@article{LIU2022, 
author = {Shutian LIU and Conglin DONG and Chengqing YUAN and Xiuqin BAI},
title = {Friction reduction behavior of oil-infused natural wood},
year = {2022},
journal = {Friction},
volume = {10},
number = {11},
pages = {1824-1837},
keywords = {natural porous material, oil infusion treatment, fluorination, frictional behaviors},
url = {https://www.sciopen.com/article/10.1007/s40544-021-0558-5},
doi = {10.1007/s40544-021-0558-5},
abstract = {Natural materials tend to exhibit excellent performance in the engineering field because of their structure and special functions. A natural red willow, called natural porous wood material (NPWM), was found, and wear tests were conducted to determine its potential as an oil-impregnated material by utilizing its special porous structure. Fluorination treatment was adopted to improve the NPWM properties for absorbing and storing lubricating oil. The different contributions of soaking and fluorination-soaking treatments on the tribological properties of NPWMs and their respective mechanism of effect were revealed. The results showed that the fluorination-soaking treatment helped absorb and store sufficient lubricating oil in the NPWM porous structure; therefore, more lubricating oil would be squeezed out and function as a tribol-film between contacting surfaces during the friction process, thus ultimately contributing to stable and smooth wear responses even under prolong friction. However, the formation of an oil-in-water emulsion, caused by the buoyancy effect, destroyed the oil films on the worn NPWM surface in a water environment, resulting in higher coefficients of friction (COFs) under water conditions than under dry friction, even after the fluorination-soaking treatment. The knowledge gained herein could not only verify the potential of NPWM as an excellent oil-impregnated material in the engineering field but also provide a new methodology for the design of artificial porous materials with stable and smooth friction processes.}
}