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like particles, and thus semi-crystalline structure of PEEK/PTFE coating, whereas an amorphous structure of PTFE/Pyrrolidone-2 coating. Therefore, in the case of PEEK/PTFE, depending on where the probe tip indents, either crystal particle or porous area is pushed by the tip, and thus different mechanical properties are measured. However, PTFE/Pyrrolidone-2 results in very constant mechanical properties regardless of the indentation area and the penetration depth. Such uniform and consistent micromechanical properties are expected to also have superior tribological performance (section 4.3.3). PTFE/Pyrrolidone-1 PTFE/Pyrrolidone-2 PTFE/MoS2 Fluorocarbon PEEK/PTFE (b) PTFE/Pyrrolidone-1 PTFE/Pyrrolidone-2 PTFE/MoS2 Fluorocarbon PEEK/PTFE (a) 8 6 4 2 100 80 60 40 20 00 02460246 hc (μm) hc (μm) Figure 4.12 Extracted (a) elastic modulus and (b) hardness values with respect to contact depth. 4.3.2.2 Elastic modulus and hardness Figure 4.12 shows the elastic modulus and hardness values of 5 different coatings as a function of contact depth. Each data point shows an averaged elastic modulus (y- axis) and contact depth (x-axis) along with their standard deviations (error bars in both axes) from six indentation measurements at a given maximum load. In all cases except 70 Er (GPa) H (MPa)PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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