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Alnico magnets as they are known consist of alloys: Al (aluminum) Ni (nickel) Co (cobalt), hence Al-ni-co, with additional alloys, iron, copper and titanium and other elements to enhance heat treatment in magnetic properties. They were developed in late 1930’s and commercially available in the early 1940’s. Some of the trade name alloys are: Alcomax, Alni, Arnox, Columax, Hycomax, and Lodex. Read more
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, Anisotropicmagnets 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. After the compaction into the dies the parts are exposed to a high temperature, a process known as sintering. Read more
Bonded Neodymium magnets are manufactured through the compression process. This process involves mixing neodymium powder with epoxy as a binder and pressing it into a die cavity with no magnetic field, thus making these magnets Isotropic. Pressed parts are then placed into the oven for curing. Compression bonded neodymium magnets are an excellent choice over other magnet types (sintered neodymium, sintered samarium cobalt, and hard ferrites) that have limits to some shapes that compression bonded magnets do not have. With their high energy product reaching up to 12 MGOe it makes them ideal for many applications requiring high magnetic strength and tight tolerances. Since no magnetic field is applied during the compression the finished product can be magnetized in any direction. Read more
Injection Molded Neodymium Iron Boron (NdFeB) magnets are manufactured by an injection process of pre-mixed magnetic powder with thermoplastic binders e.g. Nylon 6 or 12 or Polyphenylene Sulfide (PPS) which produces an accurate and homogeneous magnetic part. Through this process various shapes of magnets can be directly molded into or over the components e.g. shafts, cams, inserts and the like eliminating some steps in assembly. With the injection mold process very complex shaped magnets can be achieved with extremely tight tolerances and a broad range of magnetic properties and characteristics. Read more
MAGNET types
Sintered Neodymium (NdFeB), the lanthanide series of elements in the periodic table, also known as a second generation rare earth magnet, are the most powerful magnets available today with outstanding magnetic properties. By some, they are considered exotic materials, even though significant amounts of ore deposits are found around the world. The two most commonly known rare earth magnets are: Sintered Neodymium Iron Boron (NdFeB) simply known as Neo’s and Samarium Cobalt (SmCo) magnets known as Cobalt magnets. Due to their high magnetic strength extreme caution should be taken during handling and assembly. Read more