Characterization of spherical AlSi10Mg powder produced by double-nozzle gas atomization using different parameters

双喷嘴气雾化技术制备球形AlSi10Mg粉末及其表征（英文）

A self-developed double-nozzle gas atomization technique was used to produce AlSi10Mg powder.Effects of delivery tube diameter,gas pressure,and melt superheat on powder characteristics were investigated.The concepts of bluntness and outgrowth were introduced to analyze powder sphericity and satellite index quantitatively.The results showed that the median diameters of all atomized powders ranged from 25 to 33μm.The highest yield rate(72.13%)of fine powder(<50μm)was obtained at a superheat of 350 K.The powder size decreased with increasing melt superheat but increased with increasing delivery tube diameter.Powders with bluntness values between 96%and 98%accounted for over 60%.The outgrowth values demonstrated that 70%-85%of all powders did not contain satellite particles,with few powders adhered two or three particles.Not only Al and Si phases were present but also a metastable Al9Si phase was detected.

采用自行研制的双喷嘴气雾化技术制备AlSi10Mg合金粉末,研究导液管直径、雾化压力、熔体过热度对粉末特性的影响,引入钝度和赘生物指数概念来表征粉末球形度和卫星粉。结果表明:所制备粉末的粒径中值在25～33μm范围内,在过热度为350 K条件下,细粉(<50μm)收得率最高达到72.13%。粉末粒度随着熔体过热度的增大而减小,随着导液管直径的增大而增大。钝度值为96%～98%的粉末占总体的60%以上。所有批次的粉末赘生物指数表明:70%～85%的粉末没有粘连卫星颗粒,只有极少量粉末粘连2个或者3个卫星颗粒。粉末组织中除Al和Si相存在外,还有亚稳态的Al9Si相生成。