Measurement examples of lubricants using tribology options: rheometer

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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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Applications/Examples of results

<Rheometer> ■ Nano Torque Motor Control ■ Excellent stress, strain, and strain rate control ■ Direct strain vibration ■ Thrust dual radial bearing design ■ Ultra-low compliance integrated molded housing ■ Heat-resistant and vibration-proof electronics design ■ Smart Swap geometry (patented) ■ Original Smart Swap temperature control system ■ Active temperature control (patented)