricant coating increases from 0.2 to 0.1 with increase in the density of micro- hole from 10% to 20%, but density of micro- hole over 20%, Friction coefficient of lubricant coating increases with increases in the density of micro-hole.