8/17/2023 0 Comments Cobalt restaurant range![]() ![]() NdFeB typically has about 1.5% cobalt added to improve corrosion resistance a little bit, but that is a very small percentage of cobalt compared to what’s in SmCo magnets. Iron has very poor corrosion resistance unless corrosion-resistant metals are added to it. NdFeB magnets are about 65% iron (iron is ferromagnetic as mentioned above). Cobalt is one of the three naturally ferromagnetic elements besides To see that cobalt is a big reason the corrosion resistance of SmCo magnets is Cobalt is a major component of stainless steel, so it is easy The Crystal Structure of SmCo5 on the left and Sm2Co17 on the right.You can learn more by reading our post about magnetic isotropy. When a material property is so concentrated in a single direction like this, it is called anisotropic. These crystal structures tightly concentrate the magnetic field in the north-south direction. Both types of structures give highly directional magnetic properties to rare earth magnets. The crystal structure of SmCo is hexagonal, and NdFeB is tetragonal. SmCo and NdFeB have very similar crystal structures. The process steps for rare earth magnets include mining, production of powder, milling, pressing, annealing, cutting, grinding and surface finishing. The major steps of the process of making Neodymium magnets at BJMT’s own high-tech facility can be found here. Manufacture, which is nearly identical to the manufacture of Neodymium magnets. Similar in many respects to Neodymium magnets. They are used for many high-tech purposes, such as automotive electric drive motors, smart speakers, smart phones (see our article on NdFeB magnets in smartphones smart speakers and IOT devices here), sensors and many more applications. Rare Earth magnets are the strongest known permanent magnets. The Neodymium magnet also has a very small amount of Boron, which makes it different from a SmCo magnet since NdFeB uses three major alloying elements but SmCo uses only two. So each magnet is the result of a rare earth metal and a transition metal bonding together. And Neodymium is alloyed with Iron –a transition metal. Samarium is alloyed with Cobalt –a transition metal. They are called are rare earths, because Samarium and Neodymium are both found in the Lanthanide series of metals on the Periodic Table, so the properties and crystal structures of these magnets are very similar to each other. Samarium Cobalt ( SmCo5 or Sm2Co17) and Neodymium-Iron-Boron ( Nd2Fe14B) are both Rare Earth Magnets –the strongest known rare earth permanent magnets. ![]() What are RareĮarth Magnets -and What are They Used For? As with many engineering materials, there are some finer details to consider in any trade study between two materials.ĭo you like this post? Many readers also like our post on Neodymium vs Ferrite Magnets. There are other important similarities and differences between SmCo and NdFeB magnets we will examine more closely, but these are the biggest considerations. They are both very strong magnets with very high BH Max (Maximum Energy Product) and high Coercivity (resistance to demagnetization) and they are both commercially important on a large and growing scale. SmCo and NdFeB magnets also have important similarities. Neodymium magnets have a much stronger magnetic field –with the highest BH Max of any permanent magnet available today –and they are cheaper than SmCo. So what are the basic differences between SmCo and NdFeB? SmCo magnets operate better than NdFeB magnets at higher temperatures and in more corrosive environments than Neodymium magnets. Here we break down the important similarities and differences so you can quickly decide which is right for your application. Many people want to understand how to use them, so we wrote this guide. Samarium Cobalt magnets and Neodymium Iron Boron magnets are important Rare Earth Magnets. ![]()
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