硅酸盐学报

叶蛇纹石和硅灰石对聚四氟乙烯摩擦磨损行为的影响

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王晨 ¹^,² , 白志民 ¹ , 于鹤龙 ² , 尹艳丽 ² , 宋占永 ² , 王申 ¹^,² , 杨喆 ²^,³

硅酸盐学报 | 研究论文 2024,52(6): 2081-2093

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硅酸盐学报 |研究论文 2024 , 52 (6) : 2081 -2093

叶蛇纹石和硅灰石对聚四氟乙烯摩擦磨损行为的影响

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王晨¹^,², 白志民¹, 于鹤龙², 尹艳丽², 宋占永², 王申¹^,², 杨喆²^,³

作者信息

^1．中国地质大学（北京）材料科学与工程学院，北京 100083

^2．陆军装甲兵学院再制造技术国家级重点实验室，北京 100072

^3．西安理工大学印刷包装与数字媒体学院，西安 710048

通讯作者:

于鹤龙（1979—），男，博士，副研究员。

作者简介:

王晨（2000—），男，硕士研究生。

Influences of Antigorite and Wollastonite on Friction and Wear Behaviors of Polytetrafluoroethylene

Chen WANG¹^,², Zhimin BAI¹, Helong YU², Yanli YIN², Zhanyong SONG², Shen WANG¹^,², Zhe YANG²^,³

Affiliations

^1.School of Materials Science and Engineering, China University of Geosciences, Beijing 100083, China

^2.National Key Lab for Remanufacturing, Army Academy of Armored Forces, Beijing 100072, China

^3.School of Printing, Packaging and Digital Media, Xi'an University of Technology, Xi'an 710048, China

Corresponding Author:

YU Helong (1979-), male, Ph.D., Associate Professor. E-mail: helong.yu@163.com

WANG Chen (2000-), male, Master candidate. E-mail: 2103210003@email.cugb.edu

出版时间: 2024-06-20 doi: 10.14062/j.issn.0454-5648.20230711

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摘要

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将层状硅酸盐矿物引入聚合物以改善其摩擦学性能的研究，为发展智能自修复型复合材料提供了新思路。将叶蛇纹石和硅灰石粉体作为填料引入聚四氟乙烯（PTFE），通过球磨混合-冷压成型-无压烧结的方式制备得到不同成分的矿物增强PTFE基复合材料。研究了复合材料物相结构、微观形貌与成分、邵氏硬度和干摩擦条件下的摩擦磨损行为，讨论了叶蛇纹石和硅灰石粉体对PTFE/高碳铬轴承钢摩擦副的减摩抗磨协同机制。结果表明：得益于矿物对PTFE的强化作用和对偶表面兼具高硬度和自润滑特性的摩擦反应膜的形成，复合材料表现出优异的摩擦学性能；与添加单一叶蛇纹石相比，硅灰石矿物的添加降低了叶蛇纹石的相变温度，促进了摩擦反应膜的形成，对改善复合材料的摩擦学性能具有良好的协同作用；同时添加10%（质量分数）叶蛇纹石和20%（质量分数）硅灰石的PTFE基复合材料平均摩擦系数和磨损体积较纯PTFE分别降低44.2%和71.4%。

关键词

叶蛇纹石 / 硅灰石 / 聚四氟乙烯 / 摩擦反应膜 / 摩擦磨损

Abstract

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Introduction

Studies on introducing phyllosilicate minerals into polymers to improve their tribological properties can provide some ideas for the development of intelligent self-healing composite materials. Polytetrafluoroethylene (PTFE) is widely used as one of engineering materials and solid lubricating materials due to its good self-lubricating ability, thermal stability, corrosion resistance and machinability. However, the molecular bond structure of PTFE exhibits unique slip characteristics during crystallization, making it prone to creep and resulting in a poor wear resistance. It is thus necessary for the modification of PTFE to improve the mechanical properties and tribological performance for engineering applications. The modification methods mainly include surface modification, blending modification, and filling modification. Recent studies indicate that the introduction of minerals such as serpentine, attapulgite, and sepiolite into PTFE can obtain PTFE-based composites with uniform mineral dispersion and excellent thermal stability, mechanical properties, and tribological properties due to the property of phyllosilicate minerals to intercalate monomer or polymer molecules. In this paper, antigorite and wollastonite minerals reinforced PTFE-based composites were prepared. The tribological properties of the composites were investigated, and the mechanism of the tribological properties improvement of PTFE caused by antigorite and wollastonite was discussed based on the worn surface analysis.

Methods

Antigorite (Atg) was extracted from natural deposited serpentine mineral in Anshan, China. Wollastonite (Wl) was provided by Dalian Global Mineral Co., Ltd., China. Polytetrafluoroethylene (PTFE) was purchased from Shandong Dongyue Co., China. The phase structure, functional groups and thermodynamic behaviors of the mixed raw powders were characterized by a model D8 Advance X-ray diffractometer (XRD), a model Nicolet 6700Fourier infrared spectrometer (FT-IR) and a model NETZSCH STA 449C simultaneous thermal analyzer (TG-DSC), respectively. The Shore hardness of the sintered composite samples was measured by a Shore hardness tester. The tribological properties of the composites were tested by a model Optimal SRV-IV ball-disc friction and wear tester. The 3D morphology, surface roughness and wear volume of the wear scars on the composites were determined by a model Olympus LEXT OLS4000 laser confocal microscope. The morphology and chemical composition of the worn composite and steel surfaces were examined by a model FEI Nova Nano SEM 450 field emission scanning electron microscope (FESEM) and an attached X-ray energy spectrometer (EDS). The chemical state of the major elements on the worn steel surface was analyzed by a model ESCALAB 250Xi X-ray photoelectron spectrometer (XPS).

