Ferrite magnets are fabricated by calcining the mixture of Barium carbonate (BaCO3) or Strontium carbonate (SrCO3) and iron oxide (Fe2O3) to form a metallic oxide. Almost all of ferrite arc magnet is used in motor applications. As the core component of the permanent magnet direct current (DC) motor, ferrite arc magnet is commonly used in the motors of household electrical appliance, automotive, and power tools. Ferrite magnets have excellent temperature stability which can be utilized up to 250 degrees Celsius besides superior corrosion resistance.
Machining Process of Ferrite Arc Magnet
Ferrite magnet is a type of porous insulating material which composed of many grains and pores. Sintered ferrite magnet is almost impossible to achieve near net-shape manufacturing, then process a certain machining is necessary. As a hard and brittle material, ferrite magnet can be only machined by grinding, slicing, and polishing technology to satisfy specified dimensional accuracy, geometric tolerance, and roughness. The most common shape of the ferrite magnet includes block, disc, ring, and segment, then magnet manufacturer must select suitable machining technology according to product requirements. Unlike Neodymium arc magnet or SmCo arc magnet with good conductivity, wire-cutting process is not applicable to ferrite magnet, therefore, its machining is basically completed through copy grinding technology.