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Pingyu Zhang - One of the best experts on this subject based on the ideXlab platform.
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Tribological characteristic and mechanism analysis of borate ester as a Lubricant Additive in different base oils
RSC Advances, 2020Co-Authors: Guangbin Yang, Shengmao Zhang, Laigui Yu, Shiyong Song, Junhua Zhao, Pingyu ZhangAbstract:A kind of N-containing borate ester (DEBE) with a double five-member-ring structure as a Lubricant Additive was synthesized by using boric acid, diethanolamine and alkylphenol polyoxyethylene ether as the starting materials. The tribological performance of the as-prepared DEBE was evaluated using a four-ball friction and wear tester in different base oils, such as liquid paraffin (LP), poly-alpha-olefin (PAO) and dioctyl sebacate (DIOS), while the morphologies of the worn scars of the steel balls were observed using a scanning electron microscope. The chemical components on the worn surfaces of the steel balls were analyzed using X-ray photoelectron spectroscopy. The tribological mechanisms in base oils of LP, PAO and DIOS were also explored. The results show that as-prepared borate ester DEBE possessed good antiwear properties in LP and PAO and can be used as a promising S- and P-free environmentally acceptable lubricating oil Additive. However, the antiwear ability decreased when the Additive DEBE was added to DIOS base oil. The antiwear ability of the DEBE borate esters used as an Additive in DIOS might be closely related to competitive adsorption between DEBE borate ester and DIOS ester oil. Namely, compared with the DEBE Additive, the DIOS base oil is first to adsorb to the metal surface because of the higher polarity. Moreover, a small amount of the Additive absorbed on the metal surface may influence the continuity and compactness of the oil film formed by DIOS alone, resulting in destruction of the tribological properties of DIOS.
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tribological properties of oleic acid modified zinc oxide nanoparticles as the Lubricant Additive in poly alpha olefin and diisooctyl sebacate base oils
RSC Advances, 2016Co-Authors: Lili Wu, Shengmao Zhang, Laigui Yu, Guangbin Yang, Yujuan Zhang, Pingyu ZhangAbstract:Oleic acid (OA) modified ZnO nanoparticles with an average size of 4.04 nm were prepared via a facile in situ one-step route. The as-prepared ZnO nanoparticles were characterized by X-ray diffraction, transmission electron microscopy, and Fourier transform infrared spectroscopy. The light-absorbing performance and thermal stability of the as-prepared ZnO nanoparticles were evaluated by ultraviolet-visible light spectrophotometry and thermogravimetric analysis, and their tribological behaviour as the Lubricant Additive in poly-alpha olefin (PAO) and diisooctyl sebacate (DIOS) base oils was evaluated with a four-ball machine. The surface morphology of the wear scar was observed with a scanning electron microscope and a three-dimensional optical profiler, and the element composition of the wear scar was determined by energy dispersive spectrometry. It was found that the surface-capping of ZnO nanoparticles by OA helps to greatly increase their dispersibility and thermal stability. In the meantime, OA-modified ZnO nanoparticles can effectively improve the antiwear and friction-reducing abilities as well as the load-carrying capacity of the base oils, which is due to the formation of a tribofilm in association with the tribo-sintering and/or adsorption of the Additives on the rubbed steel surfaces. Furthermore, the friction-reducing and antiwear performances of the as-prepared ZnO nanoparticles as lubricating oil Additives seem to be closely related to the polarity of the base oils. Namely, the OA-modified ZnO Additive exhibits better tribological behaviour in apolar PAO than in polar DIOS.
