Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Characteristics of Powder with Change of Temperature in Production of Tantalum Powder by MR-EMR Combination Process

MR-EMR 복합공정에 의한 탄탈륨분말의 제조시 온도변화에 따른 분말의 특성

  • 배인성 (희유금속소재연구소) ;
  • 윤재식 (희유금속소재연구소) ;
  • 박형호 (희유금속소재연구소) ;
  • 윤동주 (한려대학교 신소재공학과) ;
  • 이민호 (전북대학교 치과대학 치과재료학교실 및 구강생체과학연구소) ;
  • 설경원 (전북대학교 신소재공학부) ;
  • 김병일 (순천대학교 재료금속공학과)
  • Published : 2003.12.01
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Abstract

In the conventional metallothermic reduction (MR) process for obtaining tantalum powder in batch-type operation. it is difficult to control morphology and location of deposits. On the other hand, a electronically mediated reaction (EMR) process is capable to overcome these difficulties and has a merit of continuous process, but it has the defect that the reduction yield is poor. MR-EMR combination process is a method that is able to overcome demerits of MR and EMR process. In this study, a MR-EMR combination process has been applied to the production of tantalum powder by sodium reduction of $K_2$TaF$_{7}$. The total charge passed through external circuit and average particle size (FSSS) were increased with increasing reduction temperature. The proportion of fine particle (-325 mesh) was decreased with increasing reduction temperature. The yield was improved from 65% to 74% with increasing reduction temperature. Considering the charge, impurities, morphology, particle size and yield, an reduction temperature of 1,123 K was found to be optimum temperature for MR-EMR combination process.

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References

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