Ferrite magnets are permanent magnets mainly made of SrO or BaO and Fe2O3. Compared with other permanent magnets, ferrite magnets are hard and brittle, and have lower magnetic energy. However, it is not easy to demagnetize and corrosion, the production process is simple and the price is low. Therefore, the output of ferrite magnets is the highest in the entire magnet industry and is widely used in industrial production.
Ferrite magnet is a sintered permanent magnet material composed of barium and strontium ferrite. In addition to strong anti-demagnetization performance, this kind of magnetic material also has the advantage of low cost. Ferrite magnets are hard and brittle, and require special machining processes. The opposite magnet is oriented along the manufacturing direction and must be magnetized in the direction taken, while the same magnet can be magnetized in any direction because it has no orientation, although a slightly stronger magnetic induction is often found on the side where the pressure is the smallest. The magnetic energy product ranges from 1.1MGOe to 4.0MGOe. Due to its low cost, ferrite magnets have a wide range of applications, from motors and speakers to toys and handicrafts, so they are currently the most widely used permanent magnet materials.
Features:
It is produced by powder metallurgy, with low remanence and low recoil permeability. The coercive force is relatively large, and the anti-demagnetization ability is relatively strong. It is especially suitable for the magnetic circuit structure used as a dynamic working condition. The material is hard and brittle, and can be used for cutting with emery tools.
Ferrite magnets are divided into anisotropic (anisotropic) and isotropic (isotropic). Isotropic sintered ferrite permanent magnet materials have weak magnetic properties, but they can be magnetized in different directions of the magnet; anisotropic sintered ferrite permanent magnet materials have strong magnetic properties, but they Pre-determined magnetization direction magnetization.
Difference from neodymium iron boron magnet
Ferrite magnet is a kind of metal oxide with ferromagnetism. In terms of electrical properties, the resistivity of ferrite is much larger than that of metal and alloy magnetic materials, and it also has higher dielectric properties. The magnetic properties of ferrite also show high permeability at high frequencies. Therefore, ferrite has become a non-metallic magnetic material with a wide range of applications in the field of high frequency and weak current.
The advantages of neodymium iron boron magnets are high cost performance and good mechanical properties; the shortcomings are that the Curie temperature is low, the temperature characteristics are poor, and it is easy to powder and corrode. It must be achieved by adjusting its chemical composition and adopting surface treatment methods. Improvements can meet the requirements of practical applications. NdFeB belongs to the third generation of rare earth permanent magnet materials. It has the characteristics of small size, light weight and strong magnetism. It is currently the magnet with the best performance-to-price ratio and is known as the magnet king in the field of magnetism. The advantages of high energy density make NdFeB permanent magnet materials widely used in modern industry and electronic technology.
