Mold filling simulation and experimental investigation of metallic feedstock used in low-pressure powder injection molding

2021 ◽  
Author(s):  
Mohamed Azzouni ◽  
Vincent Demers ◽  
Louis Dufresne
Keyword(s):  
Experimental Investigation ◽  
Injection Molding ◽  
Low Pressure ◽  
Mold Filling ◽  
Powder Injection Molding ◽  
Powder Injection ◽  
Filling Simulation

Numerical simulation and experimental investigation of mold filling and segregation in low-pressure powder injection molding of metallic feedstock

2020 ◽  
Vol 31 (3) ◽  
pp. 1349-1358 ◽  
Author(s):  
Mohamed Aziz Ben Trad ◽  
Vincent Demers ◽  
Raphaël Côté ◽  
Mehran Sardarian ◽  
Louis Dufresne
Keyword(s):  
Numerical Simulation ◽  
Experimental Investigation ◽  
Injection Molding ◽  
Low Pressure ◽  
Mold Filling ◽  
Powder Injection Molding ◽  
Powder Injection

scholarly journals Molding Properties of Inconel 718 Feedstocks Used in Low-Pressure Powder Injection Molding

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Fouad Fareh ◽  
Vincent Demers ◽  
Nicole R. Demarquette ◽  
Sylvain Turenne ◽  
Orlando Scalzo
Keyword(s):  
Shear Rate ◽  
Injection Molding ◽  
Inconel 718 ◽  
Rate Sensitivity ◽  
Low Pressure ◽  
Powder Injection Molding ◽  
Powder Injection ◽  
Sensitivity Index ◽  
High Shear Rates ◽  
The Impact

The impact of binders and temperature on the rheological properties of feedstocks used in low-pressure powder injection molding was investigated. Experiments were conducted on different feedstock formulations obtained by mixing Inconel 718 powder with wax-based binder systems. The shear rate sensitivity index and the activation energy were used to study the degree of dependence of shear rate and temperature on the viscosity of the feedstocks. The injection performance of feedstocks was then evaluated using an analytical moldability model. The results indicated that the viscosity profiles of feedstocks depend significantly on the binder constituents, and the secondary binder constituents play an important role in the rheological behavior (pseudoplastic or near-Newtonian) exhibited by the feedstock formulations. Viscosity values as low as 0.06 to 2.9 Pa·s were measured at high shear rates and high temperatures. The results indicate that a feedstock containing a surfactant agent exhibits the best moldability characteristics.

Threshold Concentration of Surfactant Agent in Feedstocks Used for Low-Pressure Powder Injection Molding

2020 ◽  
Vol 9 (4) ◽  
pp. 20190149 ◽  
Author(s):  
Ghalya Ali ◽  
Vincent Demers ◽  
Raphaël Côté ◽  
Nicole R. Demarquette
Keyword(s):  
Injection Molding ◽  
Low Pressure ◽  
Threshold Concentration ◽  
Powder Injection Molding ◽  
Powder Injection

SIMULATION OF MOLD FILLING IN POWDER INJECTION MOLDING

Equipment ◽  
2006 ◽  
Author(s):  
S. K. Samanta ◽  
H. Chattopadhyay ◽  
M. M. Godkhindi ◽  
B. Pustal ◽  
R. Berger ◽  
...  
Keyword(s):  
Injection Molding ◽  
Mold Filling ◽  
Powder Injection Molding ◽  
Powder Injection

Modeling of mold filling process for powder injection molding

1991 ◽  
Vol 31 (15) ◽  
pp. 1137-1148 ◽  
Author(s):  
Liaquat Ali Najmi ◽  
Daeyong Lee
Keyword(s):  
Injection Molding ◽  
Mold Filling ◽  
Powder Injection Molding ◽  
Powder Injection ◽  
Filling Process

Study on Binder System for Micro Powder Injection Molding of ZrO2 Ceramic

2012 ◽  
Vol 706-709 ◽  
pp. 1948-1954
Author(s):  
Lin Liu ◽  
X.L. Ni ◽  
Hai Qing Yin ◽  
Xuan Hui Qu
Keyword(s):  
Injection Molding ◽  
Large Scale ◽  
Dimensional Accuracy ◽  
Mold Filling ◽  
Powder Injection Molding ◽  
Powder Injection ◽  
Scale Production ◽  
Binder System ◽  
Widespread Application ◽  
Debinding Process

Micro powder injection molding has been accepted as a potential forming technology for large-scale production of miniature components in industries. However, mold filling capability is often poor due to the blind hole structure of the die cavity, which restricts the widespread application of this technique. In this paper, ZrO2 micro gears with addendum circle ranging from 900μm to 200μm were studied. Instead of using traditional PW-HDPE-SA binder as in powder injection molding, thermoplastic binder system is optimized here for better replication of micro gear. It is found that the dimensional accuracy and demold after injection molding can be improved by utilizing proper binder system. ZrO2 feedstock with a powder loading of 46vol.% and the binder system consisting of BW, HDPE and SA was successfully injection molded and demolded, which indicates good mold filling capability and sufficient demolding strength. The binder system was successfully removed by debinding process in two steps, solvent debinding followed by thermal debinding. Debound components free of defects were obtained. Keywords: Micro powder injection molding, ZrO2 feedstock, Binder system, Molding filling capability, Demolding strength

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