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After the compaction into the dies the parts are exposed to a high temperature, a process known as sintering. This process allows them to hold the shape of the part and gives them mechanical and magnetic strength, and produces hard brittle parts. Because of their physical strength they should not be used as a structural part in any assembly. The grinding process using diamond grinding wheels allows for close dimensional tolerances. Ferrite (Ceramic) magnets have good resistance to demagnetization and with their high Curie temperature they have excellent high working temperatures and most of all they have excellent resistance to corrosion. Ferrite (Ceramic) magnets are excellent choices for many applications due to their economical low price and abundance of raw materials and they do not fluctuate much in price.They are the most widely used magnets in a wide range of applications. Ferrite (Ceramic) magnets come in a variety of shapes; round, square, rectangular, arc segments, triangle, rings and special shapes.
Hard ferrite magnets have a wide variety of applications: Speaker Magnets, DC Motors, Sweepers, Magnetic Separators for ferrous materials, Automotive Sensors, MRI’s, Reed Switching, Hall Effect Devices, in Assemblies such as (separating, holding, lifting, retrieving, and latching), Refrigerator Magnets and Arts and Crafts as well as many other novelty applications.
Hard Ferrite magnets are commonly known as Ceramic magnets due to the process used to produce them. Ferrite magnets are manufactured mainly of strontium or barium ferrites and iron oxide. Hard Ferrite (Ceramic) magnets are produced as Isotropic and Anisotropic types. Isotropic type magnets are produced without orientation and can be magnetized in any direction. On the other hand, Anisotropic magnets are exposed to an electromagnetic field during their process to achieve higher magnetic energy and properties. This is done by pressing dry powders or slurry into a desired die cavity with or without orientation.