Abstract
The paper presents results of testing the resistance to motion of pistons whose bearing surface was coated with a layer of carbon nanotubes (CNTs). A part of this paper was devoted to the problems of applying a layer of nanotubes on the surface of an aluminum alloy, which is the most common material used for pistons. Obtaining a layer of nanotubes of a very narrow margin of tolerance was a difficult technological problem to overcome. A standard process of growing a layer of nanotubes leads to corrosion damage of the side surface of pistons; therefore, new technologies were developed which allow for obtaining a permanent layer of nanotubes less than 5 microns thick. Pistons with the bearing surface coated with a layer of nanotubes were mounted to the engine, and then measurements of the moment of momentary resistance to motion were performed. Also capturing phases of the engine work cycles in which the layer of nanotubes gives the best results seems to be possible. At present, long-term research is being carried out in order to determine the degree of the risk of exfoliation of the layer of CNT under the conditions of high mechanical and thermal loads.
Highlights
Since the invention of the piston combustion engine there has been research aimed at improving the parameters of work as well as durability of engine sets
Most frequently the surface refinement is in the form of hardening or applying a layer of chromium or other materials ensuring good frictional properties
By comparing the courses of torques of the combustion engine drive equipped with standard pistons and the ones coated with the layer of CNTs, one can notice the higher initial friction losses in the case of the pistons coated with CNTs, conventionally called SSNW
Summary
Since the invention of the piston combustion engine there has been research aimed at improving the parameters of work as well as durability of engine sets. For the last several years there has been a quick development of the possibilities of surface refinement by applying a layer of nanotubes. The authors assume to achieve tree main goals with the implementation of a layer of CNT on the piston bearing surface: – reduction of friction losses, – higher resistance to abrasive wear of mating elements, 1. Podstawą uzyskania tych efektów jest jednak opravelop the method of obtaining permanent, non-exfoliating cowanie metody uzyskiwania niełuszczących się warstw layers of nanotubes bound to the base, that is the refined nanorurek trwale związanych z podłożem, czyli uszlachetsurface. Węglowych (MWCNT – Multiwalled Carbon Nanotubes) na Conducting the CNT growth process while using the dużych powierzchniach, przy jednoczesnym zapewnieniu.
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