Advanced Tribological Characterization of Limiting Friction of Greases

Selection of lubricants for a particular application depends upon various factors ranging from the contact pressure, motion/speed profiles, temperature, etc. This process is quite crucial for the overall performance of a machine or component. With ever increasing demand for improvement in the efficiency of systems, selection criteria have also become quite strict. The tests were carried out on an MCR Tribometer from Anton Paar.

Introduction

Selection of lubricants for a particular application depends upon various factors ranging from the contact pressure, motion/speed profiles, temperature, etc. This process is quite crucial for the overall performance of a machine or component. With ever increasing demand for improvement in the efficiency of systems, selection criteria have also become quite strict.

One of the critical characteristics of a lubricant is its potential to form hydrodynamic film which separates the mating surfaces from each other and protect them from wear. These films only form above a certain speed, which is characteristic to each individual tribological system), determined through their Stribeck curves. However, many applications do not run at constant speeds. Their speed profiles are often dynamic and also involve start-stop events, which are often detrimental to the system. Therefore, the forces and energies required to overcome static frictional resistance of the system and set it into macroscopic motion are quite critical.

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