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Studie av belagda kolvringarmot plasmasprutat cylinderfoder: Med avseende på friktion och nötningsmotstånd
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
2012 (Swedish)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Future emission legislation puts great emphasis on increasing the efficiency of the engine, thereby reducing fuel consumption. The tribological contact between cylinder liner and piston ring is where an great amount of energy is lost due to friction, and by reducing these losses an reduction in fuel consumption can be achieved.

The aim of this thesis was to evaluate the tested piston ring coatings against a plasma sprayed cylinder liner and rank these combinations of materials for friction and wear resistance. The coatings that were tested was Cr + Al2O3, (Al,Cr)N, two types of CrN and WC / C.

The experimental tests were performed with a so-called pin-plate, where used oil with addition of an acidic mixture of sulfuric and nitric acid to mimic the acidic condensate formed when exhausts recirculate, were added with a continuous flow. The results were then analyzed by weighing, studies by optical microscopy and scanning electron microscopy (SEM) and profile measurements.

The results from each material combination were that the plasma coated cylinder liner wears too aggressively in order to yield a ranking of the piston ring coatings based on the parameters of friction and wear resistance. It is therefore proposed that an alternative coating on the cylinder liner should be developed, lacking the large abrasive wear on piston rings and that can withstand the corrosive environment resulting in engines equipped with EGR. Thereafter, a study can be carried out to find a piston ring coating that has low friction and high wear resistance.

Place, publisher, year, edition, pages
2012. , 42 p.
Series
UPTEC K, ISSN 1650-8297 ; 12011
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-177273OAI: oai:DiVA.org:uu-177273DiVA: diva2:539943
Educational program
Master Programme in Chemical Engineering
Uppsok
Technology
Supervisors
Examiners
Available from: 2012-07-06 Created: 2012-07-05 Last updated: 2012-07-06Bibliographically approved

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