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谢兴铖,曹瑞军,李增德,周增林,李卿,李悦,贾斌.大长径比超细WC-Co圆棒PIM充模过程的数值模拟[J].稀有金属材料与工程(英文),2021,50(1):160~166.[Xie Xingcheng,Cao Ruijun,Li Zengde,Zhou Zenglin,Li Qing,Li Yue and Jia Bin.Numerical Simulation of PIM Filling Process of Ultra-fine WC-Co Round Bar with Large Aspect Ratio[J].Rare Metal Materials and Engineering,2021,50(1):160~166.]
Numerical Simulation of PIM Filling Process of Ultra-fine WC-Co Round Bar with Large Aspect Ratio
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Received:January 07, 2020  
DOI:
Key words: Two-fluid model  Ultra-fine WC/10Co  Filling process  Numerical simulation
Foundation item:国家重点研发计划专项项目(2017YFB0306000);有研科技集团有限公司青年基金资助项目(66271907);有研科技集团有限公司科技创新基金天使研究项目(2019TS0102)
Author NameAffiliation
Xie Xingcheng,Cao Ruijun,Li Zengde,Zhou Zenglin,Li Qing,Li Yue and Jia Bin  
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Abstract:
      Based on the powder-binder two-fluid model, the filling process was simulated by CFX commercial software, especially for the ultra-fine WC/10Co round bar with large aspect ratio by powder injection molding (PIM). The results indicated that the numerical simulation results are almost consistent with the experimental filling process, which proves that the hypothesis and parameter settings are reasonable and the two-fluid model is feasible. Also there is no great difference in temperature distribution between powder and binder. There is no solidification for melting feedstock, which due to that the lowest temperature valued 330 K of melting feedstock is higher than the vitrification temperature of binder. In addition, there is great difference in the viscosity between powder and binder, valued 50.0 ~379.4 Pa·s, 2.9~9.2 Pa·s, respectively, which is one cause for segregation. Finally, it is also another main cause for segregation that the relative velocity difference between powder and binder increases up remarkably, such as 0.2% up 1.8% from gate to die wall, 0.1% up 1.6% from gate to far end.