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Diamond Formation at Superlubric Sliding Interface
Yongfu Wang1, Xing Yang1, Ruiyun Li2
1State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou, China.
Advanced Materials (Deerfield Beach, Fla.)
|June 26, 2026
Summary
Scientists achieved diamond formation at superlubric sliding interfaces, a feat previously impossible due to high energy barriers. This discovery in tribology could lead to new applications in materials science and friction reduction.
Area of Science:
- Materials Science
- Tribology
- Nanotechnology
Background:
- Carbon materials typically graphitize at mechanical interfaces.
- Diamond formation requires extreme pressures and temperatures, making it difficult at interfaces.
Purpose of the Study:
- To investigate diamond formation at superlubric sliding interfaces.
- To overcome the kinetic barriers preventing diamond synthesis under friction.
Main Methods:
- Sliding aluminum oxide balls against Molybdenum disulfide-coated amorphous carbon surfaces.
- Utilizing van der Waals encapsulation of wear debris.
- Performing atomistic simulations to analyze structural transformations.
Main Results:
- Diamond formation was observed at a superlubric interface (friction coefficient of 0.008).
- Encapsulation reduced potential energy by 30% and accelerated relaxation dynamics 2.0-fold.
- A disproportionation transformation led to diamond synthesis.
Conclusions:
- Diamond can form at low-friction mechanical interfaces.
- This finding challenges previous understanding of carbon behavior under friction.
- Opens new avenues for research in materials science and tribology.
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