Influence of Composition of Plant Oils on Their Tribological Properties

Abstract

Sunflower, corn, rapeseed, olive, and linseed oils were used for investigation. Their fatty-acid compositions have been evaluated by gas chromatography. The tribological properties were determined with a four-ball machine. Flash and set points, static and dynamic viscosity of the oils were estimated by standard methods. The results of tests show that refined plant oils possess better tribotechnical properties than the base mineral oil without additives. It was found that their antiwear and bearing resistance properties correlate with the structure of fatty acids molecules. It is demonstrated that the activation of unsaturated bonds as a result of the triglycerides oxidation has a positive influence on friction due to tribopolymerization and film formation on the contact surfaces.

Fabrication of polytetrafluoroethylene–carbon nanotube composite coatings for friction and wear reduction

“…The approximate diameter of the droplets was 0.5 mm. The surface energy characteristics of the coatings were assessed since they are known to be related to friction and wear properties of polymers [8,9]. The contact angle of the pure PTFE coating (P0) was 468 prior to heat treatment and it approximately tripled to 1358 after heat treatment.…”

“…Many types of materials can be used as coatings in tribological applications including ceramics, metals, and polymers. Specifically, polymers are often used as replacements for metals in various mechanical systems for many reasons [8][9][10]. Compared to metal components, polymeric components do not produce as much noise, have better self-lubricating ability, and are lighter.…”

Evaluation of the Oil-Rich Waste Fillers’ Influence on the Tribological Properties of Polylactide-Based Composites

“…As it was found by Quinchia et al, different vegetable oils can serve as lubricants in a wide range of conditions [ 27 ]. As Myshkin, Grigoriev, and Kavaliova found out, linseed oil presents even better tribological characteristics than a base mineral oil [ 28 ]. The advantageous tribological properties of different plant oils modified with boric acid were also shown by Trzepieciński in their paper [ 29 ].…”

“…The advantageous tribological properties of different plant oils modified with boric acid were also shown by Trzepieciński in their paper [ 29 ]. To summarize, while the mechanisms of the influence of various types of natural oils on the tribological properties of polymers have been considered before [ 14 , 28 , 29 ], no description of the influence of complex modification phenomena induced by the incorporation of fillers with high oil content on tribological properties of thermoplastic composites has been reported so far. In this case, the influence of oil on changes in the wear of composite samples will result from both polymeric structural changes caused by the presence of lignocellulosic filler and the effects of oil migration.…”

Analysis of strain bursts during nanoindentation creep of high-density polyethylene

“…Although this paper reports on nanoindentation investigations, they have been performed such that the hardness reflects mechanical properties typical of the bulk and not of the surface, as is usually done in tribological science. 1,2 Therefore, features of plastic deformation and the related strengthening of polymers can be studied with this method. The determination of the mechanical properties and the understanding of plastic deformation of polymers are more complex than for many other materials, since polymers exhibit a pronounced time dependence in their response to load.…”