The causes of defects during MIM solvent debinding process and methods of improvement.
Date Issued
2006
Date
2006
Author(s)
Su, Shao-Chin
DOI
zh-TW
Abstract
Powder injection molding (PIM) has become a popular process in producing complex-shaped parts. However, defects are still frequently found , particular during solvent debinding. These defects will decrease the mechanical properties of the products. In order to improve that, the effect of solvent debinding temperature, specimen thickness, and different solvents were examined.
The laser dilatometer analyses indicate that large amount of length changes usually occur when the solvent debinding temperature is higher than the melting point of the paraffin wax and fish scales are found on the surfaces. The fish scale is caused by the poor bonding between powder surfaces and binders, especially for 316L stainless steels. The length change also increases as specimen thickness increases. Thus, defects are found easily in complex-shaped parts. Moreover, it was found that adding IPA to heptane can decrease the specimen length changes. The specimens with baking process will also have higher yield after solvent debiding.
Subjects
粉末射出成形
尺寸變化
膨脹儀
溶劑脫脂
脫脂
缺陷
powder injection molding
in-situ dimensional change
laser dilatometer
solvent
solvent debinding
defects
cracks
Type
thesis
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