Study of friction coefficients for a few couples of materials.

What is it about?

In this paper, well-defined surface textures were produced by photolithography and anisotropic etching in KOH of silicon wafer [5]. Static and kinetic friction coefficients determining tests for the textured silicon/steel, aluminium, copper, FR4 and PVC were performed using Imada apparatus equipped with a device developed specifically. To validate the experimental results, a simulation with 20-sim software has been made. The influence of surface roughness on the static friction coefficient has been studied, also.

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Why is it important?

The obtained results are presented in Table 1 and Figure 4 – Figure 6. One can be seen that the value of the friction coefficients depend on surface material and topography, processing method and in some cases on pressure and relative speed, as well as on environmental and operational factors. The tests were performed at 25°C, and the specific pressure varied between 0.99 to 5.17 N/cm2 (on all three chips). The kinetic friction coefficient diminishes at higher loads, being nearly independent of them and even of material. This behavior could be explained by the textures of silicon, which is also the hardest material and with the smallest roughness (corresponding to polishing) among those considered.

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