Here are five common NFC ferrite tablets on the market
Follow the footsteps of xiaobian, today summarized the next market common in 5 NFC ferrite tablets, I hope to give to the friends in need.
First of all, let's understand the introduction of NFC ferrite piece: 13.56MHZ antenna ferrite piece/film is a high-temperature sintered ferrite material. In handheld devices such as payment phones, such as NFC(Near Field Communication), the main function of electronic tags is to reduce the absorption of signal magnetic Field by metal materials. Meanwhile, ferrite film itself is a high-temperature sintered ferrite material, which can effectively increase the induction distance by increasing the magnetic Field strength.
NFC ferrite tablets
Five common NFC ferrite tablets on the market:
1. Soft ferrite
The variety of soft ferrite is the most widely used. According to different USES, there are various types of ferrites with identical composition and performance. For example, in the ultra-high frequency range, magnetic lead hexagonal ferrite can be selected; in the audio frequency, medium frequency, high frequency range, commonly used spinel Mn -Zn ferrite, Ni-Zn ferrite, Li-Zn ferrite, etc.
Soft ferrite molding, general color; Dry pressing, extrusion, grouting or hot die casting as well as isostatic pressing, hot pressing and explosion methods. In order to reduce the shrinkage of the products, make the reaction sufficient, and improve the internal performance of ferrite, generally to pre-burn first, some low temperature pre-burn, some high temperature pre-burn, some even require two pre-burn.
2. Hard ferrite
Hard ferrite can be called permanent magnet material, mainly including Ba - ferrite of magnetic lead stone type, Sr - ferrite, Pb - ferrite, and CO - ferrite of spinel type. The sintering density of ferrite is related to the residual magnetic induction intensity, and the denser the ferrite, the greater the residual magnetic induction intensity. Although increasing the sintering temperature can increase the density of the magnet, it will lead to the growth of magnetic phase grains, which is unfavorable to the magnetic induction strength.
3. Spin ferrite
Magnetorotary ferrite is mainly used to make various microwave components, so it is also known as microwave ferrite. At present, the main widely used spinel and pomegranate ferrite. Magneto - lead - type spin ferrite can be used in very high frequency bands. It is made by replacing part of Fe in Ba, Sr and PB ferrite with Al.
4. Moment ferrite
Generally speaking, the spinel ferrite with high density, uniform grain and large crystalline anisotropy can be made into the moment magnetic ferrite, so that the ferrite has a good rectangular hysteresis loop, but the excess and magnetization require a large current, which is not good for the core.
5. Magnetic ferrite
The density of the ferrite is directly related to the magnetic properties of the ferrite. In the production process, the density of ferrite can be improved by increasing the forming pressure, increasing the firing temperature, introducing additives and high temperature prefiring.
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