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
Section: Materials Science
Language: Ukrainian

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

1. Nakonechna, O. I., Dashevskyi, M. M., Boshko, О. І., Zavodyanny, V. V. & Belyavina, N. N. (2019). Effect of carbon nanotubes on mechanochemical synthesis of d-metal carbide nanopowders and nanocomposites. Prog. Phys. Met., 20, No. 1, рр. 1-52. Doi:
2. Nakonechna, О. І., Belyavina, N. N., Dashevskyi, М. М., Kuryliuk, А. М. & Makara, V. A. (2019). Mecha nochemical synthesis of NiCx carbide with the sphalerite-type defect structure. Dopov. Nac. akad. nauk Ukr., No. 4, pp. 50-56 (in Ukrainian). Doi:
3. Portnoi, V. K., Leonov, A. V., Mudretsova, S. N. & Fedotov, S. A. (2010). Formation of nickel carbide in the course of deformation treatment of Ni—C mixtures. Phys. Metals Metallogr., 109, No. 2, pp. 153-161. Doi:
4. Dashevskyi, M., Boshko, О., Nakonechna, O. & Belyavina, N. (2017). Phase transformations in equiatomic Y—Cu powder mixture at mechanical milling. Metallofiz. Noveishie Tekhnol., 39, Nо. 4, pр. 541-552. Doi:
5. Li, Y. B., Wei, B. Q., Liang, J., Yu, Q. & Wu, D. H. (1999). Transformation of carbon nanotubes to nanoparticles by ball milling process. Carbon, 37, pp. 493-497. Doi:
6. Tang, J., Zhao, W., Li, L., Falster, A. U., Simmons, W. B., Zhou, W. L., Ikuhara, Y. & Zhang, H. (1996). Amorphization of graphite induced by mechanical milling and subsequent crystallization of the amorphous carbon upon heat treating. J. Mater. Res., 11, No. 3, pp. 733-738. Doi:
7. Boshko, O., Nakonechna, O., Belyavina, N., Dashevskyi, M. & Revo, S. (2017). Nanocrystalline Fe–C composites obtained by mechanical alloying of iron and carbon nanotubes. Adv. Powder Technol., 28, No. 3, pp. 964-972. Doi: