najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2024-15-4-530-539najo-48Research ArticleCHEMISTRY AND MATERIALS SCIENCEХИМИЯ И НАУКА О МАТЕРИАЛАХFormation of ultra- and nanodis- persed “core-shell” structures Ti0.8Mo0.2C0.5N0.5–Ni–Mo in the process of plasma-chemical synthesis of a mechanical mixture of titanium carbonitride with metallic nickel and molybdenumФормирование ультра- и нанодисперсных структур «ядро-оболочка» Ti0,8Mo0,2C0,5N0,5 – Ni – Mo в процессе плазмохимического синтеза механической смеси карбонитрида титана с металлическими Ni и Mohttps://orcid.org/0000-0002-1470-0476АвдееваЮ. А.AvdeevaYu. A.

Yuliya A. Avdeeva – Institute of Solid State Chemistry Pervomaiskaya Street, 91, Ekaterinburg, 620990

y-avdeeva@list.ruhttps://orcid.org/0000-0001-9123-5371ЛужковаИ. В.LuzhkovaI. V.

Irina V. Luzhkova – Institute of Solid State Chemistry,  Pervomaiskaya Street, 91, Ekaterinburg, 620990

key703@yandex.ruhttps://orcid.org/0000-0003-4440-427XМурзакаевА. М.MurzakaevA. M.

Aidar M. Murzakaev – Institute of Electrophysics

Amundsen Street, 106, Ekaterinburg, 620216

aidar@iep.uran.ruhttps://orcid.org/0000-0002-2746-5292ЕрмаковА. Н.ErmakovA. N.

Alexey N. Ermakov – Institute of Solid State Chemistry Pervomaiskaya Street, 91, Ekaterinburg, 620990

ermakovihim@yandex.ruUral Branch, Russian Academy of SciencesRussian Federation202431052025154530539Copyright © Avdeeva Y.A., Luzhkova I.V., Murzakaev A.M., Ermakov A.N., 20252025Авдеева Ю.А., Лужкова И.В., Мурзакаев А.М., Ермаков А.Н.Avdeeva Y.A., Luzhkova I.V., Murzakaev A.M., Ermakov A.N.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/48

Ultradisperse and nanocrystalline powder compositions were obtained in the process of plasma chemical synthesis of a mechanical mixture of titanium carbonitride TiC0.5N0.5 with metallic nickel and molybdenum in a low-temperature nitrogen plasma (4000 – 6000 ◦C), taking into account recondensation in a turbulent flow of nitrogen gas. It was established by X-ray diffraction that their phase composition is characterized by the presence of cubic compounds in the form of titanium-molybdenum carbonitride Ti0.8Mo0.2C0.5N0.5, metallic Ni and Mo. High-resolution transmission electron microscopy was used to visualize a “core-shell” structure in the nanocrystalline fraction, which includes such phases as Ti1−nMonCxNy , Ni, NiO, TiO2, MoC0.5N0.5. The experimental data on measurements of the specific surface area by the BET method and the pycnomentric density made it possible to determine the calculated values of the average particle sizes which were 365 and 56 nm for the fractions from the cyclone and the filter, respectively. The average particle size of the nanocrystalline component of the fraction from the cyclone, according to the results of direct measurements, was 22 nm. Based on the obtained experimental results, a model for the formation of Ti0.8Mo0.2C0.5N0.5–Ni–Mo “core-shell” structures has been developed, which is implemented under the conditions of a turbulent flow of nitrogen gas formed in a quenching chamber of a plasma chemical plant.

В процессе плазмохимического синтеза механической смеси карбонитрида титана TiC0,5N0,5 с металлическими никелем и молибденом в низкотемпературной азотной плазме (4000 – 6000 0С) с учетом переконденсации в турбулентном потоке газообразного азота получены порошковые композиции ультрадисперсного и нанокристаллического диапазона. Рентгенографически установлено, что фазовый состав характеризуется наличием кубических соединений в виде титан-молибденового карбонитрида Ti0,8Mo0,2C0,5N0,5, металлического Ni и Mo. Методами просвечивающей электронной микроскопии высокого разрешения в нанокристаллической фракции  визуализирована структура «ядро-оболочка», в состав которой входят такие фазы как Ti1-nMonCxNy, Ni, NiO, TiO2, MoC0,5N0,5.

Совокупность экспериментальных данных по измерению площади удельной поверхности методом BET и пикноментрической плотности позволили определить расчетные значения средних размеров частиц, которые составили 365 и 56 нм для фракций из циклона и фильтра, соответственно. Средний размер частиц нанокристаллической сроставляющей фракции из циклона, по результатам прямых измерений состави 22 нм.

На основе полученных экспериментальных результатов разработана модель формирования структур «ядро-оболочка» Ti0.8Mo0.2C0.5N0.5 – Ni – Mo, реализуемая в условиях турбулентного потока газообразного азота сформированного в закалочной камере плазмохимической установки.

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