Investigating the micropitting and wear performance of copper oxide and tungsten carbide nanofluids under boundary lubrication

The potential of copper oxide (CuO) and tungsten carbide (WC) nanofluids in enhancing micropitting and wear behavior of AISI 8620 steel under boundary lubrication conditions was investigated. The nanofluids consisted of 1% nanoparticles by weight and 1% by weight of oleic acid surfactant in Polyalph...

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Bibliographic Details
Published in:Wear 2019-06, Vol.428-429, p.55-63
Main Authors: Roy, Sougata, Jazaa, Yosef, Sundararajan, Sriram
Format: Article
Language:English
Subjects:
Boundary lubrication
Copper oxides
Fatigue cracks
Fatigue tests
Lubricant additives
Lubrication
Micropitting
Nanofluids
Nanoparticles
Nickel chromium molybdenum steels
Oleic acid
Rolling contact
Rolling contact fatigue
Surface cracks
Tungsten carbide
Ultrasonic testing
Wear mechanisms
Wear resistance
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Summary:The potential of copper oxide (CuO) and tungsten carbide (WC) nanofluids in enhancing micropitting and wear behavior of AISI 8620 steel under boundary lubrication conditions was investigated. The nanofluids consisted of 1% nanoparticles by weight and 1% by weight of oleic acid surfactant in Polyalphaolefin (PAO). Rolling contact fatigue tests were conducted using a micropitting test rig (MPR). Both the nanofluids exhibited increased micropitting life compared to the base oil. Tungsten carbide nanofluids showed significantly higher micropitting and wear resistance behavior than the CuO nanofluids under the boundary lubrication regime. Analysis of the surfaces showed different mechanisms to inhibit micropitting and wear for the two nanofluids. The WC nanofluid formed a tribofilm whereas the CuO nanofluids tended to fill surface cracks with the nanoparticles. •Surface topography of both nanofluid lubricated surfaces was significantly improved compared to base oil.•WC nanofluid was the best performing candidate in terms of micropitting and wear resistance.•WC nanoparticle based tribofilm formation was the main mechanism behind the improved RCF life.
ISSN:0043-1648
1873-2577
DOI:10.1016/j.wear.2019.03.007