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Water Atomised Stainless Steel Powder for Micro Metal Injection Molding: Optimization of Rheological Properties

Ibrahim , M.H.I and Muhamad, N. and Sulong, A.B. and Murtadhahadi, I and Jamaludin, K.R. and Ahmad, S. and Nor, N.H.M (2008) Water Atomised Stainless Steel Powder for Micro Metal Injection Molding: Optimization of Rheological Properties. In: Malaysian Mettallurgical Conference 2008, 3-4 December 2008, Bangi, Selangor.



Nowadays, micro metal injection molding (μMIM) has become among the promising method in powder metallurgy research to produce small-scale intricate part at an effective process and competitive cost for mass production. The feedstock for μMIM requires more stringent characteristics than MIM, based on the perspectives of powder and binder system such as smaller outlet diamater of micro injection molding required more accuracy on the rounded edges by reducing the shrinkage effect. Research on μMIM method is still under development where some technological aspects need to be considered for example the performance of feedstock by investigating the rheological characteristics. In this study, stainless steel SS316L powder are mixed with composite binder, which consists of PEG (Polyethelena Glycol), PMMA (Polymethyl Methacrilate) and SA (Stearic Acid) by variation powder loading concentration. The rheology properties are investigated using Shimadzu Flowtester CFT-500D capillary rheometer. The geometry of water atomised stainless steel powder are not in spherical shape. Therefore, it is expected significant changes in the rheological results that can influence the microcomponent, surface quality, shape retention and resolution capabilities. The optimization of the μMIM rheological properties as a function of stainless steel powder loading concentration are evaluated by flow behavior exponent, activation energy and moldability index. Results show that 61.5%vol contributes a significant stability over a range of temperature and the best powder loading from a rheological point of view. Therefore, distortion, defects and shrinkage could be minimised by using a best powder loading from rheological properties.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:micro metal injection molding, water atomised metal powder, rheological characteristics, powder loading.
Subjects:T Technology > TS Manufactures
Divisions:Mechanical Engineering
ID Code:7150
Deposited By: Khairur Rijal Jamaludin
Deposited On:30 Dec 2008 13:46
Last Modified:01 Jun 2010 15:49

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