Assessment of Tribological Properties of Oil-Based Flake WS2-Oleic Acid Lubricant on Steel-Brass Sliding Contact

The current research focused on the tribological properties of flake-like WS2 particles dispersed into PAO4 base oil with oleic acid as surfactant. Various concentrations of 0.2 mass%, 1 mass% and 3 mass% were applied in the preparation of WS2-OA lubricant. The wear tests were carried out using a ba...

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Autores principales:	Yu Zhang, Bingxu Wang, Weiwei Cui, Gary C. Barber, Ming Hu
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2020
Materias:	flake ws2 particles oleic acid steel-brass contact friction reduction anti-wear behavior Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/3b87795c698a497395a158099c3d829b
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spelling	oai:doaj.org-article:3b87795c698a497395a158099c3d829b2021-11-05T09:08:01ZAssessment of Tribological Properties of Oil-Based Flake WS2-Oleic Acid Lubricant on Steel-Brass Sliding Contact1881-219810.2474/trol.15.293https://doaj.org/article/3b87795c698a497395a158099c3d829b2020-09-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/15/4/15_293/_pdf/-char/enhttps://doaj.org/toc/1881-2198The current research focused on the tribological properties of flake-like WS2 particles dispersed into PAO4 base oil with oleic acid as surfactant. Various concentrations of 0.2 mass%, 1 mass% and 3 mass% were applied in the preparation of WS2-OA lubricant. The wear tests were carried out using a ball-on-plate reciprocating sliding test configuration. It was found that the highest COF of 0.578 was obtained using PAO4 base oil with significant fluctuations. The COF could be reduced to approximately 0.34 and stabilized after adding the OA. When introducing the WS2 articles, the COF was around 0.158 under 0.2 mass%, 0.143 under 1 mass% and 0.145 under 3 mass%, and became almost constant after 4 min. In addition, the highest wear rate in width of 61.5 µm/m and in depth of 2.2 µm/m was found using PAO4 base oil. The wear rate can be reduced to 51.6 µm/m in width (16.1%) and 0.9 µm/m (59.1%) in depth under 3 mass% OA. While using the WS2 particles, the wear rate in width could be further reduced to 45.2 µm/m using 1 mass% but with slightly higher wear rate in depth than that of OA. Based on the analysis in SEM and EDX, the abrasive grooves became less after introducing the OA, some dark spots composed of carbon acted as tribo-films on the worn area. While using WS2 particles, it could be found that WS2 flakes were adhered on the surfaces to reduce the friction and wear.Yu ZhangBingxu WangWeiwei CuiGary C. BarberMing HuJapanese Society of Tribologistsarticleflake ws2 particlesoleic acidsteel-brass contactfriction reductionanti-wear behaviorPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 15, Iss 4, Pp 293-299 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	flake ws2 particles oleic acid steel-brass contact friction reduction anti-wear behavior Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	flake ws2 particles oleic acid steel-brass contact friction reduction anti-wear behavior Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Yu Zhang Bingxu Wang Weiwei Cui Gary C. Barber Ming Hu Assessment of Tribological Properties of Oil-Based Flake WS2-Oleic Acid Lubricant on Steel-Brass Sliding Contact
description	The current research focused on the tribological properties of flake-like WS2 particles dispersed into PAO4 base oil with oleic acid as surfactant. Various concentrations of 0.2 mass%, 1 mass% and 3 mass% were applied in the preparation of WS2-OA lubricant. The wear tests were carried out using a ball-on-plate reciprocating sliding test configuration. It was found that the highest COF of 0.578 was obtained using PAO4 base oil with significant fluctuations. The COF could be reduced to approximately 0.34 and stabilized after adding the OA. When introducing the WS2 articles, the COF was around 0.158 under 0.2 mass%, 0.143 under 1 mass% and 0.145 under 3 mass%, and became almost constant after 4 min. In addition, the highest wear rate in width of 61.5 µm/m and in depth of 2.2 µm/m was found using PAO4 base oil. The wear rate can be reduced to 51.6 µm/m in width (16.1%) and 0.9 µm/m (59.1%) in depth under 3 mass% OA. While using the WS2 particles, the wear rate in width could be further reduced to 45.2 µm/m using 1 mass% but with slightly higher wear rate in depth than that of OA. Based on the analysis in SEM and EDX, the abrasive grooves became less after introducing the OA, some dark spots composed of carbon acted as tribo-films on the worn area. While using WS2 particles, it could be found that WS2 flakes were adhered on the surfaces to reduce the friction and wear.
format	article
author	Yu Zhang Bingxu Wang Weiwei Cui Gary C. Barber Ming Hu
author_facet	Yu Zhang Bingxu Wang Weiwei Cui Gary C. Barber Ming Hu
author_sort	Yu Zhang
title	Assessment of Tribological Properties of Oil-Based Flake WS2-Oleic Acid Lubricant on Steel-Brass Sliding Contact
title_short	Assessment of Tribological Properties of Oil-Based Flake WS2-Oleic Acid Lubricant on Steel-Brass Sliding Contact
title_full	Assessment of Tribological Properties of Oil-Based Flake WS2-Oleic Acid Lubricant on Steel-Brass Sliding Contact
title_fullStr	Assessment of Tribological Properties of Oil-Based Flake WS2-Oleic Acid Lubricant on Steel-Brass Sliding Contact
title_full_unstemmed	Assessment of Tribological Properties of Oil-Based Flake WS2-Oleic Acid Lubricant on Steel-Brass Sliding Contact
title_sort	assessment of tribological properties of oil-based flake ws2-oleic acid lubricant on steel-brass sliding contact
publisher	Japanese Society of Tribologists
publishDate	2020
url	https://doaj.org/article/3b87795c698a497395a158099c3d829b
work_keys_str_mv	AT yuzhang assessmentoftribologicalpropertiesofoilbasedflakews2oleicacidlubricantonsteelbrassslidingcontact AT bingxuwang assessmentoftribologicalpropertiesofoilbasedflakews2oleicacidlubricantonsteelbrassslidingcontact AT weiweicui assessmentoftribologicalpropertiesofoilbasedflakews2oleicacidlubricantonsteelbrassslidingcontact AT garycbarber assessmentoftribologicalpropertiesofoilbasedflakews2oleicacidlubricantonsteelbrassslidingcontact AT minghu assessmentoftribologicalpropertiesofoilbasedflakews2oleicacidlubricantonsteelbrassslidingcontact
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Assessment of Tribological Properties of Oil-Based Flake WS2-Oleic Acid Lubricant on Steel-Brass Sliding Contact

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