powderИзвестия вузов. Порошковая металлургия и функциональные покрытияPowder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya)1997-308X2412-8767НИТУ "МИСИС"10.17073/1997-308X-0-0-powder-1092Research ArticleСамораспространяющийся высокотемпературный синтезSelf-Propagating High-Temperature Synthesis (SHS)Структура и свойства керамики Ta(C,N)–Ta5Si3–Si3N4–SiAlON, полученной методами СВС с твердым источником азота и горячего прессованияStructure and properties of Ta(C,N)–Ta5Si3–Si3N4–SiAlON ceramics fabricated by SHS using a solid nitrogen source followed by hot pressinghttps://orcid.org/0000-0002-0835-2137ПотанинА. Ю.PotaninA. Yu.

Артём Юрьевич Потанин – к.т.н., ст. науч. сотрудник Научно-учебного центра (НУЦ) СВС МИСИС–ИСМАН

Россия, 119049, г. Москва, Ленинский пр-т, 4, стр. 1

Artem Yu. Potanin – Cand. Sci. (Eng.), Senior Research Scientist, Educational Center of Self-Propagating High-Temperature Synthesis (SHS-Center) of MISIS–ISMAN

1 Bld, 4 Leninskiy Prosp., Moscow 119049, Russia

a.potanin@inbox.ruhttps://orcid.org/0000-0001-6719-6237МукановС.MukanovS. K.

Самат Куандыкович Муканов – к.т.н., науч. сотрудник НУЦ СВС МИСИС–ИСМАН

Россия, 119049, г. Москва, Ленинский пр-т, 4, стр. 1

Samat K. Mukanov – Cand. Sci. (Eng.), Research Scientist, SHS-Center of MISIS–ISMAN

1 Bld, 4 Leninskiy Prosp., Moscow 119049, Russia

sam-mukanov@mail.ruhttps://orcid.org/0000-0001-6934-9137ЗайцевА. А.ZaitsevA. A.

Александр Анатольевич Зайцев – к.т.н., доцент кафедры порошковой металлургии и функциональных покрытий (ПМиФП) НИТУ МИСИС, ст. науч. сотрудник НУЦ СВС МИСИС–ИСМАН

Россия, 119049, г. Москва, Ленинский пр-т, 4, стр. 1

Alexandr A. Zaitsev – Cand. Sci. (Eng.), Associate Professor, Department of Powder Metallurgy and Functional Coatings (PM&FC) of NUST MISIS; Senior Research Scientist, SHS-Center of MISIS–ISMAN

1 Bld, 4 Leninskiy Prosp., Moscow 119049, Russia

aazaitsev@bk.ruhttps://orcid.org/0000-0002-4662-544XШвындинаН. В.ShvyndinaN. V.

Наталия Владимировна Швындина – вед. инженер НУЦ СВС МИСИС–ИСМАН

Россия, 119049, г. Москва, Ленинский пр-т, 4, стр. 1

Nataliya V. Shvyndina – Lead Engineer, SHS-Center of MISIS–ISMAN

1 Bld, 4 Leninskiy Prosp., Moscow 119049, Russia

natali19-03@list.ruhttps://orcid.org/0000-0002-0623-0013ЛевашовЕ. А.LevashovE. A.

Евгений Александрович Левашов – д.т.н., проф., чл.-корр. РАН, зав. кафедрой ПМиФП НИТУ МИСИС, директор НУЦ СВС МИСИС–ИСМАН

Россия, 119049, г. Москва, Ленинский пр-т, 4, стр. 1

Evgeny A. Levashov – Dr. Sci. (Eng.), Professor, Corresponding Member of the Russian Academy of Sciences, Head of the Department of PM&FC of NUST MISIS; Head of the SHS-Center of MISIS–ISMAN

