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Thermal decomposition behavior of nano/micro bimodal feedstock with different solids loading

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Abstract

Debinding is one of the most critical processes for powder injection molding. The parts in debinding process are vulnerable 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 be understood. Since nano powder affects the decomposition behavior of feedstock, nano powder effect needs to be investigated for nano/micro bimodal feedstock. In this research, nano powder effect on decomposition behavior of nano/micro bimodal feedstock has been studied. Bimodal powders were fabricated with different ratios of nano powder, and the critical solids loading of each powder was measured by torque rheometer. Three different feedstocks were 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 decomposition activation energy was calculated. The result indicated nano powder showed limited effect on feedstocks in lower solids loading condition than optimal range. Whereas, it highly influenced the decomposition behavior in optimal solids loading condition by causing polymer chain scission with high viscosity.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea

    Joo Won Oh & Seong Jin Park

  2. The Advanced Process and Materials R&D Group, Korea Institute of Industrial Technology, Incheon, 21999, Republic of Korea

    Won Sik Lee

Authors
  1. Joo Won Oh
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  2. Won Sik Lee
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  3. Seong Jin Park
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Correspondence to Seong Jin Park.

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Oh, J.W., Lee, W.S. & Park, S.J. Thermal decomposition behavior of nano/micro bimodal feedstock with different solids loading. Met. Mater. Int. 24, 142–148 (2018). https://doi.org/10.1007/s12540-017-7301-9

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  • DOI: https://doi.org/10.1007/s12540-017-7301-9

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