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Chinese Journal of Materials Research  2016, Vol. 30 Issue (1): 57-62    DOI: 10.11901/1005.3093.2015.082
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Tribological Properties of Graphene as Effective Lubricant Additive in Oil on Textured Bronze Surface
ZHAO Lei, CAI Zhenbing**(), ZHANG Zuchuan, ZHANG Xu, LIN Yingwu, PENG Jinfang, ZHU Minhao
Tribology Research Institute, Southwest Jiaotong University, Chengdu 610031, China
Cite this article: 

ZHAO Lei, CAI Zhenbing, ZHANG Zuchuan, ZHANG Xu, LIN Yingwu, PENG Jinfang, ZHU Minhao. Tribological Properties of Graphene as Effective Lubricant Additive in Oil on Textured Bronze Surface. Chinese Journal of Materials Research, 2016, 30(1): 57-62.

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Abstract  

The friction and wear properties of graphene (GP) as a lubricant additives were investigated by means of a UTM-2 tribometer via a ball on plate contact reciprocating sliding. The molecular structure and morphology of graphene nano sheets were characterized by TEM, SEM, XRD, IR and Raman spectroscopy. The friction and wear test was performed with lubricant of PAO4 oil without and with addition of 0.01% graphene (GP) respectively at different temperatures for the textured bronze with different ratio of textured area. The results show that GP can effectively reduce the friction and wear, especially at 60℃ and 100℃. For the simple PAO4 oil, the bronze with untextured surface exhibits the lowest friction coefficient and wear rate at 60℃ and 100℃; whilst, with the increasing ratio of the textured area, the friction coefficient and wear rate increase. For graphene-containing PAO4 lubricating oil, the friction coefficient is lower for the bronze with 5% textured area, while higher for those with 20%; the wear rate is lower for the bronze with 10% textured area.

Key words:  inorganic non-metallic materials      graphene      additive      texture      friction and wear     
Received:  10 February 2015     
Fund: *Supported by National Natural Science Foundation of China Nos.51375407 & U1530136
About author:  **To whom correspondence should be addressed, Tel: (028)87600601, E-mail: czb-jiaoda@126.com

URL: 

https://www.cjmr.org/EN/10.11901/1005.3093.2015.082     OR     https://www.cjmr.org/EN/Y2016/V30/I1/57

Parameter Sample No.
0# 1# 2# 3#
Long axis of the ellipse-a /μm 0 200 200 200
Short axis of the ellipse-b /μm 0 100 100 100
Vertical distance-Y /μm 0 300 300 300
Horizontal distance /μm 0 523.6 261.8 130.9
Depth /μm 0 20 20 20
Area ratio 0 5% 10% 20%
Table1  Geometric parameters of the texture
Fig.1  Optical images of dispersion property of the grapheme in oil ①-PAO4+0.05%GP, ②-PAO4+0.05%GP+1%SP, ③-PAO4+0.01%GP, ④-PAO4+0.01%GP+1%SP, ⑤-PAO4
Fig.2  Friction coefficient under varied temperatures for 2# sample
Fig.3  Cross-section profiles of the worn scar for 2# sample under varied test temperatures, (a) 25℃, (b) 60℃, (c) 100℃, (d) 150℃
Fig.4  Morphology of the worn scars on balls and plates for 2# sample at 60℃
Fig.5  SEM images and EDS patterns of worn surface for 2# sample at 60℃
Fig.6  Comparison of average friction coefficient of different textured surface
Sample 25℃ 60℃ 100℃ 150℃
PAO +0.01%GP PAO +0.01%GP PAO +0.01%GP PAO +0.01%GP
0# 39.8 38.1 137.2 40.4 164.4 43.7 65.3 60.7
1# 59.6 31.5 385.3 35.4 387.6 37.2 64.6 61.3
2# 53.3 21.3 394.6 19.04 425.3 24.9 41.9 14.3
3# 46.3 52.1 525.2 55.0 355.9 62.5 56.4 57.5
Table 2  Wear rate of the worn plate (μm3/Nmm)
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