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Influence of Load and Sliding Speed on Super-Low Friction of Nitinol 60 Alloy under Castor Oil Lubrication

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Abstract

In the present paper, the influence of load and sliding speed on super-low friction of Nitinol 60 alloy was investigated experimentally using Nitinol 60 alloy pin sliding over GCr15 steel disk under castor oil lubrication. Super-low coefficient of friction (COF) of Nitinol 60 alloy was achieved at the stable state, corresponding to so-called superlubricity regime in the presence of castor oil. The experimental results indicate that sliding speed employed in the friction tests plays great roles in the lubrication behaviors of Nitinol 60 alloy. When the friction tests are executed from low sliding speed to high sliding speed, COF decreases at the initial stage and on the contrary, COF increases at the stable stage. However, with the increase in load, COF firstly increases and then decreases at the initial stage. COF is unstable but still super low and remains almost the same value at the stable stage. These phenomena are explained and discussed in viewpoint of the characteristics of castor oil during the friction tests. It is found that the influence of sliding speed on the lubrication behaviors of Nitinol 60 alloy under castor oil lubrication is more obvious than that of load due to the characteristics structure of castor oil, therefore maintaining appropriate level of sliding speed to achieve super-low friction of Nitinol 60 alloy.

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Acknowledgments

The present work is financially supported by the grant from National Natural Science Foundation of China (51175406) and China Postdoctoral Science Foundation (2012M511993) and Project (TPL1202) supported by the Open Fund Program of the State Key Laboratory of Traction Power, Southwest Jiaotong University.

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  1. Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, Xi’an Jiaotong University, Xi’an, 710049, China

    Qunfeng Zeng & Guangneng Dong

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  1. Qunfeng Zeng
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  2. Guangneng Dong
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Correspondence to Qunfeng Zeng.

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Zeng, Q., Dong, G. Influence of Load and Sliding Speed on Super-Low Friction of Nitinol 60 Alloy under Castor Oil Lubrication. Tribol Lett 52, 47–55 (2013). https://doi.org/10.1007/s11249-013-0191-1

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