Laser installations for the production of oxide nanopowders using a powerful laser.
Laser installations for the production of oxide nanopowders using a powerful laser.
The operation of the units is based on the evaporation of the target of the required chemical composition with a powerful laser and the subsequent condensation of vapor in the buffer gas stream. For the evaporation of targets can be used available in the laboratory pulsed-periodic CO2 laser "LAERT" (λ = 10.6 microns) or continuous fiber ytterbium laser LS-07N (λ = 10.6 microns) production of OOO NTO "IRE-Polus".
Laser installations for the production of nanopowders
The installation includes the following primary devices:
Evaporative chamber with optics for input and focusing of laser radiation and with mechanical drive for moving the target in horizontal and vertical directions;
Cyclone for trapping from the gas stream of the fragments of the target and splattered droplets of micron-sized molten;
The electrostatic precipitator or baghouse for the capture and collection of nanoparticles;
Device for pumping a buffer gas;
Filters to trap dust at the entrance to the installation and final clean gas at the outlet.
Main technical characteristics:
Buffer gas : air, N2, Ar, He;
Buffer gas pressure in the evaporation chamber is atmospheric one;
The volumetric flow rate of the buffer gas is 5-6 m3/h;
The performance and energy consumption of nanopowder production depends on the optical and thermal properties of the evaporated material and the energy parameters of the laser. For various oxides at an average laser power of 300-600W, they can be 3-300 g/h and 2-100 (W·h/g), respectively.
Advantages:
Weak agglomeration and high homogeneity of the particle composition in the nanopowder;
Nanoparticles have almost spherical shape or regular cut;
The possibility of obtaining nanopowders of complex oxides by evaporation of a mechanical mixture of simple oxides, the formation of a complex oxide occurs directly in the formation of nanoparticles in the laser plume;
Possibility to choose the wavelength of laser radiation (10.6 µm or 1.07 µm) in order to increase the productivity of nanopowder production and improve its properties.
