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원심분무법 제조 분말로 제작된 Fe - 79Ni - 4Mo 소결코아의 자기특성
김상원(SangWon Kim),양충진(ChoongJin Yang) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.6
Magnetic properties of sintered Fe-79Ni-4Mo cores made of centrifugal atomized powders were investigated. Hc and μ_α of the cores sintered at 1350 ℃ for 2 hours measured at 60 ㎐ at a magnetic field of 10 Oe showed the best properties. Particularly the properties of Hc and μα measured at low field (< 0.2 Oe) were found to increase with increasing the particle size of the core samples. It resulted from the domain wall motion depending on the grain size of sintered bodies. The best D. C magnetic properties of Hc and μmax were 0.085 Oe and 40000, respectively. A. C properties of the same cores showed the μα of 11000. The magnetic properties of sintered cores always exhibited an enhanced AC/DC performance by using the powders mixed with two different particle sizes. Those properties of cores are expected to apply for current transformer.
강자성 박판소재의 잔류응력 측정 시스템의 설계 및 제작
김상원(SangWon Kim),양충진(ChoongJin Yang) 한국자기학회 2001 韓國磁氣學會誌 Vol.11 No.2
Magnetic inductive probe was designed and assembled for sensing the residual stress developed in the ferromagnetic thin sheet. The residual stress measurement system with this probe could resolve the residual stresses developed in the sheet in terms of principal stress orientation, and magnitude of the principal stress. It was confirmed that the obtained probe output voltage from the qualified ferromagnetic Fe-42Ni lead frame sheet and quality-rejected sheet is effectively determined using the developed device. The lead frame sheet which has accumulated a high level of residual stress always showed a distinctive stress distribution and magnitude compared with those of qualified lead frame sheet. Those differences were well resolved as functions of input current or used frequency.