한국분말재료학회지 (Journal of Powder Materials)

  • 제21권3호
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  • Pages.215-221
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  • 2014
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  • 2799-8525(pISSN)
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  • 2799-8681(eISSN)
한국분말재료학회 (*구 분말야금학회) (The Korean Powder Metallurgy & Materials Institute)
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분말사출성형 시 분말 혼합체의 유동성 시뮬레이션을 통한 투광성 알루미나 소결체의 특성 연구

A study on the Powder Injection Molding of Translucent Alumina via Flowability Simulation of Powder/Binder Mixture

  • 김형수 (한양대학교 신소재공학과) ;
  • 변종민 (한양대학교 신소재공학과) ;
  • 김세훈 (자동차부품연구원 소재융합디자인연구센터) ;
  • 김영도 (한양대학교 신소재공학과)
  • Kim, Hyung Soo (Department of Materials Science and Engineering, Hanyang University) ;
  • Byun, Jong Min (Department of Materials Science and Engineering, Hanyang University) ;
  • Kim, Se Hoon (Material Convergence & Design R&D Center, KATECH) ;
  • Kim, Young Do (Department of Materials Science and Engineering, Hanyang University)
  • 투고 : 2014.06.05
  • 심사 : 2014.06.19
  • 발행 : 2014.06.28
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초록

Translucent alumina is a potential candidate for high temperature application as a replacement of the glass or polymer. Recently, due to the increasing demand of high power light emitting diode (LED), there is a growing interest in the translucent alumina. Since the translucent property is very sensitive to the internal defect, such as voids inside or abnormal grain growth of sintered alumina, it is important to fabricate the defect-free product through the fabrication process. Powder injection molding (PIM) has been commonly applied for the fabrication of complex shaped products. Among the many parameters of PIM, the flowability of powder/binder mixture becomes more significant especially for the shape of the cavity with thin thickness. Two different positions of the gate were applied during PIM using the disc type of die. The binder was removed by solvent extraction method and the brown compact was sintered at $1750^{\circ}C$ for 3 hours in a vacuum. The flowability was also simulated using moldflow (MPI 6.0) with two different types of gate. The effect of the flowability of powder/binder mixture on the microstructure of the sintered specimen was studied with the analysis of the simulation result.

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