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Tribology is the science of interacting surfaces in relative motion and includes the study of friction, wear, and lubrication. The term is derived from the Greek words "tribos" (to rub) and "logos" (study of). Typical tribological measurements include the determination of a coefficient of friction depending on the relative speed of two surfaces.
Determination of a coefficient of friction depending on the relative speed of two surfaces.
The results of tribological experiments are often displayed in the form of a so-called Stribeck curve where the measured coefficient of friction is plotted as a function of sliding speed (the relative motion of the two investigated surfaces). The interaction (friction) of the two surfaces can be measured directly, or indirectly via the dependence of a friction-changing (lubricating) substance. A simplified version of a Stribeck curve for a test including both components, interacting surfaces, and a lubricating substance is shown in this schematic:
Stribeck curve.
Tribology and rheology (the science of flow and deformation of matter) are closely linked and play an important role in many industries such as automotive, construction, food, and personal care. Using the extended possibilities of a modern rotational rheometer to carry out tribological measurements with suitable measuring geometries in addition to conventional rheological tests can therefore be a great advantage. Thermo Scientific HAAKE MARS Rheometers can be equipped with different tribo-rheometry geometries for various applications.
A comprehensive portfolio of tribo-rheometry measuring geometries is available for the Thermo Scientific HAAKE MARS 40 / 60 and the Thermo Scientific HAAKE MARS iQ Rheometer series.
For temperature-dependent measurements, the tribo-rheometry measuring geometries can be used with any standard temperature control module for parallel plates and cone & plate measuring geometries. An optionally available sample cover or an active upper-temperature control module may also be used. In addition, it is also possible to carry out tribological tests in a closed temperature chamber, which ensures a homogeneous temperature distribution over a wide temperature range.
The different tribo-rheometry measuring geometries consist of an upper rotor with quick coupling, automatic recognition (“Connect Assist”), and a flexible spring element that guarantees self-alignment, as well as a lower attachment into which a lubricating substance can be filled. The rotor and the lower attachment are modular so that various combinations of different contact surfaces are possible.
Advantages of the tribo-rheometry configurations with the HAAKE MARS Rheometers:
The Thermo Scientific HAAKE RheoWin Rheometer control and data evaluation software with the optional “Tribo-rheometry” Software Module provides myriad useful features and outputs:
Specific tribological quantities such as friction coefficient, friction force, sliding speed, and others
Stribeck curve produced by HAAKE RheoWin Software.
For Research Use Only. Not for use in diagnostic procedures.