Enhanced tribological properties of diesel engine oil with Nano-Lanthanum hydroxide/reduced graphene oxide composites

Nano-lanthanum hydroxide/reduced graphene oxide (nano-La(OH)3/RGO) composites were successfully prepared as anti-wear additives for diesel engine oil. Response surface methodology was adopted to explore the influences of temperature, contact pressure, and composite concentration on the tribological...

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Bibliographic Details
Published in:Tribology international 2020-01, Vol.141, p.105951, Article 105951
Main Authors: Wu, Bo, Song, Hui, Li, Chuan, Song, Ruhong, Zhang, Tianming, Hu, Xianguo
Format: Article
Language:English
Subjects:
Additives
Antiwear additives
Automotive parts
Boundary lubrication
Composite materials
Composites
Contact pressure
Diesel engines
Graphene
Graphene oxide
Lanthanum
Lanthanum oxides
Lubrication
Nano-La(OH)3
Response surface methodology
Surface properties
Tribological properties
Tribology
Trucking industry
Wear mechanisms
Wear resistance
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Summary:Nano-lanthanum hydroxide/reduced graphene oxide (nano-La(OH)3/RGO) composites were successfully prepared as anti-wear additives for diesel engine oil. Response surface methodology was adopted to explore the influences of temperature, contact pressure, and composite concentration on the tribological properties of diesel engine oil. The anti-wear mechanism of nano-La(OH)3/RGO composites was simultaneously studied by comparing with the tribological behavior of graphene oxide and nano-La(OH)3 pure particles. Results indicate that nano-La(OH)3/RGO composites can remarkably improve the anti-wear performance of diesel engine oil under boundary lubrication conditions. In particular, the anti-wear performance of diesel engine oil increased by 44% after adding 0.1 wt% composites at a temperature of 80 °C and a contact pressure of 1.62 GPa. The synergistic anti-wear mechanism of graphene and lanthanum oxide was proposed on the basis of worn surface characterization. •Nano-La(OH)3/Reduced Graphene Oxide composite was prepared.•Composites improved the wear resistance of engine oil under boundary lubrication.•RSM was employed to analyze the tribological behavior of composites.•The synergistic anti-wear mechanism of graphene and lanthanum oxide was proposed.
ISSN:0301-679X
1879-2464
DOI:10.1016/j.triboint.2019.105951