Device for preparing metal ultrafine powder and its method

Abstract

The superfine metal powder preparing apparatus and method adopts double-layered composite atomizing nozzle and bipolar atomizing mode. The double-layered composite atomizing nozzle has one upper layer in traditional atomizing structure and one lower layer in Laval nozzle structure and has double-layered metal liquid tearing effect and ultrasonic metal liquid exciting effect. The present invention also adopts doped powder and vortex structure and thus has homogeneous mixing between solid and gas, vortex gas flow impulse and increased gas flow impact force on metal liquid for deep tearing of metal liquid and even small grains. In addition, present invention has increased electric field to make the falling metal powder produce surface charge effect to avoid agglomeration.

Description

technical field [0001] The invention belongs to the fields of metallurgy, materials and engineering, and in particular relates to a device and method for preparing metal ultrafine powder. technical background [0002] The two-flow atomization method of metal liquid flow is a common method for preparing metal powder. At present, using the traditional single-layer two-flow atomization device, the average particle size of the powder that can be produced is 10-30 μm. Chinese patent CN200420023889.7 invented a high-pressure gas atomizing nozzle for the preparation of metal powder materials. This invention uses the wall surface of the outer cavity wall of the gas cavity and the wall surface of the inner cavity wall to form a Laval nozzle structure, and uses The high-pressure gas atomizes the metal liquid flow. The feature of this device is that it can be adapted to the powder preparation of high melting point materials. The average particle size of the prepared powder is above 10...

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Problems solved by technology

Chinese patent CN200420023889.7 invented a high-pressure gas atomizing nozzle for the preparation of metal powder materials. This invention uses the wall surface of the outer cavity wall of the gas cavity and the wall surface of the inner cavity wall to form a Laval nozzle structure, and uses The high-pressure gas atomizes the metal liquid flow. The feature of this device is that it can be adapted to the powder preparation of high melting point materials. The average particle size of the prepared powder is above 10 μm, and the energy consumption is also relatively large.

Chinese patent CN01106868.X invented a solid atomization method for liquid metal and alloy, which is characterized by finer particle size and narrow powder particle size distribution compared with traditional two-flow atomization powder, and the prepared metal tin powder The average particle size is 36.69μm, but the particle size of the powder prepared by high-pressure gas atomization powder is larger

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