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Functional plasma-deposited coatings

Pashechko M., Kindrachuk M., Gumeniuk I., Tisov O., Zahrebelniy V.

Advances in Science and Technology. Research Journal

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2017

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Vol. 11, no 4

301--304

EN

The paper focuses on the problem of low adhesion of plasma sprayed coatings to the substrate. The subsequent laser treatment modes and their influence on the coating-substrate interface were studied. This allows to decrease the level of met-stability of the coating, thus decreasing its hardness down to 11–12 GPa on the surface and to about 9 GPa on depth of 400 μm. The redistribution of alloying elements through solid and liquid diffusion improves mechanical properties and rises the adhesion up to 450 MPa after remelting and up to 90–110 MPa after laser-aided thermal cycling. At the same time, remelting of coating helps to decrease its porosity down to 1%. The obtained complex of properties also allows to improve wear resistance of coatings and to decrease friction factor.

2

Effect of impulse bias potential to formation of wear-proof coating deposited from plasma fluxes

Breus A., Pavlenko V.

Zeszyty Naukowe. Transport / Politechnika Śląska

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2016

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z. 92

17--22

EN

Plasma-based technology is used to deposit a wear-proof nanostructured coating on plunger tappets of pump of aviation oil system block, which allows increasing the life of the parts up to 3–5 times. For the nanostructured coatings, which are formed at the impulse bias supply, the electric field strength is 103 -104 times greater than for the microstructured coatings. It results in significant change of activation energy of the process of strong bond formation in the growing coating, which makes it possible to obtain high qualitative characteristics of the coating.

3

Wpływ podłoża na właściwości dielektryczne plazmowych pokryć węglowych

Pospieszna J., Jaroszewski M., Szafran G.

Przegląd Elektrotechniczny

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2010

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R. 86, nr 11b

308-310

PL

W procesie nakładania cienkich pokryć węglowych na powierzchnię wybranych włóknin polimerowych zastosowano metodę niskotemperaturowej plazmy wyładowań jarzeniowych. Stwierdzono, że o konduktancji powierzchniowej nakładanej warstwy węglowej decyduje przede wszystkim struktura powierzchni podłoża, która zależy zarówno od rodzaju materiału włókniny, jak i jej gramatury.

EN

In the process of putting thin layer carbon coatings onto the selected nonwoven fabrics the method of low temperature glow discharges plasma was used. It was found out that the morphologic structure which is depends on type and basis weight of the nonwoven fabric has a considerable influence on the surface resistance of carbon films.

4

Germanium oxide thin films fabricated by plasma-assisted chemical vapor deposition

Gubiec K., Uzupis A., Tyczkowski J.

Polish Journal of Applied Chemistry

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2005

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Vol. 49, nr 1-2

33-39

EN

Amorphous hydrogenated germanium oxide films (a-GeXOY:H) fabricated by plasma-assisted chemical vapor deposition (PACVD) from a mixture of oxygen and tetramethylgermane in radio-frequency (13.56 MHz) glow discharge, were investigated. Measurements of electrical conductivity and internal photoemission were carried out. It has been found that the films are amorphous insulators (a-I) with the transport gap of 6.7 eV and the conductivity of the order of 10–14 S/m. To characterize the chemical structure of the films, Raman spectroscopy was used. The main structure of the GeO4 type with low concentration of Ge–Ge and Ge–C bonds has been identified.

5

Laser-produced copper plasmas

Henc-Bartolic V., Kovacevic E., Kunze H.-J., Stubicar M.

Journal of Technical Physics

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2003

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Vol. 44, no 2

153-158

EN

The Cu plasmas were produced by a ruby laser (~ 5 J, 694.3 nm, ~ 18 ns, ~140 GWcm^-2). Time-resolved spectra of the plasmas were observed in the region of 8-24 nm. The electron temperature was estimated to be about 40 eV. A small depth of the crater (~ 3 [my]m) and the surrounding ripples were observed at the Cu target surface. The trace of deposited plasma was explained as the Rayleigh-Taylor instability. Plasma was transparent to the laser beam.