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Nanoscale Wear Triggered by Stress-Driven Electron Transfer
Yangyang Lu1, Chen Xiao2,3, Yilong Jiang1
1School of Mechanical Engineering, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China.
Nano Letters
|September 20, 2023
Summary
Nanoscale wear, driven by stress, involves electron transfer that breaks interfacial bonds, advancing understanding of material surface wear and manufacturing. This differs from classical wear laws.
Area of Science:
- Materials Science
- Tribology
- Surface Science
Background:
- Sliding contact wear causes significant device failure and energy loss.
- The fundamental microscopic mechanisms driving wear at interfaces under stress remain largely unelucidated.
Purpose of the Study:
- To investigate the nanoscale wear mechanisms between silicon and silicon dioxide under stress.
- To elucidate the role of mechanical stress in activating wear processes at the atomic level.
Main Methods:
- Single-asperity wear experiments were conducted on silicon against silicon dioxide.
- Density functional theory (DFT) calculations were employed to model atomistic wear reactions.
- An atomistic wear model was developed integrating stress-driven electron transfer and Maxwell-Boltzmann statistics.
Main Results:
- The wear rate of silicon in ambient air exhibits exponential dependence on stress, deviating from Archard's law.
- Mechanical stress was found to linearly drive electron transfer, initiating sequential interfacial bond formation and rupture.
- A novel atomistic wear model was established based on these findings.
Conclusions:
- The study reveals a stress-driven electron transfer mechanism governing nanoscale wear.
- This electronic insight offers a new perspective on wear phenomena, potentially improving material surface engineering and manufacturing processes.
- Understanding nanoscale wear is crucial for enhancing the durability and efficiency of mechanical systems.
