Measurement examples of lubricants using tribology options: rheometer
This is an introduction to a case study of lubricant analysis by a specialist in analysis. This time, we will clarify the shear rate and temperature dependence of frictional behavior using a rheometer.
Measurement capabilities offered by TA Instruments ☆ Thermal analysis / glass transition, crystallization, thermogravimetric analysis, curing reactions, expansion rate, thermal conductivity, shrinkage rate, effects of moisture, etc. ☆ Viscoelastic measurements (rheology, rheometers) / viscoelasticity, elastic modulus, viscosity, stress relaxation, creep, master curves, residual strain, molecular weight, molecular weight distribution, etc. ☆ Microcalorimetry / intermolecular interactions, crystallization, amorphousness, aggregation/precipitation, dispersibility, solubility, compatibility, wettability, stability, adsorption, etc. ☆ Fatigue testing / tensile strength, temperature dependence, viscoelasticity, elastic modulus, viscosity, stress relaxation, creep, master curves, residual strain, etc.
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This time, TA Instruments introduces a viscoelastic measurement device called the "Rheometer; DHR." In this article, we prepared two types of lubricants and evaluated the friction coefficient measurements of each lubricant, as well as their dependence on shear rate and temperature. ◆ Evaluation of the change behavior of the friction coefficient of lubricants at room temperature The friction measurement accessory of our rheometer (DHR) consists of four metal balls, allowing for stable friction coefficient measurements. We evaluated two types of lubricants and compared their friction coefficients. ◆ Joint evaluation of friction coefficient changes under high temperature and high shear rate The previous measurements were conducted at room temperature, but when used in the field, it is necessary to consider conditions such as high temperatures and high shear rates. This time, we evaluated how the friction of the lubricants changes under conditions of 180°C and 0.1 to 100 mm/s, and which lubricant is more useful as a lubricant, referencing the Stribeck curve.
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