Abstract
With the miniaturization of electronic devices, ferrites with high mechanical strength are demanded. In this paper, the effect of SiO2 on the bending strength of NiCuZn ferrite was investigated. It has been found that the bending strength of NiCuZn ferrite was increased the addition of SiO2. The NiCuZn ferrite with SiO2 addition showed a structure with smaller and more uniform grain size than non-addition. As a result of analysis, Si exists in the same position as Zn, suggesting the formation of Zn2SiO4. The thermal expansion coefficient of Zn2SiO4 is lower than that of ferrite. The improvement in the bending strength of NiCuZn ferrite are attributed to the control of grain growth by Zn2SiO4 and the residual stress caused by the difference of coefficients of liner thermal expansion between ferrite phase and Zn2SiO4 phase.
