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nm to 93.7 μm. This compares to a limited load (~ 12 mN) and displacement (~ 4.5 μm) ranges for conventional nanoindentation transducers, but consequently, its theoretical load (376 nN) and displacement resolutions (0.01 nm) are supposed to be lower than those of conventional transducer (1 nN and 0.006 nm). Additionally, its practical resolution values might be even lower due to vibration and thermal noise. Loading operates on the principle that when a voltage is applied to a pre-stressed piezoelectric material, it lengthens and pushes the indentation probe into the sample. The movement of the probe end-tip is carefully monitored and adjusted through a high-frequency digital feedback loop which collects information from the Z-axis load cell (load-controlled indentation). A Berkovich tip (three-sided pyramid) with a measured radius of curvature of 170 nm (Figure 4.3) was used in this work due to its suitability for bulk materials and relatively thick coatings. Figure 4.3 (a) SEM image of Berkovich tip used in the high-load indentation measurements and (b) zoom-in of tip end showing a nominal radius of curvature of about 170 nm. A critical component of indentation measurements is the calibration of the tip, known as area function. It uses compliance method, also known as the Oliver-Pharr 54PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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