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Effect of Annealing Temperature on Magnetic Properties of Dust Cores
Mitani Hiroyuki,Akagi Nobuaki,Houjou Hirofumi,Kanamaru Moriyoshi 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Magnetic Properties of dust cores made of mixtures of atomized pure iron powder and pure alumina powder has been investigated in the temperature range from 673 to 1073K. The effect of annealing on coercivity has been positive effect up to 973K and thus coercivity is gradually reduced form 280A/m (as-compressed) to 160A/m (973K). However, dust cores annealed at 1073K displayed a 15% increasing of coercivity by annealing at 973K. Hysteresis loss shows a tendency similar to coercivity. Microstructure observation of specimens shows grain refinement by recrystallization in the temperature range from 773 to 1073K.