DROPLET-BY-DROPLET CENTRIFUGAL ATOMIZATION MANNER-BASED DEVICE AND METHOD FOR EFFICIENTLY PREPARING LOW-MELTING-POINT SPHERICAL METAL POWDERS

摘要

A droplet-by-droplet (14) centrifugal atomization manner-based device and method for efficiently preparing low-melting-point spherical metal powders (10). Said device comprises a housing (12), and a crucible (4) and a powder collection area which are provided in the housing (12); a rotary disc (8) is of an embedded structure, a main body thereof being made of a material with poor thermal conductivity, an atomization flat surface (23) is made of a metal material with a wetting angle thereof with the droplet (14) being less than 90°; a vent hole (24) is provided along the axis of the rotary disc (8) to improve the stability of the disc during rotation; and an induction heating coil (13) is provided outside the rotary disc (8). By combining the pulse micropore ejection manner and the centrifugal atomization manner, fitting with the structure of the rotary disc (8) and performing induction heating on the surface of the rotary disc (8), the present invention makes a breakthrough in the conventional molten metal discretization manner of a metal liquid, achieves the fibrous discretization manner which is achieved only when the atomization medium is an aqueous solution or organic solution, makes leaps in progress in ultra-fineness, and produces low-melting-point ultra-fine spherical metal powders that satisfy use requirements, are highly spherical and have good mobility and spreadability, without causing satellite droplet.