Phase Behaviors in Bi-phase Simulation of Powder Segregation in Metal Injection Molding

Baosheng Liu; Fan Xiao-xin; Cheng Zhi-qiang

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Phase Behaviors in Bi-phase Simulation of Powder Segregation in Metal Injection Molding

Baosheng Liu *,Fan Xiao-xin #,Cheng Zhi-qiang

Southwest Jiaotong University

*Correspondence author

#Submitted by

Subject:

Funding: 教育部博士点基金（No.20020613005）

Opened online:26 December 2005

Accepted by: none

Citation: Baosheng Liu,Fan Xiao-xin,Cheng Zhi-qiang.Phase Behaviors in Bi-phase Simulation of Powder Segregation in Metal Injection Molding[OL]. [26 December 2005] http://en.paper.edu.cn/en_releasepaper/content/4631

Powder segregation induced by mold filling is an important phenomenon to affect the final quality of Metal Injection Molding (MIM). The prediction of segregation in MIM requires a bi-phase flow model to describe distinctly the flows of metallic powder and polymer binder. Viscous behaviors for the flows of each phase should hence be determined. The coefficient of interaction between the flows of two phases should also be evaluated. However, only viscosity of the mixed feedstock is measurable by the capillary tests. Wall sticking is supposed in the traditional model for capillary tests, while the wall slip is important to be taken into account in MIM injection. Objective of the present paper is to introduce the slip effect in bi-phase simulation, and search the suitable way to determine the viscous behaviors for each phase with the consideration of wall slip in capillary tests. Analytical and numerical methods are proposed to realize such a specific purpose. The proposed method is based on the mass conservation between the capillary flows in mono-phase model for the mixed feedstock and in bi-phase model for the flows of two phases. Examples of the bi-phase simulation in MIM are realized with the software developed by research team. The results show evident segregation, which is valuable for improving the mould designs.

Keywords:Viscous behaviors; Bi-phases simulation; Powder segregation; Metal injection molding; Wall slip

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