CC BY
3*
ALT'23
The 30th International Conference on Advanced Laser Technologies
LM-O-19
High efficient laser method of powder production
Yu.Chivel
1-Additive Technologies Lab , 22019 Minsk,Belarus Merphotonics ,42100 Saint Etienne,France
email address: [email protected]
A process of laser gas atomization has been developed [1] to obtain a spherical metal powder with a particle size of 30-100 ^m using laser beams of conical geometry.
A process is presented for obtaining a spherical powder in a wide size range of 50 nm - 100 ^m, in which a continuous optical discharge in laser cavity [2] with a temperature of 20 kK is formed using conical laser beams in an inert gas flow, into which the material is introduced in the form of a wire or a powder flow. Particle condensation is strongly and rapidly quenched by the inert gas flow, resulting in high supersaturation.
Fig.1 a - System for laser gas atomization; b- Productivity of the powder production process depending on the power density of laser radiation. * - evaporation of eight 1 mm wires; ^-optical atomization of 2 mm wire.
b
a
The efficiency of the proposed laser method for producing powders is up to 0.5 kg/kWh at an electric power of 16 kW, while the existing, most efficient methods of plasma and gas spraying provide an efficiency of no better than 0.1-0.25 kg/h kW. The method can be used to obtain powders from various materials - metals, ceramics, plastics, suspensions.
The process of formation of nanoparticles by means of inert gaseous condensation of metal vapors obtained by laser evaporation of a micropowder flow of 40-60 ^m with a particle concentration of 104-106 cm-3 has been studied. The resulting nanoparticles with a size of 20-50 nm are collected in the form of conglomerates up to 100 nm in size. The productivity of the process reaches 0.2 kg/kWh.
1. Yu.Chivel . New approach to powder production using conical laser beams // In: Proceedings WORLD PM 22 , 5371750, Lyon (2022). 2 . Yu.Chivel .Continuous optical discharge in laser cavity // Tech. Phys. Journ., 86, pp.150 -152 (2016).
