Mixing and rheological characterization of water atomised stainless steel powder for metal injection moulding using waste polystyrene as binder system
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...
Saved in:
| Main Author: | |
|---|---|
| Format: | Thesis |
| Published: |
2013
|
| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/5852/ http://eprints.uthm.edu.my/5852/4/FIFI_KHAZANIE_BT_MOHD_NAWI_X.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | 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. |
|---|