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Effects of Interfacial Bonding on Friction and Wear at Silica/Silica Interfaces

Author(s)
Li, Ao; Szlufarska, Izabela; Liu, Y.
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Abstract
Static friction between amorphous silica surfaces with a varying number of interfacial siloxane (Si–O–Si) bridges was studied using molecular dynamic simulations. Static friction was found to increase linearly with the applied normal pressure, which can be explained in the framework of Prandlt–Tomlinson’s model. Friction force was found to increase with concentration of siloxane bridges, but with a decreasing gradient, with the latter being due to interactions between neighboring siloxane bridges. In addition, we identified atomic-level wear mechanisms of silica. These mechanisms include both transfer of individual atoms accompanied by breaking interfacial siloxane bridges and transfer of atomic cluster initialized by rupturing of surface Si–O bonds. Our simulations showed that small clusters are continually formed and dissolved at the sliding interface, which plays an important role in wear at silica/silica interface.
Date issued
2014-10
URI
http://hdl.handle.net/1721.1/105434
Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Journal
Tribology Letters
Publisher
Springer US
Citation
Li, Ao et al. “Effects of Interfacial Bonding on Friction and Wear at Silica/Silica Interfaces.” Tribology Letters 56.3 (2014): 481–490
Version: Author's final manuscript
ISSN
1023-8883
1573-2711

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