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preparation and tribological properties of surface capped copper nanoparticle as a water based Lubricant Additive
Tribology Letters, 2014Co-Authors: Chunli Zhang, Shengmao Zhang, Laigui Yu, Zhishen Wu, Shiyong Song, Guangbin Yang, Xiaohong Li, Pingyu ZhangAbstract:Cu nanoparticle surface-capped by methoxylpolyethyleneglycol xanthate was synthesized using in situ surface-modification technique. The size, morphology and phase structure of as-prepared Cu nanoparticle were analyzed by means of X-ray diffraction and transmission electron microscopy. The tribological properties of as-synthesized Cu nanoparticle as an Additive in distilled water were investigated with a four-ball machine, and the morphology and elemental composition of worn steel surfaces were examined using X-ray photoelectron spectroscopy and scanning electron microscope equipped with an energy-dispersive spectrometer attachment. Results show that as-synthesized Cu nanoparticle as a water-based Lubricant Additive is able to significantly improve the tribological properties and load-carrying capacity of distilled water, which is ascribed to the deposition of Cu nanoparticles on steel sliding surfaces giving rise to a protective and lubricious Cu layer thereon. In the meantime, they may also tribochemically react with rubbing steel surfaces to generate a boundary lubricating film consisting of Cu, FeS and FeSO4 on the rubbed steel surface, which helps to result in greatly improved tribological properties of distilled water, thereby reducing friction and wear of the steel–steel pair.
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Preparation and tribological properties of water-soluble copper/silica nanocomposite as a water-based Lubricant Additive
Applied Surface Science, 2012Co-Authors: Chunli Zhang, Shengmao Zhang, Laigui Yu, Zhijun Zhang, Zhishen Wu, Pingyu ZhangAbstract:Abstract Cu/SiO 2 nanocomposite was synthesized by sol–gel method. The size, morphology and phase structure of as-prepared Cu/SiO 2 nanocomposite were analyzed by means of X-ray diffraction and transmission electron microscopy, and its ultraviolet-visible light spectrum was measured in relation to surface plasmon excitation of Cu particles. The tribological properties of as-synthesized Cu/SiO 2 nanocomposite as an Additive in distilled water were investigated with a four-ball machine, and the morphology and elemental composition of worn steel surfaces were examined with a scanning electron microscope and an X-ray photoelectron spectroscope. Results show that as-synthesized Cu/SiO 2 nanocomposite as a Lubricant Additive is able to significantly improve the tribological properties of distilled water. A protective and lubricious film composed of Cu and a small amount of FeS, FeSO 4 and SiO 2 is formed on steel sliding surfaces lubricated by distilled water containing Cu/SiO 2 nanocomposite. During friction process Cu nanoparticles can be released from Cu/SiO 2 nanocomposite to fill up micro-pits and grooves of steel sliding surfaces, resulting in greatly reduced friction and wear of steel frictional pair via self-repairing. The state and thickness of the film formed on the worn surface is closely related to applied load; and Cu/SiO 2 nanocomposite might be a promising water-based Lubricant Additive for steel-steel contact subjected to moderate load.
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preparation and tribological properties of water soluble copper silica nanocomposite as a water based Lubricant Additive
Applied Surface Science, 2012Co-Authors: Chunli Zhang, Shengmao Zhang, Laigui Yu, Zhijun Zhang, Zhishen Wu, Pingyu ZhangAbstract:Abstract Cu/SiO 2 nanocomposite was synthesized by sol–gel method. The size, morphology and phase structure of as-prepared Cu/SiO 2 nanocomposite were analyzed by means of X-ray diffraction and transmission electron microscopy, and its ultraviolet-visible light spectrum was measured in relation to surface plasmon excitation of Cu particles. The tribological properties of as-synthesized Cu/SiO 2 nanocomposite as an Additive in distilled water were investigated with a four-ball machine, and the morphology and elemental composition of worn steel surfaces were examined with a scanning electron microscope and an X-ray photoelectron spectroscope. Results show that as-synthesized Cu/SiO 2 nanocomposite as a Lubricant Additive is able to significantly improve the tribological properties of distilled water. A protective and lubricious film composed of Cu and a small amount of FeS, FeSO 4 and SiO 2 is formed on steel sliding surfaces lubricated by distilled water containing Cu/SiO 2 nanocomposite. During friction process Cu nanoparticles can be released from Cu/SiO 2 nanocomposite to fill up micro-pits and grooves of steel sliding surfaces, resulting in greatly reduced friction and wear of steel frictional pair via self-repairing. The state and thickness of the film formed on the worn surface is closely related to applied load; and Cu/SiO 2 nanocomposite might be a promising water-based Lubricant Additive for steel-steel contact subjected to moderate load.
