Formation 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 molybdenum
https://doi.org/10.17586/2220-8054-2024-15-4-530-539
Abstract
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.
Keywords
Titanium carbonitride,
nickel,
molybdenum,
plasma-chemical synthesis,
X-ray phase analysis,
high-resolution transmission electron microscopy
Supporting agencies: The work was carried out in accordance with the state assignment for the Institute of Solid State Chemistry of the Ural Branch of the Russian Academy of Sciences (theme No. 124020600024-5).
About the Authors
Yu. A. Avdeeva
Ural Branch, Russian Academy of Sciences
Russian Federation
Russian Federation
Yuliya A. Avdeeva – Institute of Solid State Chemistry Pervomaiskaya Street, 91, Ekaterinburg, 620990
I. V. Luzhkova
Ural Branch, Russian Academy of Sciences
Russian Federation
Russian Federation
Irina V. Luzhkova – Institute of Solid State Chemistry, Pervomaiskaya Street, 91, Ekaterinburg, 620990
A. M. Murzakaev
Ural Branch, Russian Academy of Sciences
Russian Federation
Russian Federation
Aidar M. Murzakaev – Institute of Electrophysics
Amundsen Street, 106, Ekaterinburg, 620216
A. N. Ermakov
Ural Branch, Russian Academy of Sciences
Russian Federation
Russian Federation
Alexey N. Ermakov – Institute of Solid State Chemistry Pervomaiskaya Street, 91, Ekaterinburg, 620990
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For citations:
Avdeeva Yu.A., Luzhkova I.V., Murzakaev A.M., Ermakov A.N. Formation 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 molybdenum. Nanosystems: Physics, Chemistry, Mathematics. 2024;15(4):530-539. https://doi.org/10.17586/2220-8054-2024-15-4-530-539
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