| Summary: | 碩士 === 國立臺灣大學 === 材料科學與工程學研究所 === 85 === Abstract
There were three objectives in this study. The first one was to
optimize the composition for a binder consisting of
polyethylene, wax, stearic acid. The second one was to evaluate
three stainless steel powders with different size and shape. The
third one was to examine the effect of major molding parameters
on the rheology and physical properties of molded compacts.
In the first experiment, four binder compositions (LDPE:PW:
SA=30:65:5,35:60:5,40:55:5,and 45:50:5)were evaluated. The
results on green strength,sagging during debinding, tolerance
control,and defect percentage showed that the binder ratio of
40:55:5 is the best.
In the second experiment, three stainless steel powders
designated as A, M, and P were examined for their spiral flow
length, green strength, shape retention capability, swelling
during solvent debinding, tolerance and density stability.
Results showed that water atomized powder P is the best
considering the overall performance. The optimum sintering
temperature were 1370℃ and 1320℃ for powder A and M,
respectively. For powder P,the adequate sintering temperature
ranged from 1320 to 1370℃. In the third
experiment, feedstock after one molding run showed the best
rheology property compared to the fresh and second recycled
feedstock. The length of holding pressure time and the rotation
speed were found to be insignificant to the green properties.
But, the density and weight of green specimens increased with
increasing holding pressure. The tolerance control was
influenced by the holding pressure and the powder shape.
Key words:316L S.S. powder ,solvent debinding,dimension
stability ,defects ,debinding slumping,powder shape , solvent
debinding dilation ,binder ,processing parameter.
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