Journal of the Korean Magnetics Society (한국자기학회지)

The Korean Magnetics Society (한국자기학회)
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Study on Low-Temperature sintering of Co2Z type Ba ferrites for chip inductor

Chip inductor용 Co2Z type Ba-ferrite의 저온소결에 관한 연구

  • Published : 2002.10.01
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Abstract

Low temperature sintering of Co$_2$Z type Ba ferrites with various oxide additives has been studied. Co$_2$Z phase was obtained by 2 step calcination and XRD peaks showed a good agreement with the peaks of the standard Co$_2$Z phase, except for some minor extra peaks. ZnO-B$_2$O$_3$ glass, ZnO-B$_2$O$_3$ and CuO, ZnO-B$_2$O$_3$ and Bi$_2$O$_3$, and ZnO-Bi$_2$O$_3$ glass were added to lower sintering temperatures. Specimens were sintered at the temperature range between 900 $^{\circ}C$ and 1000 $^{\circ}C$. In the single addition of ZnO-B$_2$O$_3$ glass, the specimen with 7.5 wt％ showed the highest shrinkage. Specimens with complex addition of ZnO-B$_2$O$_3$ glass with CuO or Bi$_2$O$_3$ showed higher shrinkages and initial permeabilities than single addition of ZnO-B$_2$O$_3$ glass. Shrinkages and initial permeabilities of the specimens with ZnO-Bi$_2$O$_3$ glass were higher than those of ZnO-B$_2$O$_3$ glass addition.

각종 산화물을 첨가하여 Co$_2$Z type Ba-ferrite의 저온소결에 관하여 연구하였다. Co$_2$Z type Ba-ferrite 상은 2회 하소과정을 통하여 얻을 수 있었으며, 생성된 상의 XRD peaks는 일부 minor peaks 제외하고는 standard peaks와 거의 일치하였다 제조된 분말은 저온소결을 위하여 ZnO-B$_2$O$_3$ glass리 단독 첨가 및 CuO 또는 Bi$_2$O$_3$와 복합 첨가하였으며, 또한 ZnO-Bi$_2$O$_3$ glass를 단독 첨가하였다. 소결은 900~100$0^{\circ}C$에서 수행하였다. ZnO-B$_2$O$_3$ glass의 단독 첨가 시, 첨가량이 7.5 wt%일 때 가장 높은 수축거동을 나타내었다. ZnO-Bi$_2$O$_3$ glass와 CuO 또는 Bi$_2$O$_3$를 복합 첨가하였을 때, glass를 단독 첨가하였을 경우보다 수축률이 급격히 증가되었다. 또한 ZnO-Bi$_2$O$_3$ glass를 단독 첨가한 시편의 수축률과 초기 투자율은 ZnO-B$_2$O$_3$ glass를 단독 첨가한 시편보다 높은 값을 나타내었다.

Keywords

References

  1. T. Nakamura, Fenites, Proceedings of the 8th International Conference of Ferrites, Japan, pp. 967-969(2000)
  2. 윤상옥,이형진,윤기현,정형진,자성재료세라믹스,반도출판사(1996)
  3. M. Endo, A. Nakano. Ferdtes, Proceedings of the 8th Intema-tional Conference of Femtes, Japan, pp. 1168-1170(2000)
  4. H. Zhang, L. Li, P. Wu, J. Zhou, Z. Ma, Z. Gui, Material Research BulL, 35, pp. 2207-2215(2000) https://doi.org/10.1016/S0025-5408(00)00413-X
  5. H. Marusawa, C. Kato, Ferrites, Proceedings of the 8th Inter-national Conference of Ferrites, Japan, PP. 942-944(2000)
  6. 강석중,소결.과학문화사,(1997)
  7. J. Smit, H. P. J. Wijn, Ferrites, Philips technical library (1959)
  8. Ken Hirota, Tatsuji Aoyama, Sinsuke Enomoto, J. of Mag. and Mag. Matenals, 205, PP. 283-289(1999) https://doi.org/10.1016/S0304-8853(99)00480-1
  9. Sea-Fue Wang, Yuh-Ruey Wang, Thomas C. K. Yang, Po-Jeng Wang, Chun-An Lu, J. of Mag. and Mag Matehals, 217, PP. 35-43(2000) https://doi.org/10.1016/S0304-8853(00)00325-5
  10. Hsiao-Miin Sung, Chi-Jen Chen, Lih-Jiun Wang, Wen-Song Ko, IEEE Trans. on Mag., vol. 34, no. 4, PP. 1363-1365, (1998) https://doi.org/10.1109/20.706549
  11. T. Tachibana, K. Ohta, T. Shimada, Ferrites, Proceedings of the 8th International Conference of Ferrites, Japan, pp. 888-890, (2000)