Problems of ferrite cores after high and low temperature thermal shock
Ferrite is a metal oxide with ferromagnetism. Sintered by iron oxide and other ingredients. According to different magnetic properties and application conditions, ferrite cores can be divided into five types: soft magnetic, permanent magnet, gyromagnetic, moment magnet, and piezomagnet.
Ferrite is a metal oxide with ferromagnetism. In terms of electrical properties, the resistivity of ferrite is much larger than that of metal and alloy magnetic materials, and it also has higher dielectric properties. The magnetic properties of ferrite also show high permeability at high frequencies. Therefore, ferrite has become a non-metallic magnetic material with a wide range of applications in the field of high frequency and weak current.
Ferrite cores can be wound with coils to make inductors or transformers. They are widely used in instrumentation, communication equipment and household appliances. The ferrite core cannot survive the high and low temperature thermal shock, the reasons are as follows:
1. The sintering temperature is too high, there are too many pores, or there are precipitated phases, and the strength is reduced;
2. The sintering temperature is too fast and the strength decreases;
3. The sintering atmosphere is not uniform, and the strength of some products is reduced;
4. Uneven powder mixing;
5. Too much organic matter is added
6. The powder has poor fluidity and uneven molding density;
7. Collision before or after sintering;
8. The internal stress is too large.