Obrabotka Metallov / Metal Working and Material ScienceObrabotka Metallov / Metal Working and Material ScienceОбработка металлов (технология • оборудование • инструменты)1994-63092541-819XНовосибирский государственный технический университет46266210.17212/1994-6309-2026-28.3-6-28OJFHSXTECHNOLOGYТЕХНОЛОГИЯResearch ArticleEffect of filler morphology on cryogenic treatment sintered PTFE nanocompositesВлияние морфологии наполнителя на эффективность криогенной обработки спеченных ПТФЭ-нанокомпозитовhttps://orcid.org/0000-0002-3719-015756465985000ДамдхарВинодDamdharVinod
India

канд. техн. наук, доцент;

Doctor of Philosophy, Associate Professor;

vinod.damdhar@gmail.comhttps://orcid.org/0000-0003-3201-441855190930500B-5809-2016ПандеКавитаPandeKavita
India

канд. техн. наук, профессор

Doctor of Philosophy, Professor

kavita19pande@gmail.comhttps://orcid.org/0000-0003-2132-053256206386500АутиАрунAuteeArun
India

канд. техн. наук, доцент

Doctor of Philosophy, Associate Professor

arun.autee@mit.asiaТехнологический институт МахараштрыMaharashtra Institute of TechnologyЦентр инженерных разработок, Инженерный колледж им. Чхатрапати Шаху Махараджа Образовательного фонда CSMSSCenter for Engineering Exploration, C.S.M.S.S. Chh. Shahu College of EngineeringООО «Матвёрс Вижн» (Matverse Vision Pvt Ltd)Matverse Vision Pvt Ltd.ruen283ТОМ 28, №3 (2026)VOL 28, NO3 (2026)62802052026Copyright ©; 2026, Damdhar V., Pande K., Autee A.Copyright ©; 2026, Дамдхар В., Панде К., Аути А.2026Damdhar V., Pande K., Autee A.Дамдхар В., Панде К., Аути А.https://creativecommons.org/licenses/by/4.0https://journals.rcsi.science/1994-6309/article/view/462662

Introduction. Polytetrafluoroethylene (PTFE) has outstanding chemical resistance and a low friction coefficient but weak mechanical properties and wear resistance, which restrict its wider use in tribological applications. Thus, the present study aims to investigate the coupled influence of nano-filler geometry and cryogenic treatment on the structure–property evolution of PTFE nanocomposites. Materials and methods. The optimized nanocomposite systems (1.0 wt.% nano-mica and 1.5 wt.% nano-alumina), along with neat PTFE, were produced by cold compression moulding and sintering. The specimens were soaked for 8, 12, and 16 h in liquid nitrogen at −185 °C and then evaluated for mechanical, tribological, and structural properties using XRD, FTIR, and SEM. Results and discussion. Compared to untreated PTFE (~27.6 MPa tensile strength), both nano-fillers enhanced the strength and wear resistance. The composites exhibited a strong geometry-dependent response to cryogenic treatment. The tensile strength of mica-filled PTFE was at a maximum at 8 h (~37.9 MPa), while alumina-filled PTFE reached its peak at 16 h (~36.5 MPa). The same trend was observed for hardness and wear resistance. XRD revealed reordering of crystallinity and improved filler–matrix interaction, while SEM showed more stable interfaces in the alumina composites. Extended treatment caused interfacial heterogeneity and defects in mica-filled PTFE, attributed to its flaky morphology. Conclusion. Filler geometry is a major determinant of the effectiveness of cryogenic treatment in PTFE nanocomposites. Globular nano-alumina exhibited superior tensile strength, hardness, and wear resistance compared to flaky nano-mica after long-term cryogenic treatment. This study presents important structure–property relationships for the development of PTFE-based nanocomposites for advanced tribological applications.

Введение. Политетрафторэтилен (ПТФЭ) обладает исключительной химической стойкостью и малым коэффициентом трения, однако низкие прочностные характеристики и износостойкость существенно сужают область применения ПТФЭ в трибологических узлах. В связи с этим целью настоящей работы являлось установление закономерностей совместного влияния геометрического фактора нанонаполнителей и параметров криогенной обработки на структурно-фазовую эволюцию и комплекс свойств ПТФЭ-нанокомпозитов. Материалы и методы исследования. Объектами исследования служили ПТФЭ без наполнителей и оптимизированные нанокомпозитные системы, содержащие 1,0 масс. % наноразмерной слюды и 1,5 масс. % наноразмерного оксида алюминия соответственно. Формование образцов осуществляли методом холодного прессования с последующим спеканием. Криогенную выдержку проводили в среде жидкого азота при температуре −185 °C, варьируя время выдержки (8, 12 и 16 ч). Оценку механических и трибологических характеристик, а также анализ структурных превращений выполняли с использованием рентгенофазового анализа (РФА), ИК-спектроскопии с преобразованием Фурье (ИК-Фурье) и растровой электронной микроскопии (РЭМ). Результаты и обсуждение. Установлено, что введение обоих типов нанонаполнителей в исходный ПТФЭ (предел прочности при растяжении ~27,6 МПа) обеспечивает повышение предела прочности и износостойкости. При этом установлено, что чувствительность композиционных материалов к криогенной обработке зависит от геометрии частиц наполнителя. Для композита с наноразмерной слюдой максимальная прочность зафиксирована при минимальной длительности выдержки (8 ч) и составляет ~37,9 МПа; для композита с наноразмерным оксидом алюминия максимальное значение зафиксировано после выдержки в течение 16 ч (~36,5 МПа). Аналогичные закономерности установлены для твердости и износостойкости. Данные РФА свидетельствуют об упорядочении кристаллической структуры и усилении межфазного взаимодействия наполнителя с полимерной матрицей, а результаты РЭМ подтверждают формирование более стабильных межфазных границ в композитах с наноразмерным оксидом алюминия. Продолжительная криогенная обработка приводит к развитию межфазной гетерогенности и образованию дефектов в материале с наноразмерной слюдой, что обусловлено ее чешуйчатой морфологией. Заключение. Морфология наполнителя является ключевым фактором, определяющим эффективность криогенной обработки ПТФЭ-нанокомпозитов. После длительной криогенной обработки глобулярный наноразмерный оксид алюминия обеспечивает превосходные показатели прочности при растяжении, твердости и износостойкости по сравнению с чешуйчатой наноразмерной слюдой. Установленные структурно-свойственные корреляции имеют большое значение для разработки ПТФЭ-нанокомпозитов, ориентированных на работу в условиях интенсивного трения и износа.

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