Ferrites are divided into several types, and iron oxides are classified

Ferrite ferrite can be divided into two types: manganese-zinc and nickel-zinc; The coil disc is made of manganese-zinc system, also known as soft magnetic.

Magnetite: It is a spinel-type structure. It is made of oxides of iron, manganese, zinc and their salts by ceramic process.

It has a high starting permeability. It is generally used in the frequency range of 1 kHz to 10 MHz. It can be used to make cores, heads and antenna rods for inductors, transformers, and filters.

The crystal structure of ferrite is highly symmetrical and usually appears as cubic, tetragonal, and hexagonal crystal systems. Within these different crystal systems, ferrite crystals also differ in properties such as lattice constant, unit cell volume, and unit cell symmetry. The location and number of transition metal ions in a ferrite in the crystal structure also affect its physical and chemical properties.

In addition, the relative ratio between iron oxides and transition metal oxides can also have an impact on the properties of ferrites.

Depending on the process, ferrite permanent magnets can be divided into two types: sintered ferrite and bonded ferrite. Sintered ferrite can be divided into dry pressing and wet pressing, and bonded ferrite can be divided into extrusion, injection molding and calendering.

There are two families of ferrite permanent magnets: isotropic and anisotropic. According to different molding processes, anisotropic ferrites can be divided into dry pressing and wet pressing.

According to the classification of the main components, ferrite permanent magnets are mainly divided into barium ferrite and strontium ferrite. Barium ferrite is the most widely used permanent magnet material on the market.

Summary. A ferrite core is a sintered magnetic metal oxide composed of a mixture of various iron oxides. (Manganese-zinc ferrite and nickel-zinc ferrite are typical ferrite materials.)

Manganese-zinc ferrites are characterized by high permeability and high flux density, and have low losses at frequencies below 1MHz. Nickel-zinc ferrite has very high impedance, low permeability of less than a few hundred percent, and low losses at frequencies above 1 MHz. Ferrite cores are used in coils and transformers for a variety of electronic devices.

Whether the oxygen core contains iron oxide.

You're talking about ferrite cores.

A ferrite core is a sintered magnetic metal oxide composed of a mixture of various iron oxides. (Manganese-zinc ferrite and nickel-zinc ferrite are typical ferrite materials.) Manganese-zinc ferrites are characterized by high permeability and high flux density, and have low losses at frequencies below 1MHz.

Nickel-zinc ferrite has very high impedance, low permeability of less than a few hundred percent, and low losses at frequencies above 1 MHz. Ferrite cores are used in coils and transformers for a variety of electronic devices. )

The ferrite core is composed of many kinds of iron oxide, so its composition contains iron oxide.

Whether the iron oxide core belongs to iron oxide.

It doesn't belong. It is a complex oxide composed of iron oxide and some metal elements that remove it.

Other. It is not composed of pure iron oxide, so it does not belong to iron oxide.

There are three common oxides of iron: FeO, Fe2O3, and Fe3O4The most stable oxide at high temperatures is FeO (ferrous oxide).Fe3O4 is a mixed valence oxide with +2 and +3 valences of iron.

feo + 2 hcl = fecl2 + h2ofe2o3 + 6 hcl = 2 fecl3 + 3 h2ofe3o4 + 8 hcl = fecl2 + 2 fecl3 + 4 h2o

Fe2O3 + 3 CO== High temperature == 2 Fe + 3 CO2

comparison of magnet differences between ferrite and samarium cobalt magnets;

One. Appearance. Ferrite magnet: The ferrite magnet is relatively soft and has no metallic luster. Generally, it is not electroplating, and Tongchangye is often black.

Samarium cobalt magnets: metallic luster and high density.

Second, the magnetic aspect.

Ferrite: According to the survey data, the magnetic force of ferrite is generally 500-1700 gauss.

Samarium cobalt magnet: Under bare magnetic conditions, the magnetic force of cobalt magnet can reach about 2000 gauss.

Third, performance.

