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Ceramic magnets, also called ferrite core magnets, are hard and permanent magnets with low costs. The composition of ceramic magnets includes iron oxide and strontium carbonate. They exhibit medium magnetic strength and can be used at fairly high temperatures. Read More…
Ceramic MagnetsCeramic magnets, or ferrite magnets, are the most common magnet used in industrial applications.
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Ceramic magnets are resistant to oxidation and typically do not require additional protective finishes or coatings. In addition, they are resistant to corrosion and easy to magnetize. This makes them a popular choice for most consumers in industrial, commercial, and technical applications.
A wide range of shapes is available for these magnets, including block (rectangular and square), disc, round cup, and ring magnets.
Chemical Composition of Ceramic Magnets
Ceramic magnets are a type of permanent magnet with a composition of the chemical compound ferrite, composed of ceramic materials and iron oxide (Fe2O3). The chemical composition of ceramic magnets is SrO-6(Fe2O3).
Ceramic magnets are made from the following raw materials: iron oxide and strontium. Every ceramic magnet has a composition of 10% strontium carbonate and 90% iron oxide. These raw materials are economically available in abundance.
The Manufacturing Method of Ceramic Magnets
Ceramic magnets are produced by calcining a mixture of strontium carbonate and iron oxide to form a metallic oxide. A multiple-stage milling operation reduces the material that has been calcined to small particle size.
Two methods are then used to compact the powder in a die. In the first method, the compaction of the powder is done dry. This will develop an isotropic magnet that exhibits weaker magnetic properties but with better tolerances in dimensions. Most often, a magnet that is dry pressed does not require finishing grinding.
In the second method, the powder is mixed with water to form a slurry. A die is used to compact the die in a magnetic field. The field that has been applied creates an anisotropic magnet exhibiting superior magnetic properties, but it usually requires finish grinding.
To achieve the individual particles’ final fusion, the parts that have been compacted to approximate the finished geometry are sintered at high temperatures. Finally, diamond abrasives are used to achieve the final shaping.
Types of Ceramic Magnets
The different types of ceramic magnets include:
Ceramic Permanent Magnets
These are commonly seen small black magnets. The main raw materials that are used in the manufacture of these types of ceramic magnets are barium carbonate, iron oxide, or strontium carbonate. The residual magnetic field’s intensity increases after magnetization and can be maintained for a long time.
Soft Ceramic Magnets
These types of ceramic magnets are prepared by the sintering of ferric oxide and one or several metal oxides. The metal oxides include zinc oxide, strontium oxide, barium oxide, magnesium oxide, manganese oxide, nickel oxide, etc.
These types are called soft ceramic magnets because when the magnetic field disappears, the size of the residual magnetic field becomes small or almost non-existent. They are often utilized as choke coils or in intermediate transformers as the core. This is different from the permanent type ceramic magnets.
Gyromagnetic Ceramic Magnets
These are kinds of ferrite materials that exhibit gyromagnetic properties. Rotary magnetism of magnets is the phenomenon that planar polarized electromagnetic waves’ polarization surface rotates around the direction of propagation in the course of propagation.
This occurs in a specific direction in the material under the action of two perpendicular DC magnetic fields and magnetic fields of electromagnetic waves. Gyromagnetic ceramic magnets are mostly utilized in microwave communications.
Applications and Benefits of Ceramic Magnets
The different applications and benefits of ceramic magnets include:
Applications of Ceramic Magnets
Magnetic assemblies designed for holding, lifting, retrieving, and separating
Breaks and clamps
Motors and generators
Eddy current devices
Benefits of Ceramic Magnets
Ceramic magnets are produced at low costs.
Their intrinsic coercivity is much higher than that of Alnico magnets. This, in turn, makes them better at resisting demagnetization from external magnetic fields.
Ceramic magnets exhibit high magnetic permeability, which makes them capable of storing stronger magnetic fields than metallic magnets.
They are available in simple shapes because of the manufacturing process.
Their service temperature is lower than that of Alnico.
Ceramic magnets are lower energy products than Alnico magnets.