화학공학소재연구정보센터
Korean Journal of Materials Research, Vol.13, No.8, 503-508, August, 2003
V2O5 도핑된 NiCuZn 페라이트로 제조된 칩인덕터에서의 Ag/cu 석출
Ag and Cu Precipitation in Multi-Layer Chip Inductors Prepared with V 2 O 5 Doped NiCuZn Ferrites
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The purpose of this study is to investigate the effect of V 2 O 5 addition on the Ag and Cu precipitation in the NiCuZn ferrite layers of 7.7 × 4.5 × 1.0 mm sized multi-layer chip inductors prepared by the screen printing method using 0∼0.5 wt% V 2 O 5 -doped ferrite pastes. With increasing the V 2 O 5 content and sintering temperature, Ag and Cu oxide coprecipitated more and more at the polished surface of ferrite layers during re-annealing at 840 ? C . It was thought that during the sintering process, V dissolved in the NiCuZn ferrite lattice and the Ag-Cu liquid phase of low melting point was formed in the ferrite layers due to the Cu segregation from the ferrite lattice and Ag diffusion from the internal electrode. During re-annealing at 840 ? C , the Ag-Cu liquid phase came out the polished surface of ferrite layers, and was decomposed into the isolated Ag particles and the Cu oxide phase during the cooling process.
  1. Nam JH, Jeong HH, Shin JY, Oh JH, J. Kor. Magn. Soc., 5(3), 191 (1995)
  2. Stuijts AL, Verweel J, Peloschek HP, Trans. IEEE Commun. Electron, 75, 726 (1964)
  3. Fujimoto M, Hoshi K, Nakazawa M, Sekiguchi S, Jpn. J. Appl. Phys., 32(12A), 5532 (1993)
  4. Nakano A, Moroi H, Nomura T, J. Jpn Soc. Powder and Powder Metallurgy, 39(8), 612 (1992)
  5. Fujimoto M, J. Am. Ceram. Soc., 77(11), 2873 (1994)
  6. Nakamura T, Okano Y, Miura S, J. Mater. Sci., 33(4), 1091 (1998)
  7. Hsu JY, Ko WS, Shen HD, Chen CJ, IEEE Trans. Magn., 30(6), 4875 (1994)
  8. Jean JH, Lee CH, J. Appl. Phys., 38(5A), 3508 (1999)
  9. Jean JH, Lee CH, J. Am. Ceram. Soc., 82(2), 343 (1999)
  10. Hsu JY, Ko WS, Chen CJ, IEEE Trans. Magn., 31(6), 3994 (1995)
  11. Jean JH, Lee CH, J. Appl. Phys., 40(4A), 2232 (2001)
  12. Je HJ, J. Kor. Magn. Soc., 13(3), 109 (2003)