A study of the effect of deposition conditions on the phase-structural state of ion-plasma WC – TiC coatings

Authors

DOI:

https://doi.org/10.15587/1729-4061.2019.181291

Keywords:

quasibinary system, elemental composition, substrate temperature, bias potential, supersaturated solid solution

Abstract

Studies of the influence of thermal and radiation factors on the elemental composition and phase-structural state of WC-TiC ion-plasma condensates of a quasibinary system are presented. As a thermal factor, we used different substrate temperatures during deposition and temperatures of high-temperature annealing of coatings after their deposition. The influence of the radiation factor was changed by applying a negative bias potential of different magnitudes to the substrate during coating deposition. It was found that with a change in the substrate temperature during deposition (in the temperature range 80–950 °C), a change occurs in the elemental composition of the coating. With an increase in the deposition temperature, the relative content of heavy metal atoms W increases and the relative content of Ti and C atoms decreases. At the phase-structural level, this leads to a change from the single-phase state ((W, Ti)C supersaturated solid solution at a deposition temperature of less than 700 °C) to two-phase ((W, Ti)C and α-W2C phases at a deposition temperature of more than 700 °C). The use of high-temperature annealing of coatings after their formation showed a relatively low decay activation efficiency. At an annealing temperature of 800 °C, a noticeable change in the phase-structural state is not observed, and at the highest temperature of 1000 °C and holding for 2 hours, the content of the α-W2C phase is relatively small and does not exceed 15 vol %. The supply of a bias potential stimulates the formation of a two-phase state from (W, Ti)C and α-W2C phases with nanometer crystallite size. With an increase in the bias potential from –50 V to –115 V, the average crystallite size decreases from 4.5 nm to 3.8 nm.

The use of structural engineering methods in the work to create two-phase materials based on a quasibinary WC-TiC system is the basis for increasing the strength and crack resistance of coatings of such systems

Author Biographies

Oleg Sоbоl`, National Technical University "Kharkiv Polytechnic Institute" Kyrpychova str., 2, Kharkiv, Ukraine, 61002

Doctor of Physical and Mathematical Sciences, Professor

Department of Materials Science

Osman Dur, Hacettepe University Technopolis Üniversiteler Mahallesi, 1596, Cadde 6. F-Blok Kat:3 Beytepe, Ankara, Turkey, 06800

Researcher

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Published

2019-10-21

How to Cite

Sоbоl` O., & Dur, O. (2019). A study of the effect of deposition conditions on the phase-structural state of ion-plasma WC – TiC coatings. Eastern-European Journal of Enterprise Technologies, 5(12 (101), 6–13. https://doi.org/10.15587/1729-4061.2019.181291

Issue

Vol. 5 No. 12 (101) (2019): Materials Science

Section

Materials Science

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