Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Sintering Behavior of M-type Sr-Hexaferrite by MnCO3 Addition

M-type Sr-Hexaferrite에서 MnCO3 첨가에 따른 소결 거동

  • Jeong, MinSeok (Energy Materials Center, Energy & Environment Division, Korea Institute of Ceramic Engineering & Technology) ;
  • You, Changjae (School of Materials Science and Engineering, Gyeongsang National University) ;
  • Cho, Jung Young (Energy Materials Center, Energy & Environment Division, Korea Institute of Ceramic Engineering & Technology) ;
  • Moon, Kyoung-Seok (School of Materials Science and Engineering, Gyeongsang National University)
  • 정민석 (한국세라믹기술원 에너지환경본부 에너지효율소재센터) ;
  • 유창재 (경상대학교 나노.신소재공학부) ;
  • 조중영 (한국세라믹기술원 에너지환경본부 에너지효율소재센터) ;
  • 문경석 (경상대학교 나노.신소재공학부)
  • Received : 2020.04.03
  • Accepted : 2020.04.14
  • Published : 2020.04.28
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Abstract

The grain growth behavior of M-type Sr hexaferrite (SrM) grains is investigated with the addition of MnCO3. First, the SrM powder is synthesized by a conventional solid-state reaction. The powder compacts of SrM are sintered at 1250℃ for 2 h with various amounts of MnCO3 (0, 0.5, 1.0, and 4.0 mol%). There is no secondary solid phase in any of the sintered samples. Relative density increases when MnCO3 is added to the SrM. Obvious abnormal grain growth does not appear in any of the SrM samples with MnCO3. The average grain size increases when 0.5 mol% MnCO3 is added to the SrM. However, as the amount of MnCO3 increase to over 0.5 mol%, the average grain size decreases. These observations allow us to conclude that the growth of SrM grains is governed by the two-dimensional nucleation grain growth mechanism, and the critical driving force for the growth of a grain decreases as the amount of MnCO3 increases.

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