Fine powder ferrite for multilayer chip inductors

Author

Sung, Hsiao-Miin ; Chen, Chi-Jen ; Ko, Wen-Song ; Lin, Hong-Ching

Author_Institution

Mater. Res. Labs., Ind. Technol. Res. Inst., Hsinchu, Taiwan

Volume

30

Issue

6

fYear

1994

fDate

11/1/1994 12:00:00 AM

Firstpage

4906

Lastpage

4908

Abstract

Ni-Cu-Zn ferrite co-fired with Ag internal conductor below 900°C is very important for achieving a good quality and cost effective multilayer chip inductor. In this work, optimized processes were obtained to reduce the sintering temperature without deterioration of magnetic properties of ferrite. The main composition we used for low permeability ferrite was Fe₂O₃(48-50 mol%), NiO(40~50 mol%) with the rest of CuO and ZnO. The results manifested that the ferrite powder can be pulverized to fine particle size with 0.2~0.5 micron. Preliminary compensation of Fe₂O₃ make the ferrite easier to densify at 900°C, sintered density of 5.15 g/cm³ can be reached, and has good electromagnetic characteristics and higher Q factor

Keywords

Q-factor; copper compounds; densification; ferrites; inductors; magnetic particles; magnetic permeability; nickel compounds; powder technology; sintering; zinc compounds; 0.2 to 0.5 mum; 900 C; Ag; Ag internal conductor; Ni-Cu-Zn ferrite; NiCuZnFe₂O₄; Q factor; ball milling; densification; electromagnetic characteristics; fine particle size; fine powder ferrite; low permeability ferrite; magnetic properties; multilayer chip inductors; optimized processes; permeability; powder pulverization; sintered density; sintering temperature; Conductors; Costs; Ferrites; Inductors; Iron; Magnetic multilayers; Magnetic properties; Nonhomogeneous media; Powders; Temperature;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.334261

Filename

334261