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ArticleName Characteristics of Ti– Si Coatings on Ti6Al4V Alloy Subjected to Electrospark Granules Deposition
DOI 10.17580/tsm.2019.04.07
ArticleAuthor Burkov А. А., Kulik М. А., Krutikova V. O.

Institute of Materials, Khabarovsk Science Centre, Far Eastern Branch of the Russian Academy of Sciences, Khabarovsk, Russia:

А. А. Burkov, Senior Researcher, e-mail:
М. А. Kulik, Junior Researcher


Kosygin Institute of Tectonics and Geophysics, Far Eastern Branch of the Russian Academy of Sciences, Khabarovsk, Russia:
V. O. Krutikova, Junior Researcher


Ti – Si coatings were obtained by the electrospark treatment of titanium alloy Ti6Al4V in a mixture of titanium granules with crystalline silicon powder. Three mixtures of granules with a silicon content of 1.2; 2.3 and 3.8 wt.% were prepared. The deposition of the coatings was carried out for 10 minutes pulses with energy of 0.33 J and a frequency of 1 kHz. According to X-ray analysis, it was found that titanium silicide Ti5Si3 is observed in the composition of all coatings. Silicide was formed as a result of the exothermic interaction of molten titanium with silicon under the influence of multiple electrical discharges. Titanium silicide Ti5Si3 prevailed in the composition of coatings when using a mixture of granules with silicon content above 2.3 wt. %, which is confirmed by the data of energy dispersive X-ray microanalysis. The thickness of the coating with the highest silicon content reached 50 μm. In the microstructure of this coating, the titanium silicide crystals surrounded by titanium interlayers were observed. Metallography of the cross section of the coatings showed that there are no longitudinal cracks in the coatings and there is no clear boundary between the deposited Ti – Si layer and the substrate. The hardness of Ti –Si coatings increased with an increase in the concentration of silicon in the mixture of granules from 4.9 to 12 GPa, which is 2–4 times higher than that of the Ti6Al4V alloy. The coefficient of friction of the coatings was in the range of 0.65–0.9. Tests for wear at the dry sliding mode showed that Ti – Si coatings had a wear rate ranging from 2.1 to 26.9·10–6 mm3/Nm. Thus, Ti – Si coatings can increase the wear resistance of the Ti6Al4V alloy up to 23 times. The wear rate of the samples at a load of 70 N was higher as compared to 25 N. Testing samples with Ti – Si coatings for resistance to high-temperature corrosion at a temperature of 900 oC for 56 hours showed that the technology of electrospark treatment in a mixture of Ti granules and Si powder can improve the oxidation resistance of the Ti6Al4V alloy up to 18 times.

keywords Ti6Al4V alloy, electrospark granules deposition, silicon powder, titanium silicide Ti5Si3, hardness, wear, friction coefficient, oxidation resistance

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