Results and discussion

Compared to pure PTFE, the peak intensity of composite materials with different components obtained by adding minerals is reduced. The possible reason is that the addition of minerals hinders the nucleation and crystallization of PTFE, leading to a decrease in the crystallinity. In addition, no chemical reaction occurs during the process of introducing serpentine and wollastonite into PTFE by a pressureless sintering technology.

The powders of antigorite and wollastonite are evenly dispersed in PTFE, with slight aggregation of antigorite. The mineral particles are tightly bound to the PTFE matrix, and there are no obvious defects such as pores and cracks in the composite. The average friction coefficient and wear volume of PTFE-based composites with simultaneous addition of 10% (in mass fraction) antigorite and 20% wollastonite are reduced by 44.2% and 71.4%, respectively, compared to pure PTFE. The composites exhibit excellent tribological properties due to the reinforcement of PTFE by minerals and the formation of a tribo-layer on the dual steel surface, which has high hardness and self-lubricating properties. Compared with the addition of a single antigorite, the addition of wollastonite minerals lowers the phase transition temperature of antigorite and promotes the formation of the tribo-layer, which has a good synergistic effect on the improvement of the tribological properties of the composites.

Conclusions

The mineral reinforced PTFE composite material was obtained via introducing antigorite and wollastonite minerals into PTFE and pressureless sintering, which had a dense structure, a uniform distribution of reinforcements, and an increased Shore hardness (from 11.5% to 23.7%), compared to pure PTFE.

Single addition of antigorite could improve the wear resistance of PTFE and increased the frictional stability, while the simultaneous introduction of antigorite and wollastonite could improve both the anti-wear and friction reducing properties of PTFE. The average friction coefficient and wear volume of (10Atg+20Wl)/PTFE were reduced by 44.2% and 71.4%, respectively, compared to pure PTFE.

The improvement of the tribological properties of mineral containing PTFE was attributed to the strengthening effect of minerals on the polymer and the formation of a tribo-layer with high hardness and self-lubricating properties on the dual surface. Compared with the addition of single antigorite, the simultaneous addition of wollastonite reduced the phase transformation temperature of antigorite, and promoted the formation of tribo-layer on the worn surface, thus having a good synergistic effect.

Key words

antigorite / wollastonite / polytetrafluoroethylene / tribolayer / friction and wear

引用本文

王晨, 白志民, 于鹤龙, 尹艳丽, 宋占永, 王申, 杨喆. 叶蛇纹石和硅灰石对聚四氟乙烯摩擦磨损行为的影响. 硅酸盐学报, 2024 , 52 (6) : 2081 -2093 . DOI: 10.14062/j.issn.0454-5648.20230711

Chen WANG, Zhimin BAI, Helong YU, Yanli YIN, Zhanyong SONG, Shen WANG, Zhe YANG. Influences of Antigorite and Wollastonite on Friction and Wear Behaviors of Polytetrafluoroethylene[J]. Journal of the Chinese Ceramic Society, 2024 , 52 (6) : 2081 -2093 . DOI: 10.14062/j.issn.0454-5648.20230711

基金

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国家自然科学基金(52075544)

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2024年第52卷第6期

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文章信息

doi: 10.14062/j.issn.0454-5648.20230711

接收时间：2023-09-14
首发时间：2026-10-22
出版时间：2024-06-20

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收稿日期：2023-09-14
修回日期：2023-09-22

基金

国家自然科学基金(52075544)

作者信息

^1．中国地质大学（北京）材料科学与工程学院，北京 100083

^2．陆军装甲兵学院再制造技术国家级重点实验室，北京 100072

^3．西安理工大学印刷包装与数字媒体学院，西安 710048

通讯作者:

于鹤龙（1979—），男，博士，副研究员。

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https://castjournals.cast.org.cn/joweb/gsyxb/CN/10.14062/j.issn.0454-5648.20230711

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2种不同金属材料的力学参数

科 Family	属数 Number of genus	种数 Number of species	占总种数比例 Percentage of total species (%)	属 Genus	种数 Number of species	占总种数比例 Percentage of total species (%)
鹅膏菌科Amanitaceae	2	11	5.26	鹅膏菌属 Amanita	10	4.78
小菇科 Mycenaceae	2	12	5.74	丝盖伞属 Inocybe	5	2.39
多孔菌科 Polyporaceae	8	14	6.70	蜡蘑属 Laccaria	5	2.39
红菇科 Russulaceae	3	23	11.00	小皮伞属 Marasmius	6	2.87
				小菇属 Mycena	11	5.26
				光柄菇属 Pluteus	5	2.39
				红菇属 Russula	17	8.13
				栓菌属 Trametes	5	2.39

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