Effects of borosilicate glass additions on microstructures and magnetic properties of low temperature co-fired NiCuZn ferrites

摘要

The low temperature co-fired NiCuZn ferrites with different borosilicate glass additions are prepared by a conventional solid-state reaction method. It is found that borosilicate glass additions can enhance densification of specimens based on liquid phase sintering and grain growth promotion. Small amount of borosilicate glass additions do not have a significant effect on forming into the main phase. But too much glass additions will damage the magnetic properties. As the borosilicate glass additions increase from 0 to 0.1 wt%, the permeability measured at 100 kHz decreases from 664 to 555, while the permeability values decrease rapidly from 310 to 169 with the glass additions rising from 0.3 to 0.9 wt%. The 0.1 wt% borosilicate glass can enhance the resistivity from 4.07 × 10~(10) ft cm to 9.81 × 10~(10) ft cm, while 0.9 wt% borosilicate glass addition leads to inhomogeneous grains and intragranular pores, resulting in deterioration of the resistivity to only 1.4 × 10~(10) ft cm.