Bo Yu - One of the best experts on this subject based on the ideXlab platform.
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ionic liquid modified multi walled carbon nanotubes as Lubricant Additive
Tribology International, 2015Co-Authors: Bo Yu, Feng ZhouAbstract:Abstract Multi-walled carbon nanotubes (MWCNTs) were modified by imidazolium-based ionic liquid (IL), 1-hydroxyethyl-3-hexyl imidazolium tetrafluoroborate and used as an Additive in base stock IL 1-methyl-3-butylimidazolium tetrafluoroborate as the base Lubricant. The effectiveness of using the IL- modified MWCNTs as Lubricant Additive was evaluated using a ball-on-plate configuration on an Optimol SRV oscillating friction and wear tester. The worn surfaces were examined using scanning electron microscope and the chemical composition on wear tracks was analyzed on an X-ray photoelectron spectrometer. Results suggest excellent anti-wear properties for the IL-modified MWCNTs as Lubricant Additive.
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antiwear performance and mechanism of an oil miscible ionic liquid as a Lubricant Additive
ACS Applied Materials & Interfaces, 2012Co-Authors: Jun Qu, Dinesh G Bansal, Huaqing Li, Jane Y. Howe, Gregory Mordukhovich, Bruce G. Bunting, Bo Yu, Peter J. Blau, Donald John SmolenskiAbstract:An ionic liquid (IL) trihexyltetradecylphosphonium bis(2-ethylhexyl) phosphate has been investigated as a potential antiwear Lubricant Additive. Unlike most other ILs that have very low solubility in nonpolar fluids, this IL is fully miscible with various hydrocarbon oils. In addition, it is thermally stable up to 347 °C, showed no corrosive attack to cast iron in an ambient environment, and has excellent wettability on solid surfaces (e.g., contact angle on cast iron <8°). Most importantly, this phosphonium-based IL has demonstrated effective antiscuffing and antiwear characteristics when blended with lubricating oils. For example, a 5 wt % addition into a synthetic base oil eliminated the scuffing failure experienced in neat oil and, as a result, reduced the friction coefficient by 60% and the wear rate by 3 orders of magnitude. A synergistic effect on wear protection was observed with the current antiwear Additive when added into a fully formulated engine oil. Nanostructure examination and composition ...
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A novel Lubricant Additive based on carbon nanotubes for ionic liquids
Materials Letters, 2008Co-Authors: Bo Yu, Feng Zhou, Yongmin LiangAbstract:Abstract Room Temperature Ionic Liquid (RTIL)/Multi-Walled Carbon Nanotubes (MWNTs) composite was prepared by chemical modification. The composite was analyzed by using laser Raman spectroscopy and X-ray photoelectron spectroscopy. The RTIL/MWNTs composite was evaluated as Lubricant Additive in ionic liquid due to their excellent dispersibility. Tribological performances of RTIL/MWNTs composite as Lubricant Additive were performed on a universal UMT-2MT Tribo-tester. It is found that RTIL/MWNTs composite showed good friction-reduction and anti-wear properties in friction process. It is concluded that RTIL/MWNTs composite might play the role of roller bearing during friction process.
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A novel Lubricant Additive based on carbon nanotubes for ionic liquids
Materials Letters, 2008Co-Authors: Bo Yu, Zhilu Liu, Wei-min Liu, Feng Zhou, Yongmin LiangAbstract:Room Temperature Ionic Liquid (RTIL)/Multi-Walled Carbon Nanotubes (MWNTs) composite was prepared by chemical modification. The composite was analyzed by using laser Raman spectroscopy and X-ray photoelectron spectroscopy. The RTIL/MWNTs composite was evaluated as Lubricant Additive in ionic liquid due to their excellent dispersibility. Tribological performances of RTIL/MWNTs composite as Lubricant Additive were performed on a universal UMT-2MT Tribo-tester. It is found that RTIL/MWNTs composite showed good friction-reduction and anti-wear properties in friction process. It is concluded that RTIL/MWNTs composite might play the role of roller bearing during friction process. © 2008 Elsevier B.V. All rights reserved.
