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Alnico 8 型 硬質磁性材料의 磁氣的 性質에 미치는 添加元素의 影響
徐圓根,金澤基,金潤培 忠南大學校 産業技術硏究所 1986 산업기술연구논문집 Vol.1 No.1
In order to study the alloying elements effects on the magnetic properties in Alnico 8 (Fe-35Co-14Ni-7Al-5Ti-3Cu) permanent magnet alloy, some Alnico 8-type alloys which are different in composition of Ni, Cu, Ti and Al were prepared by induction melting. They were thermomagnetically treated at 740℃ - 840℃ for 3-15 min and then aged at 600℃ for 15hours. The magnetic properties and the optimum thermomagnetic treatment condition were investigated. The results were as follows ; 1) The region of the high temperature α phase, the zone of the solution treatment, is extended by Al and Ti, but that is reduced by Ni and Cu. 2) In the composition range of 10-14 wt.% of Ni, the coercive force decreases greatly with decreasing the Ni content with little change of the residual magnetization and the squareness of demagnetization curve. The optimum thermomagnetic treatment condition appeared at high temperature and short time with decreasing the Ni content. 3) In the composition range of 1-3wt.% of Cu, the coercive force decreases greatly with decreasing the Cu content, but the residual magnetization shows increasing tendency with decreasing the Cu content. The optimum thermomagnetic treatment condition appeared at low temperature and long time with decreasing the Cu content. 4) In the composition range of 5-8wt.% of Ti, the coercive force increases with increasing the Ti content, but the residual magnetization decreases with increasing Ti content. The optimum thermomagnetic treatment temperature was not dependent on the Ti content, but the optimum thermomagnetic treatment time appeared at long time with increasing the Ti content.