超重力场对Al-17Si-4.5Cu熔体中固相夹杂分离的影响

Effects of Super-gravity Field on Separation of Solid Inclusions in Al-17Si-4.5Cu Melt

将Al-17Si-4.5Cu熔体中初生Si颗粒模拟为固相夹杂物,利用超重力场恒温分离与受力分析、理论计算的方法研究熔体内部夹杂颗粒在不同重力场中的定向分离行为。结果表明,超重力场可以有效强化铝熔体中夹杂物的定向分离效果,且重力系数越大,Si颗粒分离效果越好。在普通重力场(G=1)条件下,直径为30μm的Si颗粒平衡运动速度为6.08×10-5 m/s,Si颗粒的分离效率仅为11.01%;而当超重力场G=500时,Si颗粒的运动速度为3.04×10-2 m/s,Si颗粒的分离效率达到了71.91%。

The primary silicon particles in Al-17 Si-4.5 Cu melt were simulated as solid inclusions in the molten metal.Isothermal separation of inclusion particles from the melt was performed with super-gravity field,and force analysis and theoretical calculation of the particles were also investigated to understand the directional separation behaviors of solid particles in the melt under different gravity fields.The results reveal that,the supergravity field can enhance greatly the effect of directional separation of inclusion particles in the melt.Besides,the separating effect of the primary silicon becomes more desirable with the increase of the gravity coefficient.When the gravity coefficient G=1,the balanced moving velocity of the silicon particle with diameter of 30μm is 6.08×10-5 m/s,and the separation efficiency of the particle is merely 11.01%.However,under the condition of G=500,the moving velocity of the particle reaches 3.04×10-2 m/s,and the separation efficiency can reach up to71.91%.