Enhancing the tribological performance under biodiesel lubrication using CVD diamond coated parts
authors Almeida, FA; Maru, MM; Shabani, M; Oliveira, FJ; Silva, RF; Achete, CA
nationality International
journal WEAR
author keywords CVD diamond coatings; Tribology; Biodiesel; Fuel-lubrication
keywords SILICON-NITRIDE; COATINGS; FUEL; FRICTION; BEHAVIOR; FILMS; OPTIMIZATION; COMPONENTS; LUBRICITY; ENGINES
abstract One important issue in internal combustion engines is the performance of injection pumping systems that is related to the energy efficiency of the engines. Considering that the trend is to increase the combustion pressure, new materials of lower weight, harder, wear and corrosion resistant, and compatible with the fuel environment, are needed. In this work, ball-on-flat reciprocating tests were performed with bare and CVD diamond coated Si3N4 materials lubricated by a commercial soybean-derived biodiesel. Experiments with AISI 52100 steel were also accomplished. Two types of coatings were tested: (i) a single layer (SL) of microcrystalline diamond (MCD) and (ii) a multilayered (ML) system made of three bilayers of MCD/nanocrystalline diamond (NCD). Results show that diamond coatings give lower friction coefficient values (COF) of 0.07, as the minimum, than that of the steel tribopair, which presents a COF above 0.10, which can limit engineering applications. The SL tribopair presents a higher initial COF peak (0.35) than ML (0.15) explained by the difference in surface roughness. Regarding the wear behaviour, all the tested materials have shown similar mild wear coefficients around 10(-8) mm(3) N-1 m(-1), the same observed in dry tests with CVD diamond coatings, which constitutes a further advantage when the system is running in lubricant starved conditions. (C) 2013 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE SA
issn 0043-1648
year published 2013
volume 302
issue 1-2
beginning page 1370
ending page 1377
digital object identifier (doi) 10.1016/j.wear.2013.01.090
web of science category Engineering, Mechanical; Materials Science, Multidisciplinary
subject category Engineering; Materials Science
unique article identifier WOS:000322682800060
  ciceco authors
  impact metrics
journal analysis (jcr 2019):
journal impact factor 4.108
5 year journal impact factor 4.169
category normalized journal impact factor percentile 78.474
dimensions (citation analysis):
altmetrics (social interaction):



 


Apoio

1suponsers_list_ciceco.jpg