Effect of graphene coating and surface texture on friction properties of single crystal silicon
In order to enhance the friction and wear resistance of single-crystal silicon,a surface texturing process was employed using ultraviolet laser machining.Various surface textures were etched onto the single-crystal silicon,followed by the deposition of graphene and graphene oxide coatings.The frictional properties of the single-crystal silicon under dry friction conditions were investigated using an MRTR-1 friction and wear tes-ting machine.Microscopic morphology and wear tracks of the single-crystal silicon samples were observed using optical microscopy and scanning electron microscopy(SEM).The mass of the samples was measured using an e-lectronic balance before and after the experiments to calculate the wear rate.The results indicate that surface-textured samples exhibited a reduction in wear rate to varying degrees,with wear rates decreasing from 0.012 to below 0.008 compared to untextured samples.Some of the surface-textured samples were able to lower the fric-tion coefficient to values below 0.14.The primary wear mechanisms of the single-crystal silicon samples were abrasive wear and adhesive wear.The combination of surface texturing,which acts to collect wear debris and store coating fragments,along with the unique physical properties of graphene-based coatings,effectively im-proved the frictional performance of single-crystal silicon,significantly reducing wear rates and protecting the material.
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