Ferrite magnets, also called ceramic magnets, have a high level of hardness, being more fragile and sensitive to possible beating or bending of the material in some of their handling processes. They are the most economical magnetic solution that can be found in several applications, thanks to their properties and their low cost.
Wide range of ferrite magnets with different working temperatures and very different geometric shapes such as blocks, discs or rings, according to need.
We can check the characteristics of the ferrite magnets in the following table of qualities. It indicates the remanence of the magnets, the coercive force, the working temperatures and the minimum and maximum resistance.
CONSULT QUALITY TABLE
|Grade||Nomenclature||Remanence||Coercive force||Intrinsic coercive||Maxium energy product||Working temp|
|Br||bHc||Fuerza Ihc||(BH) max|
|Ferrite Magnets||Br max (T)||Br min (T)||HcB min (kA/m)||HcB max (kA/m)||HcJ min (kA/m)||HcJ max (kA/m)||BHmax min (kJ/m³)||BHmax max (kJ/m³)||Max. Temp. trabajo: (ºC)|
|HF 7/21 isotropic||Y10T||HF 7/21||0,20||0,22||125||145||210||250||6,5||8,0||250|
|HF 26/20 anistropic||Y30||HF 26/20||0,38||0,39||191||210||199||220||26,0||28,0||250|
|HF 27/23 anistropic||Y30BH||HF 27/23||0,38||0,39||223||235||231||245||27,0||30,0||250|
Type of material
Iron oxideBarium Ferrite or Strontium
From -40ºC to 250ºC
Economic magnetsGreat resistance to corrosionOutdoor application
Ferrite magnets are the cheapest in the market. Its visual appearance is of a metallic oxide of dark gray color. They have a great resistance to corrosion and therefore, they are one of the most appropriate products for different outdoor applications thanks to being stainless. They can also be exposed to temperatures of up to 250ºC. They are probably the best alternative to neodymium magnets, as they not only resist humidity and corrosion, but are also resistant to different types of chemicals.
The working temperature is a factor to be taken into account in the different uses that will be given to the magnet. In IMA we offer our customers a wide range of magnets that cover temperatures from -40ºC to 250ºC.
Ferrite magnets are not as strong as neodymium magnets, but their resistance to corrosion and a wider temperature range offer a large number of applications for our customers.
To obtain the ferrite magnet, first, it must undergo different phases of the production process, in this way to ensure its quality.
The process begins in obtaining the ferrite by heating a mixture of different metal oxides at high temperatures.
Once the ferrite is obtained, the product is ground into very small particles, so that each molecule has only one magnetic domain. The powder is pressed with a concrete shape and dry, in this way smaller and geometric shapes are achieved.
Next, the material obtained is subjected to sintering, in a situation with oxygen shortage. To avoid that the pieces stick with each other in the oven, we proceed to install some sheets that will make separators. This process is very important since it directly influences the magnetic properties of the ferrite and can cause cracks, bubbles and some deformation.