1 Bld, 4 Leninskiy Prosp., Moscow 119049, Russia

levashov@shs.misis.ruНациональный исследовательский технологический университет «МИСИС»РоссияNational University of Science and Technology “MISIS”Russian Federation2026161020262033447Copyright © Потанин А.Ю., Муканов С.K., Зайцев А.А., Швындина Н.В., Левашов Е.А., 20262026Потанин А.Ю., Муканов С., Зайцев А.А., Швындина Н.В., Левашов Е.А.Potanin A.Y., Mukanov S.K., Zaitsev A.A., Shvyndina N.V., Levashov E.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://powder.misis.ru/jour/article/view/1092

Методом самораспространяющегося высокотемпературного синтеза (СВС) с использованием твердого источника азота (Si3N4) в системе Ta–Si3N4–C получен гетерофазный порошок-прекурсор. Процесс горения протекал при температуре 1910 °C и скорости распространения фронта 1,42 мм/с. Показано, что продукты СВС содержат карбонитрид тантала Ta(C,N), силицид Ta5Si3 и незначительное количество промежуточных фаз TaC и Ta2N. Методом горячего прессования в среде азота со спекающими добавками Si3N4 и YAG получена компактная керамика состава Ta(C,N)–Ta5Si3–Si3N4–SiAlON. Методами рентгенофазового анализа, сканирующей и просвечивающей электронной микроскопии установлено, что материал имеет однородную микроструктуру, включающую зерна карбонитрида тантала (до 2 мкм), силицида Ta5Si3 (до 3 мкм) и β-Si3N4 (до 5 мкм); на границах зерен нитрида кремния формируются аморфные прослойки Y–Si–Al–O–N, способствую­щие жидкофазному спеканию. Керамика имеет твердость 17,3 ГПа, трещиностойкость 5,9 МПа·м0,5, предел прочности на изгиб 410 МПа и коэффициент теплопроводности 13,26 Вт/(м·К). Трибологические испытания по схеме «стержень–диск» показали, что с ростом скорости скольжения от 0,3 до 0,8 м/с происходит снижение коэффициента трения от 0,82 до 0,72 и двукратное уменьшение приведенного износа. Это обусловлено сменой доминирующего механизма изнашивания с усталостно-абразивного на трибохимический с формированием оксидных фаз AlTaO4 и SiOx–TaOy . Полученные результаты демонстрируют перспективность разработанной керамики для применения в узлах трения, работающих в условиях высоких контактных нагрузок и скоростей скольжения.

A multiphase precursor powder was synthesized by self-propagating high-temperature synthesis (SHS) using Si3N4 as a solid nitrogen source in the Ta–Si3N4–C system. Combustion occurred at 1910 °C, and the combustion-front velocity was 1.42 mm/s. The SHS products comprised tantalum carbonitride Ta(C,N), Ta5Si3 silicide, and minor amounts of the intermediate phases TaC and Ta2N. Dense Ta(C,N)–Ta5Si3–Si3N4–SiAlON ceramics were fabricated by hot pressing in nitrogen with Si3N4 and YAG as sintering aids. X-ray diffraction, scanning electron microscopy, and transmission electron microscopy showed a homogeneous microstructure composed of tantalum carbonitride grains (up to 2 µm), Ta5Si3 silicide (up to 3 µm), and β-Si3N4 (up to 5 µm); amorphous Y–Si–Al–O–N intergranular films formed along silicon nitride grain boundaries and promoted liquid-phase sintering. The ceramics exhibited a hardness of 17.3 GPa, fracture toughness of 5.9 MPa·m0.5, flexural strength of 410 MPa, and thermal conductivity of 13.26 W/(m·K). Pin-on-disk tests showed that increasing the sliding velocity from 0.3 to 0.8 m/s reduced the coefficient of friction from 0.82 to 0.72 and halved the specific wear rate. This behavior was attributed to a shift in the dominant wear mechanism from fatigue–abrasive wear to tribochemical wear, accompanied by the formation of AlTaO4 and SiOx–TaOy oxide phases. These results indicate that the developed ceramics are promising for tribological components subjected to high contact loads and sliding velocities.

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