Metal evaporating device and method for preparing ultrafine metal powder by using same

Abstract

The invention discloses a metal evaporating device and a method for preparing ultrafine metal powder by using the same. The device comprises a crucible (1), a plasma transferred arc torch (2), a plasma transferred arc (3), a graphite (4), a power supply and a lead, which form an electric loop, wherein an air inlet pipe (2.1) from which air enters, is arranged in the plasma transferred arc torch (2); the plasma transferred arc (3) is arranged between the plasma transferred arc torch (2) and the crucible (1); the graphite (4) is arranged on the bottom of the crucible (1); and a feed pipe (2.2) which is used for feeding metal raw materials is arranged above the plasma transferred arc (3). The structure of the metal evaporating device has the advantages that the energy of the plasma transferred arc is fully utilized, the metal output and the metal evaporating efficiency are increased, the energy consumption is lowered, and the ultrafine metal powder which has uniform particle size and is free from large particle metal residual is acquired.

Description

technical field [0001] The invention discloses a metal evaporation device and a method for preparing ultrafine metal powder by using the device. Background technique [0002] In the process of preparing metal powder by the physical vapor phase method, in order to obtain ultra-fine metal powder (with a particle size of generally 10-1000nm) with a relatively uniform particle size and no large particle metal residues, more plasma transfer arc metal evaporation devices are generally used. to prepare, such as figure 1 As shown, the metal evaporation device generally includes a crucible 1' for containing metal blocks and molten metal liquid, a plasma transfer arc torch 2', a plasma transfer arc 3', and graphite 4'; the plasma The transfer arc torch 2' is set directly above the crucible 1'; the bottom of the crucible 1' is provided with a graphite 4', and a power supply is connected outside the plasma transfer arc torch 2' and the graphite 4' to form an electric circuit through a ...

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Problems solved by technology

[0003] However, this plasma transfer arc metal evaporation device has the following disadvantages: due to the limitation of the heat transfer between the plasma transfer arc and the metal liquid surface, that is, the contact surface between the plasma transfer arc and the metal liquid surface in the crucible is small, resulting in the metal evaporation efficiency. Low, the output of metal vapor is low, the energy consumption is large, and most of the energy of the plasma transfer arc is not fully utilized

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