The features of NiCx (x ⩽ 0.33) phase formation at the mechanochemical alloying of Ni-CNT and Ni-graphite mixtures

Nakonechna, ОІ
Belyavina, NN
Ivanenko, KO
Kuryliuk, AM
Dusheiko, MG
1Makara, VA
1Taras Shevchenko National University of Kyiv
Dopov. Nac. akad. nauk Ukr. 2020, 3:47-54
https://doi.org/10.15407/dopovidi2020.03.047
Section: Materials Science
Language: Ukrainian
Abstract: 

Nanoscaled NiCx carbide (x < 0.33) with a defective cubic structure of the sphalerite type (a = 0.3550) was synthesized in a high-energy ball planetary mill by the mechanical alloying of two different charges: a nickel powder and multiwalled carbon nanotubes (CNT) or a mixture of nickel and graphite powders. The features of the formation of this carbide were revealed on the basis of a complex X-ray study of synthesis products with the use of phase analysis, refinement of the crystalline structure of the phases, the determination of the micr-deformation of the crystal lattice, and residual stresses. As a result, it has been shown that carbon atoms from amorphized CNT, apparently, have a somewhat smaller effective radius than the carbon atoms from amorphous graphite. The Vickers microhardness of HP-HT compacted NiC0.33 (6.9—7.2 GPa) samples was determined. This compact material has been tested as a potential material used in the coating deposition by electron beam technology. Thin films obtained (up to 150 nm) possess a high adhesion to silicon substrate, as well as to a substrate made of fused glass, and high abrasion resistance. These coationgs are characterized by a high thermal stability in the temperature range up to 850 ºC and could be recommended for applications as heat resistant protective coatings.

Keywords: crystal structure of ZnS sphalerite-type, electron beam technology, mechanical alloying, NiCx carbide, thin film, X-ray powder diffraction
References: 

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