Abstract
In this work, three case studies are reported, namely carbon nanotube/polyvinyl butyral composites, MWCNTs/polydimethylsiloxane-based coatings and vertically aligned CNT forest array, of which the friction and resistance to wear/deformation were assessed through nanoindentation/nanoscratch. Additional deformation parameters and findings are also addressed and discussed; namely, material deformation upwards (pile-up) or downwards (sink-in) with respect to the indented surface plane, hardness to modulus ratio (index of resistance to wear) and coefficient of friction. The enhancement of the scratch resistance due to the incorporation of CNTs in a polymer matrix is investigated. For the case of the forest structure, sliding between neighboring nanotubes is identified, while, through ploughing of the tip, local deformation and the extent of plasticity are also addressed.
Highlights
Composites with nanofillers form a promising new group of materials which align the advantages of both the matrix and filling material, with the prerequisite of strong interfacial bonding [1]
Three different functionalized were investigated and the results indicate that compared with pure epoxy resin, Multi-wall CNTs (MWCNTs) composites exhibited decreased friction coefficient and wear rate; to this regard, MWCNTs—epoxy composites improve the wear resistance and decrease the coefficient of friction
For the carbon nanotube/polyvinyl butyral composites case, as Carbon nanotubes (CNTs) concentration is increased (PVBC5.0, where 5.0 indicated the CNT addition percentage (5%)), a large raise in the stiffness of the system is evidenced, which leads to energy dissipated reduction during the experiment; there is more tube–tube slip in the system at higher concentration, since percolation, coupled to sufficient dispersion leads to a higher contact surface among CNTs
Summary
Composites with ( carbon-based) nanofillers form a promising new group of materials which align the advantages of both the matrix (polymer mostly) and filling material, with the prerequisite of strong interfacial bonding [1]. Recent findings on the utilization of CNTs in tribology mainly for anti-friction, wear-proof and self-lubrication, address direct insertion of CNTs as additives/fillers in various lubricant media in liquid state or embedded as fillers in polymer, metal and ceramic matrices Critical issues such as processing technique, CNT dispersion and interfacial bonding have to be confronted, as the mechanisms should be considered with respect to the improvement in tribological performance [14]. As operating environment in many industrial applications results in the pair under tribo conditions to operate in the mixed lubrication regime; when the lubricant layer thickness is insufficient to separate the sliding, usage of lubricant with anti-wear additives is essential To this regards, recent studies include experiments conducted on block and disk test setup to determine the effect of using. Three case studies are reported, namely carbon nanotube/polyvinyl butyral composites [15], MWCNTs/polydimethylsiloxane-based coatings [16] and vertically aligned CNT forest array [17], of which the friction and resistance to wear/deformation were assessed through nanoindentation/nanoscratch
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