材料及製程參數對射出成形元件品質影響之研究

　　Metal powder compacts and metal injection molded(MIM) parts are usually fragile before sintering. This low strength caused damages during handling. For this reason, the objective of this study was to examine the effects of binder selection and molding parameters on the green strength of MIM parts.
　　Polypropylene and polyethylene were generally used as the backbone binder in MIM. Thus, various PP and PE were examined for their advantages and disadvantages. The results show that PE is better than PP. High Temperature Paraffin Wax(HTPW) was examined, but no advantages. Addition of the Mg-St and Li-St can improve quality of molding, but no important in strengthen.
　　During the solvent debinding, swelling was observed when the spec-
imens were immersed in the solvent. The major causes were the thermal expansion due to the temperature rise of the specimens and the swelling reaction between the binder and solvent. The amount of expansion was also related to the temperature, amount of the binder, and the type of the binder selected.