Analysis of the hardness ratio effect on the tribological performance of NiCrBSi coating/debris particles using the Stribeck Curve

This work aims to propose an approach estimate the final surface roughness as a function of hardness ratio between coating and debris (Hpin/Hdebris = Hp/Hd) under lubricated conditions employing pin-on-disc configuration. Using this provides better understanding prediction lubrication regime (Stribeck Curve) compared with traditional that uses initial roughness. Our results demonstrate lower induces higher friction coefficient contributes marked increase in wear rate conditions. To find effective method for simulating effect, four types NiCrBSi powders were used source debris: two metallic completely spherical morphology but different Cr concentrations other (15.25%Cr) mixed 40 60% ceramic, Zr + 7% Y2O3 (ZSP), composed particles morphology. Therefore, set sources material specimens simulated by similar size distribution average hardness. Each these was dispersed oil lubricant. Observation worn surfaces using rugosimeter scanning electron microscope suggested that, together shape, number debris, must be considered when studying tribological behavior machine components. The proposed methodology may help predict variation parameters curve) controlling ratio.