Volume 20, Issue 4 (April 2020)                   Modares Mechanical Engineering 2020, 20(4): 1079-1088 | Back to browse issues page

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Askari A, Alaei M, Mehdipoor Omrani A, Nekouee K. Critical Powder Volume Concentration (CPVC) of Fe-2Ni low-Alloy Steel Powder and Selection of a Proper Binder System from Rheological Point of View in order to Metal Injection Molding. Modares Mechanical Engineering 2020; 20 (4) :1079-1088
URL: http://mme.modares.ac.ir/article-15-32453-en.html
1- Department of Mechanical Engineering, NazarAbad Center, Karaj Branch, Islamic Azad University, Karaj, Iran , ali.askari@kiau.ac.ir
2- Center of Composite Materials, Faculty of Materials & Manufacturing Technology, Malek Ashtar University of Technology, Tehran, Iran
3- Mechanical Engineering Department, Materials & Manufacturing Technologies Faculty, Malek Ashtar University of Technology, Tehran, Iran
Abstract:   (1867 Views)

Metal Injection Molding (MIM) is a novel manufacturing technology, used for complex geometric parts at a high production rate. One of the most important parameters in this method is the selection of proper feedstock consisting of optimal powder loading and an optimized binder system. The defects, which appear during the injection process, cannot be removed in later process stages and this is for the reason that the rheological behavior of the feedstock needs to be checked to make sure that it has the required injection properties. In this study, a multi-component wax-based binder system has been selected in order to inject Fe-2Ni powder. For this reason, a multi-component wax-based binder system with different percentages of constituents was used to produce 11 feed modes containing 60% vol. % of the powder. Further, the viscosity and its variation with the shear rate for 11 developed samples have been measured. The results showed that the feedstock consisting of 66 vol. % Paraffin wax, 19 vol. % Polypropylene, 10 vol. % Carnauba wax and 5 vol. % Stearic Acid has the lowest viscosity and lowest sensitivity to the shear rate and this leads to the complete filling of the mold cavity and production of a healthy component for very complex geometries. After achieving the proper binder system, the critical powder loading for the binder system was measured by 58 vol. % using torque rheometer.
 

Full-Text [PDF 1004 kb]   (891 Downloads)    
Article Type: Original Research | Subject: Metal Forming
Received: 2019/05/8 | Accepted: 2019/08/26 | Published: 2020/04/17

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