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Rheological Characteristic of Water Atomised Stainless Steel Powder for Micro Metal Injection Molding

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) Rheological Characteristic of Water Atomised Stainless Steel Powder for Micro Metal Injection Molding. In: Second Advanced Manufacturing Researach Group Seminar , 17 & 18 December 2008, Port Dickson, Negeri Sembilan.

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Abstract

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 it 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 (Polyethylene 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. As 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:μMIM, water atomised metal powder, rheological characteristics, powder loading.
Subjects:T Technology > TS Manufactures
Divisions:Mechanical Engineering
ID Code:7148
Deposited By: Khairur Rijal Jamaludin
Deposited On:30 Dec 2008 13:46
Last Modified:01 Jun 2010 15:49

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