Friction reduction behavior of oil-infused natural wood

材料科学 多孔性 摩擦学 乳状液 浮力 复合材料 合成油 多孔介质 化学工程 工程类 基础油 扫描电子显微镜 物理 量子力学
作者
Shutian Liu,Conglin Dong,Chengqing Yuan,Xiuqin Bai
出处
期刊:Friction [Springer Nature]
卷期号:10 (11): 1824-1837 被引量:9
标识
DOI:10.1007/s40544-021-0558-5
摘要

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.
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