Mixing and rheological characterization of water atomised stainless steel powder for metal injection moulding using waste polystyrene as binder system

Mohd Nawi, Fifi Khazanie (2013) Mixing and rheological characterization of water atomised stainless steel powder for metal injection moulding using waste polystyrene as binder system. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

The issues to be highlighted here is to fundamentally evaluate the potential of using waste polystyrene as a backbone binder in Metal Injection Moulding (MIM.) This is by the fact that the earth has tons of polystyrene disposed every day and researcher believes such waste can be converted into more beneficial industrial product. Thus this research investigates the potential uses of polystyrene as a novel binder system in metal injection moulding. Stainless steel SS3 16L was used which is polystyrene and palm kernel acts as binder system. Feedstock with different composition 0.60% and 0.55% (60/40, 30170, 20180) powder loading (PL) were tested to know the feedstock characteristics. The homogeneity of the feedstock was investigated by using binder bum out test with Termogravimetic analysis (TGA). From the test it was found that PL 0.60% 70130 is the best homogeneity. The rheology test was being held for better proven. The rheology properties are investigated using Shimadzu Flowtester CFT-5OOD capillary rheometer. The optimization of the pMIM rheological properties as a function of stainless steel powder loading concentration are evaluated by flow behavior exponent, activation energy and mouldability index. The result show all the feedstock is a pseudo-plastic while no dilatant behaviour, it is no powder binder separation. Polystyrene are suitable acted as a binder system in metal injection moulding. Furthermore, it could reduce the cost of binder system. The feedstock achieved desirable injection moulding characteristics, such as homogeneous, stable, flow behaviour exponent, n < 1, moderate activation energy (E) and high mouldability index (a). The suitable volume ratios in mixing process produce a better feedstock in order to produce the green part by injection moulding.

Item Type:Thesis (Masters)
Subjects:T Technology > TN Mining engineering. Metallurgy
ID Code:5852
Deposited By:Normajihan Abd. Rahman
Deposited On:11 Dec 2014 14:59
Last Modified:11 Dec 2014 14:59

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