Jing Zhang - One of the best experts on this subject based on the ideXlab platform.
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advanced silicate based Lubricant Additive induced diamond like carbon structured restoration layer
Tribology International, 2015Co-Authors: Jing Zhang, Yanhong GuAbstract:Abstract An advanced silicate based Lubricant Additive has been employed in long-term pin-on-disk tribological experiments. The worn steel/steel surfaces were characterized using nano-indentation, SEM, XPS, and Raman spectroscopy for their physical, mechanical, and chemical properties. The average nano-hardness of the repaired layers on the disk and the pin is 10.2 GPa and 16.7 GPa respectively, which is substantially higher than that of the disk (HV 221, or 0.71 GPa) and the pin (HRC55, or 1.8 GPa) before tribological tests, forming super hard surfaces on the contact pair surfaces. Combined Raman spectroscopy and XPS studies suggest the formation of diamond-like carbon based restoration layers. A new formation mechanism of the restoration DLC layer contributing to hard and smooth contact surfaces is proposed.
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long term surface restoration effect introduced by advanced silicate based Lubricant Additive
Tribology International, 2013Co-Authors: Jing Zhang, Bin Tian, Chengbiao WangAbstract:Abstract Long-term effect (up to 300 h) of an advanced silicate based Lubricant Additive on the tribological properties is studied using a newly designed pin-on-disk tester. With the Additive, the coefficient of friction was reduced by ∼40%. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) examinations showed that a smooth and high C-content outer layer was formed on the specimen surfaces, suggesting possible formation of diamond-like carbon (DLC) films. Using nano-hardness measurements, the hardness of the layer on the disk and the pin were 10.2 GPa and 16.7 GPa respectively. Wear loss and ferrographic analyses indicated that a “negative wear” occurred when the Additive was applied, suggesting the debris particles were captured by the specimen to form a self-repairing layer.
Feng Zhou - One of the best experts on this subject based on the ideXlab platform.
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ibuprofen based ionic liquids as Additives for enhancing the lubricity and antiwear of water ethylene glycol liquid
Tribology Letters, 2017Co-Authors: Yurong Wang, Qiangliang Yu, Feng ZhouAbstract:Ibuprofen-based (L-Ibu) halogen-free ionic liquids (ILs) were synthesized and evaluated as water-based Lubricant Additive. In contrast to the conventional ILs with fluoro-containing anions, the present L-Ibu ILs have no corrosive attack to steel and cast iron even in the water environment and exhibit extremely stable hydrolytic stability in water–ethylene glycol (W–EG) system. In addition, the Ibuprofen ILs as the water-based Lubricant Additives have better friction-reducing, extreme-pressure and antiwear properties than a commercial antiwear water-based Lubricant Additive of Hostagliss L4. The mechanism for excellent lubricating characteristics is investigated by combining electrical contact resistance measurement, X-ray photoelectron spectroscopy and interfacial adsorption behaviour by quartz crystal microbalance. The results indicate that a formed protective film on the contact surface prevents the direct contact of sliding pairs and contributes to the friction reduction and antiwear properties. More importantly, the prepared ILs provide a comparatively green alternative to the traditional halogenated ILs for the water-based lubrication application owing to halogen-, sulphur-, and phosphorus-free. So, these ILs are expected to develop into a highly efficient Lubricant Additive applied in water-based hydraulic fluids.
