研究目的
To examine the evolution of tribological properties under dynamic mechanical impact and hot switching conditions using a polycrystalline silicon microtribometer.
研究成果
The study explored the effect of an interfacial voltage on the evolution of tribological properties of dynamically loaded silicon surfaces. Experiments were conducted in ambient air conditions. Adhesion was monitored as a function of dynamic impact cycles. Through the dynamic lifetime, surfaces experienced two distinct degradation regimes – a run-in period with low and stable adhesion and a degradation period with a logarithmic increase in adhesion. Based on the cyclic loading tests, it was concluded that hydrocarbons physisorbed to the surface have a low tendency to polymerize and agglomerate, resulting in no significant accumulated organic wear debris under normal impacting conditions. Furthermore, the high resistivity of silicon and silicon dioxide prevents high electrical currents and the corresponding formation of large scale wear debris from field emission and microwelding.
研究不足
The study was conducted in ambient air at ~ 24 °C and ~ 50% relative humidity, which may not represent all operational environments. The high resistivity of silicon and silicon dioxide prevents high electrical currents and the corresponding formation of large scale wear debris from field emission and microwelding.
1：Experimental Design and Method Selection:
A polycrystalline silicon microtribometer was used to examine the evolution of tribological properties under dynamic mechanical impact and hot switching conditions. Changes in surface properties were tracked via periodic static adhesion tests.
2：Sample Selection and Data Sources:
Surfaces experienced two distinct periods in the course of the dynamic lifetime – a run-in phase with little measurable surface modification and a degradation phase with significant surface modification and corresponding increases in the measured adhesion force.
3：List of Experimental Equipment and Materials:
Polycrystalline silicon microtribometer, scanning electron microscope (SEM), digital microscope (QIOPTIQ, A-Zoom2), tungsten probe tips, multi-probe station (Cascade Microtech, Inc., Summit 12742B-6), function generators (Hewlett Packard, 33120A), power supplies (BK Precision, 9110), vibration isolation table (Kinetic Systems, Inc., Vibraplane).
4：Experimental Procedures and Operational Workflow:
Dynamic impact testing was performed in which shuttles were brought into and out of contact at a frequency of 1000 Hz. During mechanical switching tests, both shuttles were grounded throughout the testing. During hot switching tests, a voltage potential of 2.0 or 4.0 V was applied between the shuttles.
5：0 or 0 V was applied between the shuttles.
Data Analysis Methods:
5. Data Analysis Methods: The development of micro- to nanoscale surface properties was studied using a variety of visual, analytical, statistical, and graphical techniques. Scanning electron microscope images of tested surfaces were analyzed to see if testing conditions created visible debris or topographical changes to the surface.
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