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

TitleThe features of NiCx (x ⩽ 0.33) phase formation at the mechanochemical alloying of Ni-CNT and Ni-graphite mixtures
Publication TypeJournal Article
Year of Publication2020
AuthorsNakonechna, ОІ, Belyavina, NN, Ivanenko, KO, Kuryliuk, AM, Dusheiko, MG, Makara, VA
Abbreviated Key TitleDopov. Nac. akad. nauk Ukr.
SectionMaterials Science
Date Published3/2020

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.

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

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