Parameters of formation of coatings obtained by detonation spraying of spherical titanium on concrete

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The possibility of obtaining photocatalytic coatings by detonation spraying on a concrete substrate is considered. A study was conducted to select the optimal parameters for detonation spraying of titanium spherical powder on the surface of heavy concrete. The analysis of the results of experimental studies of a series of 25 concrete samples with coatings obtained at different spraying parameters was performed using X-ray phase analysis and evaluation of photocatalytic activity by the degree of degradation of methylene blue in the solution. The presence of four phases in the coatings was established: titanium, anatase, rutile and titanium monoxide. It was found that at spraying distances less than 100 mm and speeds less than 1000 mm/min, the process becomes unstable, causing destruction of the concrete surface layer due to dehydration of crystal hydrates. Increasing the spraying distance to more than 130 mm and speeds more than 1600 mm/min helps to reduce the content of anatase and rutile due to a decrease in the thermal effect of the detonation process. A correlation was found between the increase in the content of these phases and the enhancement of photocatalytic activity, which is consistent with the data on the effect of phase composition on the photocatalytic properties of materials. A rational spraying mode was established – the distance to the substrate is 120 mm, the spraying speed is 1500 mm/min.

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作者简介

D. Podgornyi

Belgorod State Technological University named after V.G. Shukhov

编辑信件的主要联系方式.
Email: dan_podgor@mail.ru

Postgraduate Student 

俄罗斯联邦, 308012, Belgorod, Kostyukova str., 46

D. Bondarenko

Belgorod State Technological University named after V.G. Shukhov

Email: di_bondarenko@mail.ru

Candidate of Sciences (Engineering) 

俄罗斯联邦, 308012, Belgorod, Kostyukova str., 46

V. Strokova

Belgorod State Technological University named after V.G. Shukhov

Email: vvstrokova@gmail.com

Doctor of Sciences (Engineering) 

俄罗斯联邦, 308012, Belgorod, Kostyukova str., 46

V. Sirota

Belgorod State Technological University named after V.G. Shukhov

Email: zmas36@mail.ru

Candidate of Sciences (Physical and Mathematical) 

俄罗斯联邦, 308012, Belgorod, Kostyukova str., 46

D. Prokhorenkov

Belgorod State Technological University named after V.G. Shukhov

Email: dmpro@rambler.ru

Postgraduate Student

俄罗斯联邦, 308012, Belgorod, Kostyukova str., 46

参考

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2. Fig. 1. Coatings obtained by detonation spraying of titanium powder on a concrete substrate under different spraying modes (distance/speed): a – original sample; b – sample after sandblasting; c – 40/400; d – 40/800; e – 60/800; f – 80/800; g – 100/800; h – 120/1000; i – 120/1000 (after sandblasting)

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3. Fig. 2. Surface structure of concrete sample before (a) and after (b) spraying the coating

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4. Fig. 3. Surface structure of concrete sample with preliminary sandblasting (a) and after (b) spraying of coating

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5. Fig. 4. Ti–TiOx coatings obtained by detonation spraying of metallic titanium under different conditions

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6. Fig. 5. X-ray phase spectra of coatings, grouped into series by spraying speed 1000–2000 mm/min with a step of 250 with a difference by spraying distance (d): a – d=120 mm; b – d=140 mm; c – d=160 mm; d – d=180 mm; e – d=200 mm

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7. Fig. 6. Heat maps of X-ray phase analysis results depending on the spraying mode, content: a – titanium; b – anatase; c – rutile; d – TiO

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8. Fig. 7. Heat map of the results of the study of photocatalytic effect from the spraying

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