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Fluorinated Candle Soot as the Lubricant Additive of Perfluoropolyether
Tribology Letters, 2017Co-Authors: Guowei Huang, Zhengfeng Ma, Meirong Cai, Qiangliang Yu, Feng ZhouAbstract:In order to improve the tribological properties of perfluoropolyethers (PFPE), fluorinated candle soot is adopted as the Lubricant Additive because of their special onion-like structure. The candle soot particles (CSP) are modified by 1H,1H,2H,2H-perfluorooctanol (CSP-PFHE nanoparticles), and after the fluorination, they exhibit good dispersivity in PFPE. The mixtures composed of CSP-PFHE nanoparticles and PFPE possess better tribological performance than neat PFPE under different test conditions including variable temperature, the irradiation of atomic oxygen and extreme pressure. The reason can be attributed to that the graphene layers are exfoliated from the surfaces of nanoparticles and adhere onto the steel surfaces to form the tribofilm, which can protect the sliding pairs surfaces from friction and severe wear. Meanwhile, the redundant nanoparticles act as the rolling bearing between the sliding surfaces to decrease the wear and some are packed into the corrosion pits generated by PFPE to prevent further erosion in the process of friction. At the end, the lubricating mechanism of CSP-PFHE nanoparticles as Additives of PFPE is proposed based on the test results of scanning electron microscope, contact electrical resistance and X-ray photoelectron spectroscopy.Graphical Abstract
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ionic liquid modified multi walled carbon nanotubes as Lubricant Additive
Tribology International, 2015Co-Authors: Bo Yu, Feng ZhouAbstract:Abstract Multi-walled carbon nanotubes (MWCNTs) were modified by imidazolium-based ionic liquid (IL), 1-hydroxyethyl-3-hexyl imidazolium tetrafluoroborate and used as an Additive in base stock IL 1-methyl-3-butylimidazolium tetrafluoroborate as the base Lubricant. The effectiveness of using the IL- modified MWCNTs as Lubricant Additive was evaluated using a ball-on-plate configuration on an Optimol SRV oscillating friction and wear tester. The worn surfaces were examined using scanning electron microscope and the chemical composition on wear tracks was analyzed on an X-ray photoelectron spectrometer. Results suggest excellent anti-wear properties for the IL-modified MWCNTs as Lubricant Additive.
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A novel Lubricant Additive based on carbon nanotubes for ionic liquids
Materials Letters, 2008Co-Authors: Bo Yu, Feng Zhou, Yongmin LiangAbstract:Abstract Room Temperature Ionic Liquid (RTIL)/Multi-Walled Carbon Nanotubes (MWNTs) composite was prepared by chemical modification. The composite was analyzed by using laser Raman spectroscopy and X-ray photoelectron spectroscopy. The RTIL/MWNTs composite was evaluated as Lubricant Additive in ionic liquid due to their excellent dispersibility. Tribological performances of RTIL/MWNTs composite as Lubricant Additive were performed on a universal UMT-2MT Tribo-tester. It is found that RTIL/MWNTs composite showed good friction-reduction and anti-wear properties in friction process. It is concluded that RTIL/MWNTs composite might play the role of roller bearing during friction process.
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A novel Lubricant Additive based on carbon nanotubes for ionic liquids
Materials Letters, 2008Co-Authors: Bo Yu, Zhilu Liu, Wei-min Liu, Feng Zhou, Yongmin LiangAbstract:Room Temperature Ionic Liquid (RTIL)/Multi-Walled Carbon Nanotubes (MWNTs) composite was prepared by chemical modification. The composite was analyzed by using laser Raman spectroscopy and X-ray photoelectron spectroscopy. The RTIL/MWNTs composite was evaluated as Lubricant Additive in ionic liquid due to their excellent dispersibility. Tribological performances of RTIL/MWNTs composite as Lubricant Additive were performed on a universal UMT-2MT Tribo-tester. It is found that RTIL/MWNTs composite showed good friction-reduction and anti-wear properties in friction process. It is concluded that RTIL/MWNTs composite might play the role of roller bearing during friction process. © 2008 Elsevier B.V. All rights reserved.
Shengmao Zhang - One of the best experts on this subject based on the ideXlab platform.
