Technical Brief

Tribological Properties of the Castor Oil Affected by the Additive of the Ionic Liquid [HMIM]BF4

[+] Author and Article Information
Qian Shanhua, Chen Xuliang, Liu Liguo, Li Qingzhong

School of Mechanical Engineering,
Jiangnan University,
Wuxi, Jiangsu 214122, China

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received February 5, 2015; final manuscript received July 8, 2015; published online August 14, 2015. Assoc. Editor: Dae-Eun Kim.

J. Tribol 138(1), 014501 (Aug 14, 2015) (5 pages) Paper No: TRIB-15-1043; doi: 10.1115/1.4031081 History: Received February 05, 2015

The influence of the ionic liquid used as the additive on the tribological properties of castor oil is investigated using a four-ball test rig. The additive percentages of ionic liquid in castor oil are 0.6 wt.%, 1 wt.%, 2 wt.%, and 3 wt.%. The test results show that a small amount of ionic liquid can postpone the peak coefficient of friction and decrease the wear behavior of castor oil. The minimum of the wear scar diameter (WSD) occurs at 1 wt.% ionic liquid. It seems that the chemical adsorption of castor oil and ionic liquid on the steel surface is more significant than the physical adsorption. This study should be of great importance of understanding the potential engineering application of castor oil.

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Fig. 1

Variation in the coefficient of friction with time at various additives

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Fig. 2

Variation in the peak coefficient of friction and its time with the additive percentage

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Fig. 3

Variation in WSD and contact pressure with [HMIM]BF4 percentage

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Fig. 4

Variation in the local worn surface with [HMIM]BF4 percentage: (a) at lower magnification and (b) at larger magnification

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Fig. 5

Variation in the viscosity of mixed castor oils with temperatures

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Fig. 7

Element distribution of ball surface at 1 wt.% [HMIM]BF4

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Fig. 6

Variation in oil pool temperature with time for pure castor oil




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