Frictional Properties and Wear of Composites Based on PTFE / Layered Silicates

This study focuses on enhancing the tribological performance of polytetrafluoroethylene (PTFE) composites by incorporating graphene nanoplatelets (GNPs) through compression moulding technique. The main aim of the research was to investigate how varying weight percentages of GNP (1 wt %, 3 wt % and 5 wt %) influence the friction and wear properties of PTFE composites under both dry sliding and saline water environment. A significant reduction in the coefficient of friction (COF) and wear rate was observed with the addition of GNP, particularly in seawater. Specifically, the reduction of COF in sea water reached up to 58.765% with 3% of GNP compared to dry sliding. For wear reduction, a reduction of up to 90.247% was observed with 5% GNP in sea water condition. These findings reveal the potential of GNP-filled PTFE composites in applications requiring enhanced tribological properties in both dry and aqueous environments. The originality of this work lies in the comprehensive analysis of the environmental influence on GNP-filled PTFE composites, providing understandings of their applicability in marine environments.

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Influence of Nano-Sized Zinc Oxide on the Properties of Polytetrafluoroethylene

Иванов,

Васильев,

Охлопкова

2024

Южно-Сибирский Научный Вестник

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В настоящее время при разработке антифрикционных материалов актуальным становится использование полимерныхкомпозиционныхматериалов (ПКМ) на основе полимерной матрицы с самосмазывающимися свойствами. Антифрикционные материалы находят широкое применение в разных узлах трения техники и технологического оборудования. В качестве основы ПКМ отлично показывает себя политетрафторэтилен (ПТФЭ), который обладает широкимдиапазономрабочих температур и низкимкоэффициентомтрения. Однако ПТФЭ имеет недостатки в виде высокой скорости массового изнашивания и хладотекучести. Для устранения недостатков в полимер вводят различные наполнители, в особенности дисперсные наноразмерные частицы, так как они показывают существенное влияние на эксплуатационные характеристики. В данной работе в качестве наполнителя был использован наноразмерный оксид цинка, который предварительно подвергнут ультразвуковому воздействию. Исследованы физико-механические, триботехнические свойства и термодинамические параметры ПКМ. Триботехнические исследования показали повышение износостойкости ПКМ при сохранении низкого значения их коэффициента трения. Поверхность трения материаловисследовали методом ИК-спектроскопии, где выявлено протекание трибохимических реакций. Разработанные материалы благодаря улучшенным триботехническим свойствам могут найти применение в качестве уплотнителей в узлах трения машин и техники. Currently, in the development of antifriction materials, the use of polymer composite materials (PCM) based on a polymer matrix with self-lubricating properties is becoming relevant. Antifriction materials are widely used in various friction units of machinery and technological equipment. Polytetrafluoroethylene (PTFE), which has a wide range of operating temperatures and a low coefficient of friction, performs well as a PCM base. However, PTFE has the disadvantages of high mass wear rates and cold flow. To eliminate the shortcomings, various fillers are introduced into the polymer, especially dispersed nano-sized particles, as they have a significant impact on performance characteristics. In this work, nanosized zinc oxide was used as a filler, which was previously subjected to ultrasonic treatment. The mechanical, tribological properties and thermodynamic parameters of PCM have been studied. Tribological studies have shown an increase in the wear resistance of PCM while maintaining a low value of their friction coefficient. The friction surface of the materials was studied by IR spectroscopy, where the occurrence of tribochemical reactions was revealed. Thanks to their improved tribological properties, the developed materials can be used as seals in friction units of machines and equipment.

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Frictional Properties and Wear of Composites Based on PTFE / Layered Silicates

Cited by 4 publications

References 28 publications

An investigation on enhancing the wear resistance of PTFE-based composites through complex fillers incorporating a combination of kaolinite and single-walled carbon nanotubes

An investigation on enhancing the wear resistance of PTFE-based composites through complex fillers incorporating a combination of kaolinite and single-walled carbon nanotubes

Tribological characteristics of graphene nanoplatelets-filled PTFE under dry sliding and sea water environmental conditions

Influence of Nano-Sized Zinc Oxide on the Properties of Polytetrafluoroethylene

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