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  • Author or Editor: G. Kalácska x
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The lubricant storing and releasing ability of the thermally sprayed surfaces plays an essential role in the proper operation of the components. In the case of porous sprayed surfaces the lubricant storing and releasing ability depends mainly on porosity and the surface energy (adhesion susceptibility). The adhesion ability can also be expressed indirectly with an index number that is by determining the surface free energy.

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Polytetrafluoroethylene surface was treated by atmospheric DBD plasma for 1 min in ambient conditions. The effect of DBD plasma introduces signifi cant increasing of the surface energy (wettability) within 24 hours after treatment. However, the surface starts recovering to the original state with ageing. The surface elemental composition shows enhancing in oxygen content which suggests presenting the polar functional groups. The surface roughness exhibits a mild reduction within 24 hours after treatment. Whereas, the roughness values start to increase with the function of time.

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