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Tribological characteristic and mechanism analysis of borate ester as a Lubricant Additive in different base oils
RSC Advances, 2020Co-Authors: Guangbin Yang, Shengmao Zhang, Laigui Yu, Shiyong Song, Junhua Zhao, Pingyu ZhangAbstract:A kind of N-containing borate ester (DEBE) with a double five-member-ring structure as a Lubricant Additive was synthesized by using boric acid, diethanolamine and alkylphenol polyoxyethylene ether as the starting materials. The tribological performance of the as-prepared DEBE was evaluated using a four-ball friction and wear tester in different base oils, such as liquid paraffin (LP), poly-alpha-olefin (PAO) and dioctyl sebacate (DIOS), while the morphologies of the worn scars of the steel balls were observed using a scanning electron microscope. The chemical components on the worn surfaces of the steel balls were analyzed using X-ray photoelectron spectroscopy. The tribological mechanisms in base oils of LP, PAO and DIOS were also explored. The results show that as-prepared borate ester DEBE possessed good antiwear properties in LP and PAO and can be used as a promising S- and P-free environmentally acceptable lubricating oil Additive. However, the antiwear ability decreased when the Additive DEBE was added to DIOS base oil. The antiwear ability of the DEBE borate esters used as an Additive in DIOS might be closely related to competitive adsorption between DEBE borate ester and DIOS ester oil. Namely, compared with the DEBE Additive, the DIOS base oil is first to adsorb to the metal surface because of the higher polarity. Moreover, a small amount of the Additive absorbed on the metal surface may influence the continuity and compactness of the oil film formed by DIOS alone, resulting in destruction of the tribological properties of DIOS.
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tribological properties of oleic acid modified zinc oxide nanoparticles as the Lubricant Additive in poly alpha olefin and diisooctyl sebacate base oils
RSC Advances, 2016Co-Authors: Lili Wu, Shengmao Zhang, Laigui Yu, Guangbin Yang, Yujuan Zhang, Pingyu ZhangAbstract:Oleic acid (OA) modified ZnO nanoparticles with an average size of 4.04 nm were prepared via a facile in situ one-step route. The as-prepared ZnO nanoparticles were characterized by X-ray diffraction, transmission electron microscopy, and Fourier transform infrared spectroscopy. The light-absorbing performance and thermal stability of the as-prepared ZnO nanoparticles were evaluated by ultraviolet-visible light spectrophotometry and thermogravimetric analysis, and their tribological behaviour as the Lubricant Additive in poly-alpha olefin (PAO) and diisooctyl sebacate (DIOS) base oils was evaluated with a four-ball machine. The surface morphology of the wear scar was observed with a scanning electron microscope and a three-dimensional optical profiler, and the element composition of the wear scar was determined by energy dispersive spectrometry. It was found that the surface-capping of ZnO nanoparticles by OA helps to greatly increase their dispersibility and thermal stability. In the meantime, OA-modified ZnO nanoparticles can effectively improve the antiwear and friction-reducing abilities as well as the load-carrying capacity of the base oils, which is due to the formation of a tribofilm in association with the tribo-sintering and/or adsorption of the Additives on the rubbed steel surfaces. Furthermore, the friction-reducing and antiwear performances of the as-prepared ZnO nanoparticles as lubricating oil Additives seem to be closely related to the polarity of the base oils. Namely, the OA-modified ZnO Additive exhibits better tribological behaviour in apolar PAO than in polar DIOS.
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preparation and tribological properties of surface capped copper nanoparticle as a water based Lubricant Additive
Tribology Letters, 2014Co-Authors: Chunli Zhang, Shengmao Zhang, Laigui Yu, Zhishen Wu, Shiyong Song, Guangbin Yang, Xiaohong Li, Pingyu ZhangAbstract:Cu nanoparticle surface-capped by methoxylpolyethyleneglycol xanthate was synthesized using in situ surface-modification technique. The size, morphology and phase structure of as-prepared Cu nanoparticle were analyzed by means of X-ray diffraction and transmission electron microscopy. The tribological properties of as-synthesized Cu nanoparticle as an Additive in distilled water were investigated with a four-ball machine, and the morphology and elemental composition of worn steel surfaces were examined using X-ray photoelectron spectroscopy and scanning electron microscope equipped with an energy-dispersive spectrometer attachment. Results show that as-synthesized Cu nanoparticle as a water-based Lubricant Additive is able to significantly improve the tribological properties and load-carrying capacity of distilled water, which is ascribed to the deposition of Cu nanoparticles on steel sliding surfaces giving rise to a protective and lubricious Cu layer thereon. In the meantime, they may also tribochemically react with rubbing steel surfaces to generate a boundary lubricating film consisting of Cu, FeS and FeSO4 on the rubbed steel surface, which helps to result in greatly improved tribological properties of distilled water, thereby reducing friction and wear of the steel–steel pair.