Ferrite magnet: Ferrite It has good temperature resistance and stability. Compared with NdFeB, the common temperature resistance is only 80 degrees. And it's cheap.

Samarium cobalt magnetic number of iron: Epoxy magnets have the characteristics of small size, light weight and strong magnetism, while magnetism is completely different from ferrite.

Fourth, there is the issue of cost.

Ferrite: Iron oxide is cheap, and many are calculated on a piece-by-piece basis. **Depends on the shape, size, and processing difficulty of the ferrite.

According to the different magnetic properties and applications, ferrite can be divided into five types: soft magnet, permanent magnet, gyromagnet, moment magnet, piezomagnetism.

1. Soft magnetic materials.

Such materials are easy to magnetize and demagnetize under a weak magnetic field, such as zinc-chromium ferrite and nickel-zinc ferrite. Soft ferrite is a ferrite material with wide use, many varieties, large quantity and high output value. It is mainly used as a variety of inductive components, such as filter cores, transformer cores, wireless cores, and tape recording and video recording heads, etc., and is also a key material for magnetic recording components.

2. Permanent magnet ferrite.

A compound with a hexagonal structure of uniaxial anisotropy. It is mainly barium, strontium, lead and its composite solid solution. There are homogeneous magnetism and heterosexual magnetism.

Because this kind of ferrite material can still retain strong constant remanence properties for a long time after the external magnetization field disappears, it can be used to generate a constant magnetic field to the external space. It is used in a wide range of applications, such as in various types of electricity meters, generators, generators, loudspeakers, televisions and microwave devices as a constant magnet.

3. Hard magnetic materials.

Ferrite hard magnetic materials are not easy to demagnetize after magnetization, therefore, they are also called permanent magnet materials or constant magnet materials. Such as barium ferrite, steel oxygen, etc. It is mainly used in recorders, pickups, speakers, magnetic cores of various instruments, etc. in telecommunication devices.

Fourth, the magnetic material.

The gyromagnetism of magnetic materials refers to the phenomenon that under the action of two mutually perpendicular stable magnetic fields and electromagnetic wave magnetic fields, the polarization plane of the plane-polarized electromagnetic wave propagates in a certain direction inside the material, but its polarization plane will continue to rotate around the direction of propagation. Although metal and alloy materials also have a certain degree of spinal magnetism, they cannot be used because of their low resistivity and too large eddy current loss, so electromagnetic waves cannot penetrate deep into their interior. Therefore, the application of gyromagnetic properties of ferrite gyromagnetic materials has become a unique field of ferrite.

Gyromagnetic materials are mostly composed of various microwave devices such as waveguides or transmission lines that transmit microwaves. It is mainly used in radar, communication, navigation, telemetry and other electronic equipment.

5. Moment magnetic material.

This refers to a ferrite material with a rectangular hysteresis loop. It is characterized by the fact that when there is a small external magnetic field, it can be magnetized and saturated, and after the external magnetic field is removed, the magnetism remains the same as when it was saturated. Such as magnesium manganese ferrite, lithium manganese ferrite, etc.

This ferrite material is mainly used in the memory cores of various electronic computers.

6. Piezomagnetic materials.

This kind of material refers to the ferrite material that is mechanically elongated or shortened in the direction of the magnetic field during magnetization, such as nickel-zinc ferrite, nickel-copper ferrite and nickel-chromium ferrite. Piezomagnetic materials are mainly used as transducers for the mutual conversion of electromagnetic energy and mechanical energy, and as magnetostrictive elements for ultrasound.

There are three common oxides of iron: FeO, Fe2O3, and Fe3O4The most stable oxide at high temperatures is FeO (ferrous oxide).Fe3O4 is a mixed valence oxide with +2 and +3 valences of iron.

feo+2hcl

fecl2h2o

fe2o3+6

hcl=2fecl3+3

h2ofe3o4+8

hcl=fecl2+2

fecl3+4

h2ofe2o3+3

co==high temperature==2fe

3co2