Preparation of Al52Sn28Bi20 particles with morphology-controlled core–shell structure by the pulsated orifice ejection method

Abstract

The core–shell structure is commonly found in immiscible alloy droplets, but their formation route is hindered by the uncontrollable thermal history of droplets prepared through traditional methods. To address this issue, the pulsated orifice ejection method was used to prepare core–shell structure particles with a consistent thermal history. Our study identified a formation route for core–shell structures, wherein the second phase of the outer layer of the particle migrates and coalesces to form the core. It was found that the step time of the pulsated orifice ejection method strongly influenced the final morphology. These findings have significant implications for understanding the formation mechanism of core–shell structures.