Effect of SiO₂ Content on the Electromagnetic Properties of CoZn-Z Type Barium Ferrite Prepared with Ferrous Micro-Beads

Abstract:

Ferrous micro-beads from fly-ash were used as starting material to prepare CoZn-Z type barium ferrite. As the main impurity in the beads, SiO₂ plays an important role on the electromagnetic properties of the ferrites. To investigate the effect of SiO₂ content, a series of CoZn-Z type ferrites with various contents of SiO₂ (1 wt%, 2 wt% and 5 wt%) were prepared with analytical pure Fe₂O₃ and SiO₂. The density, phase composition, microstructure and electromagnetic properties of the sintered samples were investigated. The results show that the permeability of samples alters little at a low content of SiO₂ about 1 wt%, but deteriorates dramatically when the addition of SiO₂ is above 2 wt%. The ferrous micro-beads were then treated by alkali cleaning to reduce the content of SiO₂ to about 1 wt%, and the samples prepared with these treated beads show a similar performance on the electromagnetic properties with pure CoZn-Z type ferrite.

• Periodical: Key Engineering Materials (Volumes 512-515)
• Pages: 1424-1428
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.512-515.1424
• Online since: June 2012
• Authors: Yue Miao Sun, Wang Qun, Zhi Xue Qu, Mei Wu Shi
• Keywords: CoZn-Z Type Barium Ferrite, Ferrous Micro-Beads, Permeability, Silica

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