Eopaton Electrical Welding Institute Of The Nas Of Ukraine

Kiev, Ukraine

Eopaton Electrical Welding Institute Of The Nas Of Ukraine

Kiev, Ukraine
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Kurapov Y.A.,Eopaton Electrical Welding Institute Of The Nas Of Ukraine | Litvin S.E.,Eopaton Electrical Welding Institute Of The Nas Of Ukraine | Romanenko S.M.,Eopaton Electrical Welding Institute Of The Nas Of Ukraine | Didikin G.G.,Eopaton Electrical Welding Institute Of The Nas Of Ukraine | Oranskaya E.I.,Chuiko Institute of Surface Chemistry of NAS of Ukraine
Materials Research Express | Year: 2017

The paper gives the results of studying the structure of porous condensates of Fe+NaCl composition, chemical and phase compositions and dimensions of nanoparticles produced from the vapor phase by EB-PVD. Iron nanoparticles at fast removal from the vacuum oxidize in air and possess significant sorption capacity relative to oxygen and moisture. At heating in air, reduction of porous condensate weight occurs right to the temperature of 650 °C, primarily, due to desorption of physically sorbed moisture. Final oxidation of Fe3O4 to Fe2O3 proceeds in the range of 380 °C-650 °C, due to the remaining fraction of physically adsorbed oxygen. At iron concentrations of up to 10-15 at%, condensate sorption capacity is markedly increased with increase of iron concentration, i.e. of the quantity of fine particles. Increase of condensation temperature is accompanied by increase of nanoparticle size, resulting in a considerable reduction of the total area of nanoparticle surface, and, hence of their sorption capacity. In addition to condensation temperature, the size and phase composition of nanoparticles can also be controlled by heat treatment of initial condensate, produced at low condensation temperatures. Magnetite nanoparticles can be transferred into stable colloid systems. © 2017 IOP Publishing Ltd.


Kharlamov M.Y.,Eopaton Electrical Welding Institute Of The Nas Of Ukraine | Krivtsun I.V.,Eopaton Electrical Welding Institute Of The Nas Of Ukraine | Korzhyk V.N.,Eopaton Electrical Welding Institute Of The Nas Of Ukraine | Ryabovolyk Y.V.,Eopaton Electrical Welding Institute Of The Nas Of Ukraine | Demyanov O.I.,Eopaton Electrical Welding Institute Of The Nas Of Ukraine
Journal of Thermal Spray Technology | Year: 2015

The mathematical model for the process of plasma-arc wire spraying is proposed, which describes behavior of molten metal droplets in the plasma jet, allowing for the processes of their deformation and gas-dynamic breakup. Numerical analysis of the processes of motion, heating, and breakup of molten metal droplets, detached from the sprayed wire at plasma-arc spraying of coatings, was performed. It is shown that during molten droplets movement in the plasma jet their multiple breakup takes place, leading to formation of sprayed particles with dimensions much smaller than dimensions of initial droplets, detached from the sprayed wire tip. © 2015, ASM International.

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