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펄스자장을 이용한 고이방화 Nd - Fe - B 자석의 종축자장성형방법
김동환(Donghwan Kim),강병길(Byungkill Kang),장동열(Dongyoul Jang),김승호(Andrew S. Kim),김상면(Sangmyun Kim),장태석(T. S. Jang) 한국자기학회 2003 韓國磁氣學會誌 Vol.13 No.4
A new axial pressing method using pulse magnetizing field was studied to improve the remanence of Nd-Fe-B sintered magnets. In order to make near-net shape green compacts of butterfly, disk, or coin magnets, conventional axial-type pressing has been normally used. However, compared to the transverse-type pressing, it is not possible to obtain higher remanence by this method because the magnetic alignment of powder begins to deteriorate when the density of green compacts increases over a critical value. On the other hand, we found that an axial pressing under pulse magnetizing field was very effective to increase the degree of magnetic alignment of powder, yielding remanences even higher than those obtained by the transverse pressing. In this study, it was revealed that appropriate tapping density and how to apply pulse magnetic field were important to improve the grain alignment and thus remanence of Nd-Fe-B sintered magnet.