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Effect of Dispersant and Silane on Dispersion of Magnetic Powder Paste

연자성 금속 분말의 분산에 분산제와 실란이 미치는 영향

  • Lee, Chang Hyun (Electronic Convergence Materials Division, Korea Institute of Ceramic Engineering and Technology) ;
  • Shin, Hyo Soon (Electronic Convergence Materials Division, Korea Institute of Ceramic Engineering and Technology) ;
  • Yeo, Dong Hun (Electronic Convergence Materials Division, Korea Institute of Ceramic Engineering and Technology) ;
  • Nahm, Sahn (Department of Materials Science and Engineering, Korea University)
  • 이창현 (한국세라믹기술원 나노융합소재센터) ;
  • 신효순 (한국세라믹기술원 나노융합소재센터) ;
  • 여동훈 (한국세라믹기술원 나노융합소재센터) ;
  • 남산 (고려대학교 신소재공학과)
  • Received : 2018.08.07
  • Accepted : 2018.09.28
  • Published : 2019.01.01

Abstract

Various process technologies for manufacturing power inductors are under development. The core goal is to increase the mixing ratio of the soft magnetic powder in the epoxy, and to uniformly disperse it in a molding-type power inductor, manufactured by the injection molding method. In this study, we investigated the effect of dispersant and silane on the dispersion of soft magnetic metal powders in epoxy. We added 0.6 wt% of dispersant and 2.0 wt% of silane, and an excellent dispersibility resulted. Under the conditions of 0.3 wt% of dispersant and 0.5 wt% of silane, we added both dispersant and silane together to observe the effect of their interaction on dispersibility. Similarly, the addition of 0.3 wt% of dispersant and 0.1 wt% of silane resulted in a sharp increase in viscosity, considered to be due to the interaction of the dispersant and silane. The addition of 0.1 wt% of dispersant with 0.5 wt% of silane resulted in a sharp rise in viscosity, and sedimentation-height decreased sharply due to the dispersion optimization.

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Fig. 1. Experimental flow chart.

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Fig. 2. Viscosity and sedimentation height with addition of dispersant;(a) viscosity and (b) sedimentation height.

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Fig. 3. Viscosity and sedimentation height with addition of silane;(a) viscosity and (b) sedimentation height.

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Fig. 4. Viscosity and sedimentation height with addition of silane after addition of 0.3 wt% dispersant; (a) viscosity and (b) sedimentation height.

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Fig. 6. Microstructure according to addition amount of dispersant and silane; (a) dispersant 0.3 wt%, (b) silane 0.5 wt%, (c) dispersant 0.3 wt%, silane 0.1 wt%, and (d) silane 0.5 wt%, dispersant 0.1 wt%.

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Fig. 5. Viscosity and sedimentation height with addition of dispersant after addition of 0.8 wt% silane; (a) viscosity and (b) sedimentation height.

Table 1. Mixing ratios of contents.

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Acknowledgement

Supported by : 중소기업청

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