11 research outputs found
Particular Characteristics of the Synthesis of Titanium Nitride Nanopowders in the Plasma of Low Pressure Arc Discharge
The method of producing TiN nanopowders in the plasma of low pressure arc discharge in nitrogen atmosphere is discussed. The influence of gas pressure on nanopowder dispersion is studied. It is shown that the particles have nanometer size and a narrow particle size distribution
The investigation of the influence of oxygen concentration in the gas mixture on nanodispersed oxides synthesis
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 of increasing the gas pressure in the range of p = 10-3 β 1 Pa. Dissipation of energy of ions and electrons on gas molecules leads to rapidly heating 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
The influence of magnetic field on the rate of cathode erosion at vacuum arc spraying
The influence of the magnetic field in the cathode space on the synthesis of metal oxide nanopowders by vacuum-arc spraying was studied. It was found that, depending on the geometry of the magnetic field and the pressure of gaseous medium in plasma-chemical reactor, particular conditions which enhance the efficiency of CuO synthesis, appear
The investigation of the influence of oxygen concentration in the gas mixture on nanodispersed oxides synthesis
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 β 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
Particular Characteristics of the Synthesis of Titanium Nitride
The method of producing TiN nanopowders in the plasma of low
pressure arc discharge in nitrogen atmosphere is discussed. The influence of
gas pressure on nanopowder dispersion is studied. It is shown that the particles
have nanometer size and a narrow particle size distribution
The influence of magnetic field on the rate of cathode erosion at vacuum arc spraying
The influence of the magnetic field in the cathode space on the
synthesis of metal oxide nanopowders by vacuum-arc spraying was studied. It
was found that, depending on the geometry of the magnetic field and the
pressure of gaseous medium in plasma-chemical reactor, particular conditions
which enhance the efficiency of CuO synthesis, appear