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자료유형
학술저널
저자정보
오주원 (포항공과대학교) 이원식 (한국생산기술연구원) 박성진 (포항공과대학교)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.24 No.1
발행연도
2018.1
수록면
142 - 148 (7page)

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Debinding is one of the most critical processes for powder injection molding. The parts in debinding process arevulnerable to defect formation, and long processing time of debinding decreases production rate of whole process. In order to determine the optimal condition for debinding process, decomposition behavior of feedstock should beunderstood. Since nano powder affects the decomposition behavior of feedstock, nano powder effect needs to beinvestigated for nano/micro bimodal feedstock. In this research, nano powder effect on decomposition behavior ofnano/micro bimodal feedstock has been studied. Bimodal powders were fabricated with different ratios of nanopowder, and the critical solids loading of each powder was measured by torque rheometer. Three different feedstockswere fabricated for each powder depending on solids loading condition. Thermogravimetric analysis(TGA) experiment was carried out to analyze the thermal decomposition behavior of the feedstocks, and decompositionactivation energy was calculated. The result indicated nano powder showed limited effect on feedstocks inlower solids loading condition than optimal range. Whereas, it highly influenced the decomposition behavior inoptimal solids loading condition by causing polymer chain scission with high viscosity.

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