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Tribological and antioxidation synergistic effect study of sulfonate-modified nano calcium carbonate.

Zhongyi H, Liping X, Sheng H, Aixi C, Jianwei Q, Xisheng F - PLoS ONE (2013)

Bottom Line: The results demonstrate that adding this synthesized additive even at a low amount (<2.0 wt.%) can evidently improve its load-carrying capacity by 1.5 times and enhance its antiwear performance; in addition, the friction-reducing effect of additive in the high load was better than that in low load.The SMC have a good synergistic antioxidation effect with T531, which verifies the nano calcium carbonate compound was a kind of multifunctional and high-performance additive.The results indicating that the excellent antiwear and load-carrying performance could be attributed to the forming of boundary lubrication film which composed of calcium carbonate, oxides, ferrites, sulphide and FeSO4, and so on.

View Article: PubMed Central - PubMed

Affiliation: School of Basic Science, East China Jiaotong University, Nanchang, PR China. zhongyihe@yahoo.com.cn

ABSTRACT
A middle base number sulphonate-modified nano calcium carbonate (SMC) with an average size of 35 nm was synthesized, and its tribological and antioxidation synergistic behaviors with ashless antioxidant N-phenyl-α-naphthylamine (T531) in hydrogenated oil (5Cst) were evaluated. The results demonstrate that adding this synthesized additive even at a low amount (<2.0 wt.%) can evidently improve its load-carrying capacity by 1.5 times and enhance its antiwear performance; in addition, the friction-reducing effect of additive in the high load was better than that in low load. The SMC have a good synergistic antioxidation effect with T531, which verifies the nano calcium carbonate compound was a kind of multifunctional and high-performance additive. The chemical composition of the rubbing surface which formed on the boundary film was analyzed by using scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results indicating that the excellent antiwear and load-carrying performance could be attributed to the forming of boundary lubrication film which composed of calcium carbonate, oxides, ferrites, sulphide and FeSO4, and so on. Its ability to increase oxidation free energy of base oil is the main reason for increasing its antioxidant collaboration property with ashless antioxidant T531.

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Related in: MedlinePlus

SEM morphologies of wear scar of steel balls lubricated by a 5Cst(a) and b 1.0 wt% SMC/5Cst(b) at 392N for 30 min.
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pone-0062050-g005: SEM morphologies of wear scar of steel balls lubricated by a 5Cst(a) and b 1.0 wt% SMC/5Cst(b) at 392N for 30 min.

Mentions: In order to understand the boundary lubricating mechanism, the worn surface of steel ball was studied by SEM. Figure 5 gives the typical SEM images of the worn steel ball surface lubricated by 5Cst and the 5Cst containing 1.0 wt% SMC at 392 N for 30 min. It can be seen that the surface lubricated by 5Cst alone is rough and shows signs of severe scuffing (Figure 5a), taking on grain abrasion characteristic. On the other hand, scuffing on the surface of the tested steel ball lubricated by 5Cst containing 1.0 wt% SMC was significantly inhibited (Figure 5b). Moreover, the wear scar of the steel ball lubricated by 5Cst containing 1.0 wt% SMC is much smaller and smoother than that lubricated by 5Cst alone. Therefore, the results further testify that SMC has good anti-wear property.


Tribological and antioxidation synergistic effect study of sulfonate-modified nano calcium carbonate.

Zhongyi H, Liping X, Sheng H, Aixi C, Jianwei Q, Xisheng F - PLoS ONE (2013)

SEM morphologies of wear scar of steel balls lubricated by a 5Cst(a) and b 1.0 wt% SMC/5Cst(b) at 392N for 30 min.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3643949&req=5

pone-0062050-g005: SEM morphologies of wear scar of steel balls lubricated by a 5Cst(a) and b 1.0 wt% SMC/5Cst(b) at 392N for 30 min.
Mentions: In order to understand the boundary lubricating mechanism, the worn surface of steel ball was studied by SEM. Figure 5 gives the typical SEM images of the worn steel ball surface lubricated by 5Cst and the 5Cst containing 1.0 wt% SMC at 392 N for 30 min. It can be seen that the surface lubricated by 5Cst alone is rough and shows signs of severe scuffing (Figure 5a), taking on grain abrasion characteristic. On the other hand, scuffing on the surface of the tested steel ball lubricated by 5Cst containing 1.0 wt% SMC was significantly inhibited (Figure 5b). Moreover, the wear scar of the steel ball lubricated by 5Cst containing 1.0 wt% SMC is much smaller and smoother than that lubricated by 5Cst alone. Therefore, the results further testify that SMC has good anti-wear property.

Bottom Line: The results demonstrate that adding this synthesized additive even at a low amount (<2.0 wt.%) can evidently improve its load-carrying capacity by 1.5 times and enhance its antiwear performance; in addition, the friction-reducing effect of additive in the high load was better than that in low load.The SMC have a good synergistic antioxidation effect with T531, which verifies the nano calcium carbonate compound was a kind of multifunctional and high-performance additive.The results indicating that the excellent antiwear and load-carrying performance could be attributed to the forming of boundary lubrication film which composed of calcium carbonate, oxides, ferrites, sulphide and FeSO4, and so on.

View Article: PubMed Central - PubMed

Affiliation: School of Basic Science, East China Jiaotong University, Nanchang, PR China. zhongyihe@yahoo.com.cn

ABSTRACT
A middle base number sulphonate-modified nano calcium carbonate (SMC) with an average size of 35 nm was synthesized, and its tribological and antioxidation synergistic behaviors with ashless antioxidant N-phenyl-α-naphthylamine (T531) in hydrogenated oil (5Cst) were evaluated. The results demonstrate that adding this synthesized additive even at a low amount (<2.0 wt.%) can evidently improve its load-carrying capacity by 1.5 times and enhance its antiwear performance; in addition, the friction-reducing effect of additive in the high load was better than that in low load. The SMC have a good synergistic antioxidation effect with T531, which verifies the nano calcium carbonate compound was a kind of multifunctional and high-performance additive. The chemical composition of the rubbing surface which formed on the boundary film was analyzed by using scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results indicating that the excellent antiwear and load-carrying performance could be attributed to the forming of boundary lubrication film which composed of calcium carbonate, oxides, ferrites, sulphide and FeSO4, and so on. Its ability to increase oxidation free energy of base oil is the main reason for increasing its antioxidant collaboration property with ashless antioxidant T531.

Show MeSH
Related in: MedlinePlus