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Materials 2018, 11(2), 180; https://doi.org/10.3390/ma11020180

Thermochemical Stability and Friction Properties of Soft Organosilica Networks for Solid Lubrication

1
Materials Innovation Institute (M2i), Elektronicaweg 25, 2628 XG Delft, The Netherlands
2
Inorganic Materials Science, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
3
Surface Technology and Tribology, Faculty of Engineering Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
*
Author to whom correspondence should be addressed.
Received: 25 November 2017 / Revised: 11 January 2018 / Accepted: 22 January 2018 / Published: 24 January 2018
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Abstract

In view of their possible application as high temperature solid lubricants, the tribological and thermochemical properties of several organosilica networks were investigated over a range of temperatures between 25 and 580 °C. Organosilica networks, obtained from monomers with terminal and bridging organic groups, were synthesized by a sol-gel process. The influence of carbon content, crosslink density, rotational freedom of incorporated hydrocarbon groups, and network connectivity on the high temperature friction properties of the polymer was studied for condensed materials from silicon alkoxide precursors with terminating organic groups, i.e., methyltrimethoxysilane, propyltrimethoxysilane, diisopropyldimethoxysilane, cyclohexyltrimethoxysilane, phenyltrimethoxysilane and 4-biphenylyltriethoxysilane networks, as well as precursors with organic bridging groups between Si centers, i.e., 1,4-bis(triethoxysilyl)benzene and 4,4′-bis(triethoxysilyl)-1,1′-biphenyl. Pin-on-disc measurements were performed using all selected solid lubricants. It was found that materials obtained from phenyltrimethoxysilane and cyclohexyltrimethoxysilane precursors showed softening above 120 °C and performed best in terms of friction reduction, reaching friction coefficients as low as 0.01. This value is lower than that of graphite films (0.050 ± 0.005), a common bench mark for solid lubricants. View Full-Text
Keywords: lubricants; silica; hybrids; coefficient of friction; oxides lubricants; silica; hybrids; coefficient of friction; oxides
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Gonzalez Rodriguez, P.; Dral, A.P.; van den Nieuwenhuijzen, K.J.H.; Lette, W.; Schipper, D.J.; ten Elshof, J.E. Thermochemical Stability and Friction Properties of Soft Organosilica Networks for Solid Lubrication. Materials 2018, 11, 180.

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