Oxygen magnet steel is an important magnetic material with many excellent properties such as high coercivity, high magnetic permeability, and low magnetic mismatch rate. This article will introduce the manufacturing methods, classification and characteristics of ferrite magnets.
1. Manufacturing method
The manufacture of ferrite magnets requires first mixing iron oxide and iron alloy powder, and adding a certain amount of other metal oxides (such as titanium, aluminum, zinc, etc.) as additives to make a magnet whose main components contain Fe2O3, M (oxidized mixture). The mixture is then heated to a high temperature, causing a reduction reaction to produce ferrite crystals. Finally, the manufacturing of ferrite magnet steel is completed through sintering, magnetization, shaping and other processes.
2. Classification
Ferrite magnets can be mainly divided into two categories: hard ferrite and soft ferrite.
①Hard ferrite: Also known as high coercivity ferrite, it has the characteristics of high coercivity and high magnetic permeability, and is widely used in various motors, electrical appliances, sensors and other fields.
②Soft ferrite: Also known as low coercivity ferrite, it has the characteristics of low coercivity and low magnetic mismatch rate, and is mainly used in electronic components, transformers and other fields.
3. Feature introduction
Ferrite magnets have the following characteristics:
①High coercive force: The coercive force of hard ferrite can reach 1200 kA/m, which is 2-3 times that of traditional ferromagnetic materials.
②High magnetic permeability: Ferrite magnets have high magnetic permeability, which can reach 19000-20000 Gs/Oe, which can effectively improve magnetization efficiency.
③Low magnetic mismatch rate: Ferrite magnet steel has a low magnetic mismatch rate, which can make the magnetic lines of force conduct better longitudinally and improve the magnetic properties of the material.
④Excellent stability: Ferrite magnets have good thermal stability, chemical stability and mechanical stability, and can maintain their magnetic properties unchanged for a long time.
