研究目的
Investigating the influence of laser-induced periodic surface structures (LIPSS) produced by femtosecond laser on the friction behavior of silicon sliding on polytetrafluoroethylene (PTFE) in unlubricated conditions.
研究成果
1. Tests performed on polished Si specimens show that the friction coefficient decreases steadily with testing time for 5 mN, with an average value of 0.5, and it increases slightly with testing time for 25 mN, with an average value of 0.3. 2. Tests performed with similar parameters in textured specimens showed that LIPSS changed significantly the tribological behavior of this system. Overall, the friction coefficient decreased with testing time in both sliding directions, more significantly for higher applied loads. 3. Texturing increased the surface roughness, favoring plastic instead of elastic contacts, increasing the ploughing component of friction and shifting the predominant wear regime of PTFE from sliding to abrasive wear.
研究不足
The study is limited to unlubricated conditions and specific loads (5, 10, and 25 mN). The influence of environmental conditions such as temperature and humidity was not extensively explored.
1：Experimental Design and Method Selection:
Tribological tests were performed on polished and textured silicon samples using a ball-on-flat nanotribometer to evaluate the friction coefficient parallel and perpendicularly to the LIPSS orientation.
2：Sample Selection and Data Sources:
<111> single crystal wafers of p-doped silicon were used, cleaned in an ultrasonic bath with acetone followed by isopropanol.
3：List of Experimental Equipment and Materials:
A Yb:KYW chirped-pulse regenerative amplification laser system was used for surface texturing. Tribological tests were performed using a CSM Instruments NTR1 nanotribometer and 3 mm diameter PTFE balls.
4：Experimental Procedures and Operational Workflow:
Surface texturing was performed by the direct writing technique. Tribological tests were performed at 5, 10, and 25 mN applied loads, with 1 cm/s maximum sliding velocity and
5：5 mm half amplitude. Data Analysis Methods:
The evolution of the wear scars surface morphology was studied by scanning electron microscopy (SEM). Cross-sections of the specimens were examined by SEM. Semi-quantitative element analysis of the wear surfaces was performed by energy-dispersive X-ray spectroscopy (EDS).
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