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주조 및 열간압축된 Pr, Nd - Fe-B계 영구자석의 열자기 분석과 자기적 특성
김동엽(D. Y. Kim),이동구(D. G. Lee),정원용(W. Y. Jeung) 한국자기학회 1992 韓國磁氣學會誌 Vol.2 No.1
Minor phases in cast and hot-pressed R(R=Pr, Nd)-Fe-B magnet were investigated through thermomagnetic analysis. The relationship between minor phases and coercivities of R-Fe-B magnets was studied. α-Fe and Nd₂Fe_(17) were precipitated in as-cast Pr-Fe-B and Nd-Fe-B alloys respectively. These phases were considered to deteriorate the magnetic properties of R-Fe-B magnets. During the heat treatment, α-Fe and Nd₂Fe_(17) were annihilated and the magnetic properties of cast R-Fe-B magnet were improved. Hot-pressed Nd-Fe-B magnet showed better thermal stability than sintered magnet.