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(Ag,Cu)-Ta-O ternaries as high-temperature solid-lubricant coatings
Hongyu Gao1, Alberto Otero-de-la-Roza2, Jingjing Gu3
1†School of Engineering, University of California Merced, 5200 North Lake Road, Merced, California 95343, United States.
ACS Applied Materials & Interfaces
|June 25, 2015
Summary
Ternary oxides show promise as high-temperature solid lubricants. Metal cluster formation on surfaces explains their friction and wear behavior, with CuTa2O6 offering the best wear resistance.
Area of Science:
- Materials Science
- Tribology
- Solid Lubrication
Background:
- Ternary oxides are explored for solid lubricant applications at high temperatures.
- Understanding their tribological properties is crucial for material selection and design.
Purpose of the Study:
- To investigate the tribological properties of AgTaO3, CuTaO3, and CuTa2O6.
- To elucidate the underlying mechanisms governing friction and wear in these materials.
Main Methods:
- Density-functional theory (DFT) calculations.
- Molecular dynamics (MD) simulations with novel empirical potentials.
- Experimental tribological measurements.
Main Results:
- MD simulations predicted friction force trends consistent with experimental coefficients of friction (AgTaO3 < CuTaO3 < CuTa2O6).
- Wear resistance showed an inverse trend, with CuTa2O6 exhibiting superior performance.
- Analysis revealed metal/metal oxide cluster formation at the sliding interface.
Conclusions:
- Metal or metal oxide cluster formation on the surface is identified as the primary factor influencing friction and wear.
- The study provides insights into the tribological behavior of ternary oxides for high-temperature lubrication applications.
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