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Open AccessArticle

Friction and Tribo-Chemical Behavior of SPD-Processed CNT-Reinforced Composites

1
Chair of Functional Materials, Saarland University, Campus D3.3, 66123 Saarbrücken, Germany
2
Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstrasse 12, 8700 Leoben, Austria
*
Authors to whom correspondence should be addressed.
Lubricants 2019, 7(9), 75; https://doi.org/10.3390/lubricants7090075
Received: 10 July 2019 / Revised: 20 August 2019 / Accepted: 27 August 2019 / Published: 30 August 2019
Nickel (Ni) and carbon nanotube (CNT)-reinforced Ni-matrix composites were manufactured by solid state processing and severely deformed by high-pressure torsion (HPT). Micro-tribological testing was performed by reciprocating sliding and the frictional behavior was investigated. Tribo-chemical and microstructural changes were investigated using energy dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM) and focused ion beam (FIB). The CNT lubricity was hindered due to the continuous formation of a stable oxide layer promoted by a large grain boundary area and by irreversible damage introduced to the reinforcement during HPT, which controlled the frictional behavior of the studied samples. The presence of CNT reduced, to some extent, the tribo-oxidation activity on the contact zone and reduced the wear by significant hardening and stabilization of the microstructure. View Full-Text
Keywords: carbon nanotubes; metal matrix composites; severe plastic deformation; reciprocating sliding carbon nanotubes; metal matrix composites; severe plastic deformation; reciprocating sliding
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MDPI and ACS Style

Aristizabal, K.; Tayrac, A.; Katzensteiner, A.; Bachmaier, A.; Suarez, S. Friction and Tribo-Chemical Behavior of SPD-Processed CNT-Reinforced Composites. Lubricants 2019, 7, 75.

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