石墨烯修饰的多孔聚酰亚胺的制备及其摩擦学特性

IF 1.5 4区工程技术 Q3 ENGINEERING, MECHANICAL Industrial Lubrication and Tribology Pub Date : 2024-05-06 DOI:10.1108/ilt-12-2023-0415

Ting Li, Junmiao Wu, Junhai Wang, Yunwu Yu, Xinran Li, Xiaoyi Wei, Lixiu Zhang

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引用次数: 0

摘要

目的本文旨在制备可用作轴承保持架材料的石墨烯/聚酰亚胺复合材料，以改善轴承保持架的摩擦和磨损性能。对摩擦学行为和磨损机制的研究包括对基于 PPI 的材料的磨损痕迹形态进行表征和分析。结果由于 PPI-GN 复合材料的孔隙率增加，复合材料表现出优异的含油性能。GN 和 PPI 之间共价键的牢固形成增强了 PPI-GN 复合材料的粘合力，从而大大提高了冲击强度。值得注意的是，与 PPI 相比，PPI-GN 复合材料显示出更强的润滑性能，这一点在 GN 含量为 0.5 Wt.% 时尤为明显，这体现在平均摩擦系数和磨痕宽度的最小化上。原创性/价值本文通过原位聚合将 GN 引入聚酰亚胺基体中，有效合成了均匀分散的 PPI-GN 复合材料，并比较了 PPI 复合材料与 PPI-GN 复合材料的润滑机理，从而说明了复合材料的优越性。同行评审本文的同行评审历史可在以下网站查阅：https://publons.com/publon/10.1108/ILT-12-2023-0415。

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Preparation and tribological properties of porous polyimide modified by graphene

Purpose

The purpose of this article is to prepare graphene/polyimide composite materials for use as bearing cage materials, improving the friction and wear performance of bearing cages.

Design/methodology/approach

The oil absorption and discharge tests were conducted to evaluate the oil content properties of the materials, while the mechanical properties were analyzed through cross-sectional morphology examination. Investigation into the tribological behavior and wear mechanisms encompassed characterization and analysis of wear trace morphology in PPI-based materials. Consequently, the influence of varied graphene nanoplatelets (GN) concentrations on the oil content, mechanical and tribological properties of PPI-based materials was elucidated.

Findings

The composites exhibit excellent oil-containing properties due to the increased porosity of PPI-GN composites. The robust formation of covalent bonds between GN and PPI amplifies the adhesive potency of the PPI-GN composites, thereby inducing a substantial enhancement in impact strength. Notably, the PPI-GN composites showed enhanced lubrication properties compared to PPI, which was particularly evident at a GN content of 0.5 Wt.%, as evidenced by the minimization of the average coefficient of friction and the width of the abrasion marks.

Practical implications

This paper includes implications for elucidating the wear mechanism of the polyimide composites under frictional wear conditions and then to guide the optimization of oil content and tribological properties of polyimide bearing cage materials.

Originality/value

In this paper, homogeneously dispersed PPI-GN composites were effectively synthesized by introducing GN into a polyimide matrix through in situ polymerization, and the lubrication mechanism of the PPI composites was compared with that of the PPI-GN composites to illustrate the composites’ superiority.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-12-2023-0415

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来源期刊

Industrial Lubrication and Tribology 工程技术-工程：机械

CiteScore

3.00

自引率

18.80%

发文量

129

审稿时长

1.9 months

期刊介绍： Industrial Lubrication and Tribology provides a broad coverage of the materials and techniques employed in tribology. It contains a firm technical news element which brings together and promotes best practice in the three disciplines of tribology, which comprise lubrication, wear and friction. ILT also follows the progress of research into advanced lubricants, bearings, seals, gears and related machinery parts, as well as materials selection. A double-blind peer review process involving the editor and other subject experts ensures the content''s validity and relevance.