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Preparation and tribological properties of water-soluble copper/silica nanocomposite as a water-based Lubricant Additive
Applied Surface Science, 2012Co-Authors: Chunli Zhang, Shengmao Zhang, Laigui Yu, Zhijun Zhang, Zhishen Wu, Pingyu ZhangAbstract:Abstract Cu/SiO 2 nanocomposite was synthesized by sol–gel method. The size, morphology and phase structure of as-prepared Cu/SiO 2 nanocomposite were analyzed by means of X-ray diffraction and transmission electron microscopy, and its ultraviolet-visible light spectrum was measured in relation to surface plasmon excitation of Cu particles. The tribological properties of as-synthesized Cu/SiO 2 nanocomposite as an Additive in distilled water were investigated with a four-ball machine, and the morphology and elemental composition of worn steel surfaces were examined with a scanning electron microscope and an X-ray photoelectron spectroscope. Results show that as-synthesized Cu/SiO 2 nanocomposite as a Lubricant Additive is able to significantly improve the tribological properties of distilled water. A protective and lubricious film composed of Cu and a small amount of FeS, FeSO 4 and SiO 2 is formed on steel sliding surfaces lubricated by distilled water containing Cu/SiO 2 nanocomposite. During friction process Cu nanoparticles can be released from Cu/SiO 2 nanocomposite to fill up micro-pits and grooves of steel sliding surfaces, resulting in greatly reduced friction and wear of steel frictional pair via self-repairing. The state and thickness of the film formed on the worn surface is closely related to applied load; and Cu/SiO 2 nanocomposite might be a promising water-based Lubricant Additive for steel-steel contact subjected to moderate load.
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preparation and tribological properties of water soluble copper silica nanocomposite as a water based Lubricant Additive
Applied Surface Science, 2012Co-Authors: Chunli Zhang, Shengmao Zhang, Laigui Yu, Zhijun Zhang, Zhishen Wu, Pingyu ZhangAbstract:Abstract Cu/SiO 2 nanocomposite was synthesized by sol–gel method. The size, morphology and phase structure of as-prepared Cu/SiO 2 nanocomposite were analyzed by means of X-ray diffraction and transmission electron microscopy, and its ultraviolet-visible light spectrum was measured in relation to surface plasmon excitation of Cu particles. The tribological properties of as-synthesized Cu/SiO 2 nanocomposite as an Additive in distilled water were investigated with a four-ball machine, and the morphology and elemental composition of worn steel surfaces were examined with a scanning electron microscope and an X-ray photoelectron spectroscope. Results show that as-synthesized Cu/SiO 2 nanocomposite as a Lubricant Additive is able to significantly improve the tribological properties of distilled water. A protective and lubricious film composed of Cu and a small amount of FeS, FeSO 4 and SiO 2 is formed on steel sliding surfaces lubricated by distilled water containing Cu/SiO 2 nanocomposite. During friction process Cu nanoparticles can be released from Cu/SiO 2 nanocomposite to fill up micro-pits and grooves of steel sliding surfaces, resulting in greatly reduced friction and wear of steel frictional pair via self-repairing. The state and thickness of the film formed on the worn surface is closely related to applied load; and Cu/SiO 2 nanocomposite might be a promising water-based Lubricant Additive for steel-steel contact subjected to moderate load.
