Change search
ReferencesLink to record
Permanent link

Direct link
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.
UPTEC K, ISSN 1650-8297 ; 12011
National Category
Materials Chemistry
URN: urn:nbn:se:uu:diva-177273OAI: diva2:539943
Educational program
Master Programme in Chemical Engineering
Available from: 2012-07-06 Created: 2012-07-05 Last updated: 2012-07-06Bibliographically approved

Open Access in DiVA

Studie av belagda kolvringar mot plasmasprutat cylinderfoder(5248 kB)524 downloads
File information
File name FULLTEXT01.pdfFile size 5248 kBChecksum SHA-512
Type fulltextMimetype application/pdf

By organisation
Applied Materials Sciences
Materials Chemistry

Search outside of DiVA

GoogleGoogle Scholar
Total: 524 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 479 hits
ReferencesLink to record
Permanent link

Direct link