Abstract
To achieve a stable and high wear resistive functional surface under dry sliding friction, the present study proposes micro-textured diamond-like carbon coatings fabricated by ionized physical vapor deposition (I-PVD) using metallic masks. To clarify the suitable geometrical design under dry sliding friction, geometrical quantities of textured array patterns are varied by using metallic masks with different circular hole array patterns fabricated by picosecond pulsed laser processing. The effect of texturing on friction and wear properties is evaluated by ball-on-disk type friction tests for the condition of a constant DLC-coverage per unit area. Thereby, textured DLC pattern with diameters of 50 μm, 100 μm, and 150 μm are applied. Within the first 10 000 laps stable and lower coefficient of friction is obtained with the smallest diameters of 50 μm. However, at further rotation of more than 40 000 laps, the wear of the smaller diameters becomes more pronounced due to the increase of stress concentration at the edge of the structure. Based on these findings, geometrical design of micro-textured DLC coating is discussed with regard to the suppression of three-body plowing and the prevention of stress concentration.
Highlights
With the growing awareness of environmental issues, the efforts toward a lubricant-free metal forming are intensifying [1]
The first step in this work was the manufacture of the metallic masks following the design required for the subsequent diamond like carbon (DLC)-deposition
With the micro-perforated metallic masks, a microtexturing of thin DLC films was realized during the deposition process
Summary
With the growing awareness of environmental issues, the efforts toward a lubricant-free metal forming are intensifying [1]. Thereby, it was noticed that it is essential to consider the ejection of wear particles from the contact interface as a key factor in the design of suitable surface texturing This was traced back to the crucial effect of wear debris generation and its entrapment at the interface. The influence of the texture dimensions under dry sliding friction on the tribological properties has not been discussed in detail for the representative contact state in metal forming.
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