Abstract
Twin disc tests were employed to assess rail grease formulation effect on friction, wear, and retentivity to propose guidelines for grease selection based on key aspects of grease formulation. Two commercial rail greases plus six in-house formulated greases with the same additive package and consistency, but different thickener types and base oil viscosities were evaluated. The results showed that: i) at low nominal lambda ratio, crack propagation and friction coefficient are highly dependent on thickener type - both increase for Calcium and decrease for Lithium; ii) at high nominal lambda ratio, friction and wear are controlled by the base oil viscosity; iii) retentivity is controlled by the base oil viscosity regardless of the nominal specific film thickness or thickener type.
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