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Sliding friction between two silicon-carbide surfaces

Piroozan, Nariman and Naserifar, Saber and Sahimi, Muhammad (2019) Sliding friction between two silicon-carbide surfaces. Journal of Applied Physics, 125 (12). Art. No. 124301. ISSN 0021-8979.

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Sliding friction between two SiC surfaces is important due to its relevance to many practical applications. It is also important to study whether kinetic friction at the nanoscale follows Coulomb’s law. Since SiC exists both as an amorphous material and with a crystalline structure, the effect of surface roughness on the kinetic friction may also be significant. We report the results of an extensive molecular dynamics simulation of sliding friction between surfaces of the two types of SiC over a wide range of sliding velocities. The amorphous SiC was generated by the reactive force field ReaxFF, which was also used to represent the interaction potential for the simulation of sliding friction. As the sliding velocity increases, bond breaking occurs at the interface between the two surfaces, leading to their roughening and formation of excess free volume. They reduce the kinetic friction force, hence resulting in decreasing the difference between kinetic friction in the amorphous and crystalline surfaces. The average kinetic friction force depends nonlinearly on the sliding velocity V, implying that Coulomb’s law of friction is not satisfied by the surfaces that we study at the nanoscale. The average kinetic friction force F_k depends on V as F_k ∝ ln V.

Item Type:Article
Related URLs:
URLURL TypeDescription
Naserifar, Saber0000-0002-1069-9789
Sahimi, Muhammad0000-0002-8009-542X
Additional Information:© 2019 Published under license by AIP Publishing. Submitted: 18 December 2018; Accepted: 8 March 2019; Published Online: 26 March 2019. The computations were carried out using the facilities of the University of Southern California High Performance Computing Center.
Issue or Number:12
Record Number:CaltechAUTHORS:20190417-144155419
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Official Citation:Sliding friction between two silicon-carbide surfaces. Nariman Piroozan, Saber Naserifar, and Muhammad Sahimi. Journal of Applied Physics 2019 125:12; doi: 10.1063/1.5086185
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:94755
Deposited By: Tony Diaz
Deposited On:17 Apr 2019 21:47
Last Modified:02 Apr 2020 16:23

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