| Summary: | 碩士 === 國立臺北科技大學 === 材料及資源工程系研究所 === 100 === The desired functionality of ferrite components are often designed by the special geometry of the structure, size and location. The current study is to prepare Ni-Zn-Cu ferrite via injection molding process. Process parameters including solid loading fraction, binder system, content of binders, mixing procedures and debinding processes are considered. In order to obtain the optimum of Ni-Zn-Cu ferrites, the binder ratio was at 0.83-3.70, the solid contene was controlled at 40 -60 vol.% . The relationship of basad feedstock formulation and injection molding was disscused.
According to experimental results, pre-coated surface of stearic acid can mitigate the powder agglomeration and improve mixing uniformly. Add 6 vol.% of stearic acid
are able to reduce shoot parts of the pore size and incredse density. The highest relative density of 98.79% could be at the ratio of polypropylene and paraffin wax at 1.23. Increased PP content effect porous resulting and in reduced density. Solid content improve the density and reduce shrinkage and reduce rheological behavior, consequently must enhance injection pressure must be increased；injection speed and temperature, to avoid short shots or green pieces have cracked and peeling. The experimental results show that 53 vol.% are the highest limit of the solid content and 50 vol.% are the best formulations.
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