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"10.29235/1561-8358-2019-64-2-166-174vestift-437Research ArticleМАТЕРИАЛОВЕДЕНИЕ, МЕТАЛЛУРГИЯMATERIALS SCIENCES AND ENGINEERING, METALLURGYУпрочнение композиционных материалов на основе металлической матрицы и углеродных нанотрубокStrengthening of the composite materials based on metal matrix and carbon nanotubesПасовецВ. Н.PasovetsV. N.

Пасовец Владимир Николаевич – кандидат технических наук, доцент, Университет гражданской защиты МЧС Беларуси; докторант ГНПО порошковой металлургии

ул. Машиностроителей, 25, 220118, Минск; ул. Платонова, 41, 220005, Минск

Vladimir N. Pasovets – Ph. D. (Engineering), Associate Professor; Doctoral Student 

25, Mashinostroiteley Str., 220118, Minsk; 41, Platonov Str., 220005, Minsk

pasovets_v@mail.ruКовтунВ. А.KovtunV. A.

Ковтун Вадим Анатольевич – доктор технических наук, профессор

пр. Речицкий, 35, 246021, Гомель

Vadim A. Kovtun – D. Sc. (Engineering), Professor

35, Rechitsky Ave., 246021, Gomel

vadimkov@yandex.ruУниверситет гражданской защиты МЧС Беларуси; ГНПО порошковой металлургииUniversity of Civil Protection of the Ministry of Emergency Situations of Belarus; State Scientific and Production Association of Powder MetallurgyГомельский филиал Университета гражданской защиты МЧС БеларусиGomel branch of the University of Civil Protection of the Ministry of Emergency Situations of Belarus201929062019642166174Copyright © Пасовец В.Н., Ковтун В.А., 20192019Пасовец В.Н., Ковтун В.А.Pasovets V.N., Kovtun V.A.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/437

Рассмотрены механизмы упрочнения металлической матрицы частицами наноразмерного наполнителя. Выполнен сравнительный анализ расчетных и экспериментальных значений предела прочности для образцов на основе медной матрицы и углеродных нанотрубок (УНТ). Представлены линейная и среднеквадратическая модели упрочнения композиционных материалов с наноразмерным наполнителем. Показано, что применение среднеквадратической модели обеспечивает получение значений предела прочности близких к экспериментальным при концентрации УНТ в материале до 0,07 мас.%. Установлено, что по критерию прочности оптимальным содержанием УНТ в материале является 0,07 мас.%. С увеличением содержания УНТ в материале свыше 0,07 мас.% значения предела прочности, определенные экспериментальным путем, резко снижаются, что связано с разупрочнением металлической матрицы. Расчетным путем продемонстрировано, что механизм образования петель Орована является преобладающим механизмом упрочнения композиционных материалов медь – УНТ. Преобладание механизма упрочения за счет образования петель Орована над другими механизмами упрочнения объясняется относительно низкой эффективностью передачи нагрузки между исходными компонентами материала из-за слабой межфазной связи между матрицей и наполнителем, недостаточно равномерным распределением УНТ в металлической матрице, агломерацией наноразмерного наполнителя, расположением некоторого количества УНТ в поровом пространстве металлической матрицы, наличием пор неправильной формы. Результаты исследований использованы при разработке новых антифрикционных композиционных материалов с улучшенными прочностными свойствами для узлов трения машин и механизмов различного назначения.

Carbon nanotube (CNT)-reinforced powder nanocomposites based on copper matrix were successfully fabricated using a spark plasma sintering method. In this work, the mechanisms of hardening the metal matrix with nanosized filler particles were shown. A comparative analysis of the calculated and experimental values of the ultimate compressive strength for samples based on the copper matrix and carbon nanotubes was performed. Linear and root-mean-square models of hardening of composite materials with nano-sized filler were presented. The root-mean-square model allowed us to calculate reliably the values of the ultimate compressive strength at a concentration of CNT in the material up to 0.07 wt.%. The ultimate compressive strength decreases sharply when the content of CNTs in the material is more than 0.07 wt.%. The Orovan mechanism is the predominant mechanism of strengthening of composite materials: copper – CNT. The predominance of Orovan mechanism over other strengthening mechanisms is explained by the relatively low transfer efficiency of the load between the initial components of the material due to the weak interfacial connection between the matrix and the filler, the insufficiently uniform distribution of CNTs in the metal matrix, the agglomeration of nanosized filler, the location of a certain number of CNTs in the pore space of the metal matrix, the presence of pores of irregular shape. The results of the work were used in the development of new antifriction composite materials with improved strength properties for friction units of machines and mechanisms for various purposes.

медьметаллическая матрицауглеродные нанотрубки (УНТ)порошок медипредел прочностиупрочнениеcoppermetal matrixcarbon nanotubes (CNT)copper powderultimate compressive strengthstrengtheningРабота выполнена при финансовой поддержке Белорусского республиканского фонда фундаментальных исследований в рамках проекта международных исследований Т17МС-015 на 2017–2019 гг., осуществляемого совместно Университетом гражданской защиты МЧС Беларуси и Институтом механики Болгарской академии наук.The work was supported by the Belarusian Republican Foundation for Fundamental Research (Project T17MS-015). The authors wish to thank to the researchers of the Laboratory “Mechanics, Diagnostics, Non-Destructive Testing” of the Institute of Mechanics of the Bulgarian Academy of Sciences for their assistance in setting up the experiment and discussing the results of the presented work.ReferencesMirza, F. 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The authors declare that there are no conflicts of interest present.