Effects of alloying elements on diamond/Cu interface properties based on first-principles calculations
Jinjiang Han1, Xuefeng Yang1, Ying Ren1
1School of Materials Science and Engineering, Henan University of Technology, Zhengzhou 450001, People's Republic of China.
Journal of Physics. Condensed Matter : an Institute of Physics Journal
|December 20, 2022
Summary
Adding boron (B) or silicon (Si) to diamond/copper composites enhances interfacial bonding and heat transfer. These alloying elements improve thermal management material performance by strengthening the diamond-copper connection.
Area of Science:
- Materials Science
- Computational Materials Science
- Nanotechnology
Background:
- Diamond/copper composites are crucial for thermal management due to high thermal conductivity and tunable thermal expansion.
- Weak interfacial bonding between diamond and copper hinders achieving optimal composite thermal conductivity.
- Metal matrix alloying is a potential strategy to enhance interfacial properties in diamond/copper composites.
Purpose of the Study:
- To investigate the impact of various alloying elements on the interfacial properties of diamond/copper composites.
- To identify effective alloying elements for improving interfacial bonding and thermal transport in these composites.
Main Methods:
- Utilized first-principles calculations to simulate and analyze the effects of alloying elements (B, Cr, Hf, Mo, Nb, Si, Ti, V, Zr) on diamond/copper interfaces.
- Examined changes in interfacial bonding strength and electronic structure upon addition of alloying elements.
- Assessed phonon properties to understand heat transfer mechanisms at the interface.
Main Results:
- All investigated alloying elements successfully increased the interfacial bonding strength between diamond and copper.
- Enhanced bonding is attributed to stronger interactions between alloying element atoms and carbon atoms at the interface.
- Boron and silicon doping led to specific electronic structure modifications (wave peaks near Fermi energy) and favorable phonon properties (similar to diamond), promoting electron-phonon and phonon-phonon coupling.
Conclusions:
- Alloying elements significantly improve the interfacial bonding and thermal properties of diamond/copper composites.
- Boron and silicon emerge as particularly promising alloying elements for enhancing both interfacial bond strength and heat transfer.
- First-principles calculations provide valuable insights into designing advanced thermal management materials.
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