Knowledge of automatic batching of magnetic materials - Magnetic material cognition

Published Time:

2022-04-20

Magnetic materials are closely related to our lives, from the most common refrigerator refrigeration to high-end maglev trains. So, let's take a look at this magical material! 1. Why do magnets have different magnetic properties? Matter is mainly composed of molecules, molecules are composed of atoms, and atoms are composed of atomic nuclei and electrons. Inside the atom, electrons revolve around and rotate the atomic nucleus, both of which produce magnetism. However, in most substances, the directions of electron motion are different and chaotic, and the magnetic effects cancel each other out. Therefore, most substances, under normal circumstances, do not seem to have magnetism.

Magnetic materials are closely related to our lives, from the most common refrigerator refrigeration to high-end maglev. So, let's take a look at this magical material!

1. Why do magnets have different magnetic properties?

Matter is mainly composed of molecules, molecules are composed of atoms, and atoms are composed of atomic nuclei and electrons. Inside the atom, electrons rotate and spin around the atomic nucleus, both of which produce magnetism. However, in most substances, the directions of electron motion are different and chaotic, and the magnetic effects cancel each other out. Therefore, most substances, under normal circumstances, do not seem to have magnetism.

Ferromagnetic materials such as iron, cobalt, nickel, or ferrite are different. The electron spins inside them can spontaneously arrange themselves within a small range, forming a spontaneous magnetic field, called a magnetic domain. When a ferromagnetic substance is magnetized, the internal magnetic domains are neatly and uniformly arranged, increasing the magnetic intensity, forming a magnet. The magnetization process of a magnet is the magnetization process of an iron block. The magnetized iron block has an attraction between the different polarities of the magnet, and the iron block is firmly "attached" to the magnet.

2. How do you define the properties of a magnet?

There are three main performance parameters to determine the performance of a magnet.

Remanence Br: After a permanent magnet is magnetized to technical saturation and the external magnetic field is removed, the remaining Br is called the residual magnetic induction intensity.

Hc: The reverse magnetic field strength required to reduce the B of a magnetized permanent magnet from technical saturation to zero is called the coercive force, also known as the coercive force.

Magnetic energy product BH: Represents the magnetic energy density established by the magnet in the air gap space (the space between the two magnetic poles of the magnet), that is, the static magnetic energy per unit volume of the air gap.

3. How are metallic magnetic materials classified?

Metallic magnetic materials are divided into two categories: permanent magnetic materials and soft magnetic materials. Generally, materials with intrinsic coercive force greater than 0.8kA/m are called permanent magnetic materials, and materials with intrinsic coercive force less than 0.8kA/m are called soft magnetic materials.

Tags:

Magnetic material knowledge sharing from an automatic batching manufacturer of magnetic materials

Reconstruction and Application of Refractory Material Automatic Batching System