| ZnO와 PbO가 Sr-페라이트의 자기적 특성에 미치는 영향 |
| 김정훈, 김동엽, 김동진1, 정완배2, 오재현 |
연세대학교 금속공학과
1한국동력자원연구소 제련연구 1실
2한국과학기술연구원 금속재료연구단 |
| Effects of ZnO and PbO on the Magnetic Properties of Sr-ferrite |
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| ABSTRACT |
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Effects of ZnO, PbO and SiO2 on the grain growth and magnetic properties of Sr-ferrite were investigated. (1) Addition of ZnO to Sr-ferrite increased remanence, but decreased coercivity and maximum energy product. (2) Addition of PbO up to 0.5 wt% increased (B$.$H)max of Sr-ferrite, but addition more than 0.5 wt% decreased (B$.$H)mzx (3) SiO2 addition to the 0.5 wt% PbO doped Sr-ferrite decreased remanence and increased coercivity. The coercivity increase in due to the grain refinement effect of SiO2. But addition of SiO2 more than 0.5 wt% invoked a decrease of coercivity and (B$.$H)max of Sr-ferrite due to abnormal grain growth. Sr-ferrite magnet having maximum energy product of 3.7MGOe was fabricated by using the roasting product of Pyrrhotite. |
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