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A study on the effect of binder properties on feedstock and micro powder injection molding process  

Lee, Won-sik (Advanced Process and Materials R&D Group, Korea Institute of Industrial Technology)
Kim, Yong-dae (Mold & Die R&D Group, Korea Institute of Industrial Technology)
Publication Information
Design & Manufacturing / v.11, no.3, 2017 , pp. 1-7 More about this Journal
Abstract
The fabrication process of micro pattern structure with high precision and high aspect ratio using powder injection molding (PIM) is developed. In the PIM process, the metal powder is mixed with the binder systems and the mixture is injected into the metal mold. The injection molded green parts are debinded and sintered to reach final shape and properties. In this method, the optimization of physical properties such as fluidity and strength of the binder system is essential for perfect filling the high aspect ratio micro-pattern. For this purpose, the correlation between the properties of the binder system and feedstock and ${\mu}-PIM$ process was investigated, and a binder system with low viscosity at low temperature(about $110^{\circ}C$) and high strength after cooling was investigated and applied. Employing this process, high precision parts with line type micro pattern structure which has pattern size $160{\mu}m$ and aspect ratio more than 2 can be manufactured.
Keywords
Binder; Feedstock; Fluidity; Micro pattern; Powder injection Molding; Strength;
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