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The lubrication of DLC coatings with mineral and biodegradable oils having different polar and saturation characteristics
Kalin, Mitjan
(
Author
),
Vižintin, Jože
(
Author
),
Vercammen, K.
(
Author
),
Barriga, J.
(
Author
),
Arnšek, Aleš
(
Author
)
URL - Presentation file, Visit
http://dx.doi.org/10.1016/j.surfcoat.2005.03.016
Abstract
Due to improved performance over the last decade, diamond-like carbon (DLC) coatings are more frequently used in highly loaded mechanical components that sometimes need to operate under boundary- or mixed-lubrication conditions. However, DLC coatings are considered as "inert" coatings with a low surface energy and their lubrication ability according to conventional metal-lubrication mechanisms is therefore questionable. In order to investigate whether the base oil polarity and saturation characteristics play a role in these processes, a tribological investigation of the a-C:H coating lubricated with natural (sunflower) and synthetic (saturated and un-saturated)biodegradable oils that posses different amount of polar components and double bonds was performed. For a comparison we also used mineral base oil with low polar component. The DLC/DLC and steel/steel contacts were tested with base oils without additives and in combination with AW and EP additives. Despite the higher wear compared to steel/steel contacts,the results suggest that the wear of DLC/DLC contacts can be importantly improved by using oils with more polar groups and non-saturated molecules. These findings, together with well-known and even proverbial "low-friction properties", suggest a great potential for the use of DLC coatings in combination with biodegradable oils, particularly when additives are present.
Language:
English
Keywords:
DLC coatings
,
biodegradable oil
,
lubrication
,
polarity
,
saturation
,
wear
,
friction
Work type:
Not categorized (r6)
Tipology:
1.01 - Original Scientific Article
Organization:
FS - Faculty of Mechanical Engineering
Year:
2006
Number of pages:
str. 4515-4522
Numbering:
Letn. 200, št. 14/15
UDC:
621.793:621.89
ISSN on article:
0257-8972
COBISS.SI-ID:
9063451
Views:
654
Downloads:
274
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Record is a part of a journal
Title:
Surface & coatings technology
Shortened title:
Surf. coat. technol.
Publisher:
Elsevier Sequoia
ISSN:
0257-8972
COBISS.SI-ID:
3084815
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