I. introduction of magnetic core materials

1: definition and composition of magnetic core

The magnetic core, which plays an important role in the electronics industry, is a sintered magnetic metal oxide composed of a mixture of iron oxide. With its existence, the coils and transformers of electronic equipment can work more efficiently and stably. Typical core materials include nickel-zinc ferrite and manganese-zinc ferrite, which have their own characteristics and provide a variety of options for the development of electronic equipment.

2: characteristics of magnetic core materials

The characteristic of magnetic core material determines its application effect in electronic equipment. Taking mn-Zn ferrite as an example, it has the characteristics of high permeability, high flux density and low loss, which make it perform well at high frequency. On the other hand, Ni-Zn ferrite has the characteristics of high impedance and low permeability, which makes it have better performance in some specific situations.

3: application of magnetic core

Magnetic core is widely used in electronic equipment, mainly used in coils and transformers of all kinds of electronic equipment. Its function is to improve the efficiency of coils and transformers, reduce energy loss, and ensure the stable operation of electronic equipment. It can be said that the magnetic core is an indispensable part of electronic equipment.

2. Types and characteristics of magnetic core materials

1: iron powder core

Iron powder core, this kind of magnetic core material is mainly composed of iron oxide, the price is relatively low, which makes it have an advantage in some occasions where the cost is required. The saturation magnetic induction intensity is about 1.4T and the permeability range is 22-100ui. It has good stability and DC current superposition performance, but high frequency consumption. These characteristics make the iron powder core suitable for some specific applications.

2:Mn-Zn class

The composition of Mn-Zn core materials includes 70%Fe2O3, 17%MnO and 13%ZnO. This material has strong electrical conductivity and generally needs to be coated and insulated, and the coating is generally green. It is easy to magnetic saturation, the sensing range is generally more than 30%, and is obviously affected by external temperature and pressure. When making samples, we usually set the sense XXuH MIN, if the customer has the induction range requirements, we must use self-drying glue to fix the BASE or partition, and remember not to bake.

3:Ni-Zn ferrite

The main component of Ni-Zn ferrite is ferric oxide, which is composed of a small amount of trace elements such as zinc oxide, nickel oxide, copper oxide, cobalt oxide and so on. It is usually not painted and needs to measure the impedance, that is, the Z value. Sometimes you need to feel. Our factory does not use many Ni-Zn magnetic rings, usually RH,R6H,RID and other BEAD excellent magnetic is the main supplier type. Generally painted green, follow the same color of MN-ZN material, we should pay attention to the distinction. Its high surface impedance is an electrical insulator EMI antimagnetic interference (low frequency low impedance, high frequency high impedance) Ni-Zn materials generally have low saturation magnetic beam density (BS) and high coercivity (HC), and can not withstand large current and multi-hysteresis loss.

4:MPP CORES Fe-Ni-Mo metal magnetic powder core

MPP CORES iron-nickel-molybdenum metal magnetic powder core is composed of 81%Ni, 2%Mo and Fe. The main characteristics are that the saturation magnetic induction intensity is about 7500Gs, the magnetic permeability range is wide, from 14 to 550, the powder core loss is the lowest, and the temperature stability is excellent, so it is widely used in space equipment, open-air equipment and so on. The magnetostrictive coefficient is close to zero and there is no noise when working at different frequencies.

III. Comparison table of core materials

The existence of the magnetic core material comparison table enables us to more intuitively understand the properties of various magnetic core materials, so as to make a more appropriate choice. Mn-Zn oxides have the characteristics of high permeability, high flux density and low loss, so they are suitable for some situations with high requirements for permeability and flux density. The nickel-zinc oxide has the characteristics of high impedance and low permeability, so it is suitable for some occasions with high impedance.

Generally speaking, the choice of core materials needs to be determined according to specific applications and requirements. Different magnetic core materials have different characteristics. Only by selecting the appropriate magnetic core materials can the electronic equipment exert the best performance.