vestiftИзвестия Национальной академии наук Беларуси. Серия физико-технических наукProceedings of the National Academy of Sciences of Belarus. Physical-technical series1561-83582524-244XThe Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"10.29235/1561-8358-2021-66-2-180-185vestift-665Research ArticleМАТЕРИАЛОВЕДЕНИЕ, МЕТАЛЛУРГИЯMATERIALS SCIENCES AND ENGINEERING, METALLURGYОценка влияния способа подготовки на микропористость спеченных заготовок из композиций на основе политетрафторэтиленаEvaluation of influence of method for preparing on microporosity of sintered polytetrafluoroethylene-based compositionsВоропаевВ. В.VarapayeuV. V.

Воропаев Виктор Викторович – кандидат технических наук, заместитель декана факультета инновационных технологий машиностроения

ул. Ожешко, 22, 230023, Гродно, Республика Беларусь

Viktar V. Varapayeu – Ph. D. (Engineering), Deputy Dean of the Faculty of Innovative Mechanic Engineering Technologies

22, Ozheshko Str., 230023, Grodno, Republic of Belarus

voropaev_vv@grsu.byБарсуковВ. Г.BarsukouU. G.

Барсуков Владимир Георгиевич – доктор технических наук, доцент, заведующий кафедрой технической механики

ул. Ожешко, 22, 230023, Гродно, Республика Беларусь

Uladzimir G. Barsukou – D. Sc. (Engineering), Associate Professor, Head of the Department of Technical Mechanics

22, Ozheshko Str., 230023, Grodno, Republic of Belarus

v.g.barsukov@grsu.byВоропаеваЕ. Т.VarapayevaYa. T.

Воропаева Евгения Тимофеевна – старший преподаватель, кафедра машиноведения и технической эксплуатации автомобилей факультета инновационных технологий машиностроения

ул. Ожешко, 22, 230023, Гродно, Республика Беларусь

Yauheniya T. Varapayeva – Senior Lecturer, Department of Mechanical Engineering and Technical Operation of Cars, Faculty of Innovative Mechanic Engineering Technologies

22, Ozheshko Str., 230023, Grodno, Republic of Belarus

frezaz@yandex.ruГродненский государственный университет имени Янки КупалыYanka Kupala State University of Grodno202116072021662180185Copyright © Воропаев В.В., Барсуков В.Г., Воропаева Е.Т., 20212021Воропаев В.В., Барсуков В.Г., Воропаева Е.Т.Varapayeu V.V., Barsukou U.G., Varapayeva Y.T.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://vestift.belnauka.by/jour/article/view/665

Представлены результаты работы, целью которой являлась оценка влияния способа подготовки на пористость формованных заготовок из порошкообразного политетрафторэтилена, а также его смесей с углеродным волокном и добавками пылевидного графита. Для достижения поставленной цели был выполнен сравнительный анализ влияния способа подготовки на микропористость спеченных заготовок из наполненного и ненаполненного пресс-материала на основе политетрафторэтилена. Методология определения микропористости заключалась в расчете соотношения фактической плотности заготовок и теоретической для беспористого материала, определенной методами структурной механики композитов. Результаты выполненных исследований показали, что заготовки из ненаполненного фторопласта, спрессованные при давлении 70…80 МПа, как правило, имеют пористость от 1,3 до 5,9 %. Исключение составляет образец, полученный спеканием в условиях всестороннего сжатия, у которого была достигнута нулевая пористость. Пористость заготовок, полученных из фторопласта, наполненного измельченным углеродным волокном и пылевидным графитом, составляет в абсолютном большинстве случаев от 0,4 до 3,9 %. Исключение представляет образец с содержанием наполнителя 40 мас.%, у которого пористость равна 16 %. Как для исходного, так и для наполненного политетрафторэтилена спекание в условиях всестороннего сжатия во всех опытах способствовало уменьшению остаточной микропористости. Это свидетельствует о технической эффективности такого метода получения изделий, несмотря на повышение трудоемкости процесса и усложнение средств технического оснащения.

The aim of the work is to assess the influence of the method for preparing on the porosity of sintered polytetrafluoroethylene blanks as well as PTFE mixtures with carbon fiber and additives of powdered graphite. The article provides a comparative analysis of the method for preparing influence on the microporosity of sintered blanks made of filled and unfilled polytetrafluoroethylene. Microporosity has been determined through the comparison of the actual and theoretical (for a non-porous material) density of blanks, calculated by the methods of structural mechanics of composites. The studies made it possible to establish that the porosity of the unfilled polytetrafluoroethylene blanks pressed at a pressure of 70…80 MPa stands at 1.3 to 5.9 %. An exception was a specimen obtained by sintering in a jig, which has reached apparent density 2200 kg/m3 equal to theoretical density. It has been established, that the porosity of blanks obtained from polytetrafluoroethylene filled with shredded carbon fiber and powdered graphite stood at 0.4 to 3.9 %. An exception was a specimen with a high mass content of filler (40 %), in which the porosity was 16 %. It has been ascertained that sintering in a constrained state helps to reduce the residual microporosity for both the filled and unfilled polytetrafluoroethylene. This shows the technical efficiency of sintering in a constrained state, despite the increased labor intensity of the manufacturing process and the sophistication of technical equipment.

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The authors declare that there are no conflicts of interest present.