The investigation of the influence of oxygen concentration in the gas mixture on nanodispersed oxides synthesis

20th International Scientific Conference Reshetnev Readings-2016

Karpov, I.V.^1,2 ; Ushakov, A.V.^1,2 ; Lepeshev, A.A.^1,2 ; Fedorov, L. Yu^1,2 ; Dorozhkina, E.A.^3 ; Karpova, O.N.^3 ; Shaikhadinov, A.A.^1,2 ; Demin, V.G.^1,2 ; Bachurina, E.P.^1,2 ; Lichargin, D.V.^1 ; Abkaryan, A.K.^2 ; Zeer, G.M.^2 ; Zharkov, S.M.^2,4

Federal Research Center, Krasnoyarsk Scientific Center, Russian Academy of Sciences, Krasnoyarsk

660036, Russia^1

Siberian Federal University, Krasnoyarsk

660041, Russia^2

Reshetnev Siberian State University of Science and Technology, Krasnoyarsk

660037, Russia^3

Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Russia^4

关键词: Average particle size;    Cathode process;    Discharge gaps;    Energy of ions;    Influence of oxygen;    Low pressure arc;    Oxides synthesis;    Superheated gas;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/255/1/012008/pdf
DOI  :  10.1088/1757-899X/255/1/012008

来源: IOP

【 摘 要 】

Thermal effects in cathode space of low-pressure arc discharge, which contribute to the synthesis of nanopowders with an average particle size of less than 10 nm, are considered. One of the most important parameters, characterizing the cathode processes of vacuum arc, is a voltage drop across the discharge gap. All the gases demonstrate a decrease of a voltage drop across the discharge gap under the condition ofincreasing the gas pressure in the range of p = 10-3- 1 Pa. Dissipation of energy of ions and electrons on gas molecules causes abrupt heating of the gas. Heat, coming from gas plasma, has a significant impact on evaporating material of a cathode. It can be assumed that a microdrop fraction, formed as a result of a cathode spraying in a liquid phase, will further evaporate in a superheated gas.