Influence of pore structures on friction and wear properties of iron-based oil-containing composites under dry and self-lubricated sliding conditions

IF 5.3 1区 工程技术 Q1 ENGINEERING, MECHANICAL
Wear Pub Date : 2024-08-05 DOI:10.1016/j.wear.2024.205533
Rongrong Li , Yanguo Yin , Jilin Miao , Xiaoliang Fang , Congmin Li , Ming Xu
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Abstract

This study successfully prepares iron-based oil-containing materials with connected porous structures using TiH2 and nylon 66 short fibers as pore-forming agents. The dehydrogenation of TiH2 can produce large pore cavities and the nylon 66 short fiber with a highly regular shape has a unique advantage in pore channel production. Compared to the iron-based specimen without the pore-forming agent, the oil content of the iron-based specimen with the two pore-forming agents increases by 33.86 %. The tribologica23ee3l properties of the iron-based oil-containing materials under dry and self-lubricated sliding conditions are evaluated using the MM-200 ring-block sliding tribometer and the HDM-20 end-face friction and wear tester, respectively. Special emphasis is given to the effect of pore structures on wear patterns. The results showed that the material's surface is subjected to significant shear failure under dry sliding conditions, leading to the closure of pores due to plastic deformation during the initial sliding. The connected pore structure is a non-dense region, allowing shear damage to occur in the deeper subsurface of the matrix and increasing the material's wear rate. Under self-lubricated conditions, the connected pore structure facilitates the rapid release of lubricating oil, improves the initial lubrication state, and delays pore closure. As compared with dry friction, the wear rate can be reduced by two orders of magnitude under self-lubricating conditions. At a sliding speed of 0.46 m/s, an appropriate load (about 900 N) can enhance the material's ability to continuously and rapidly supply oil.

孔隙结构对含铁油基复合材料在干燥和自润滑滑动条件下的摩擦和磨损特性的影响
本研究以 TiH 和尼龙 66 短纤维为孔隙形成剂,成功制备了具有连通多孔结构的铁基含油材料。TiH 的脱氢作用可产生大孔腔,而尼龙 66 短纤维具有高度规则的形状,在孔道生成方面具有独特的优势。与未添加成孔剂的铁基试样相比,添加了两种成孔剂的铁基试样的含油量增加了 33.86%。分别使用 MM-200 环块滑动摩擦仪和 HDM-20 端面摩擦磨损测试仪评估了含油铁基材料在干燥和自润滑滑动条件下的摩擦学23ee3l 特性。特别强调了孔隙结构对磨损模式的影响。结果表明,在干滑动条件下,材料表面会受到明显的剪切破坏,导致孔隙在初始滑动过程中因塑性变形而闭合。连通的孔隙结构是一个非致密区域,使得剪切破坏发生在基体更深的地下,增加了材料的磨损率。在自润滑条件下,连通孔隙结构有利于润滑油的快速释放,改善初始润滑状态,延迟孔隙关闭。与干摩擦相比,自润滑条件下的磨损率可降低两个数量级。在 0.46 米/秒的滑动速度下,适当的负载(约 900 牛顿)可增强材料持续快速供油的能力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Wear
Wear 工程技术-材料科学:综合
CiteScore
8.80
自引率
8.00%
发文量
280
审稿时长
47 days
期刊介绍: Wear journal is dedicated to the advancement of basic and applied knowledge concerning the nature of wear of materials. Broadly, topics of interest range from development of fundamental understanding of the mechanisms of wear to innovative solutions to practical engineering problems. Authors of experimental studies are expected to comment on the repeatability of the data, and whenever possible, conduct multiple measurements under similar testing conditions. Further, Wear embraces the highest standards of professional ethics, and the detection of matching content, either in written or graphical form, from other publications by the current authors or by others, may result in rejection.
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