Neodymium Iron Boron Magnets
Known as Rare Earth magnets, Neodymium Iron Boron magnets are alloys of the Lanthanide group of elements. NdFeB magnets offer the highest energy product per unit mass, and highest energy product per unit cost of any current permanent magnet material. Energy Products range from 30 to 55 MGOe, with recommended operating temperatures from 80º - 230ºC, and the temperature coefficient of residual induction ranges from -0.09 to -0.13%/°C.
BJA Magnetics prepares its anisotropic powders by either casting an alloy melt into a mold, or strip casing. Strip Casting offers the advantage of better chemical stability. Subsequently, the ingot from the mold or the flakes from Strip Casting are pulverized to a uniform grain/particle size. The best method for obtaining the desired grain size is by HDDR. The HDDR [hydrogenation-decomposition-desorption-recombination] process yields a more homogenous particle size with a minimum of α-Fe, and Nd-rich phases. Anisotropic Nd-Fe-B, HDDR powders prepared from strip cast alloys are used for the HAST [Highly Accelerated Stress Test] grades of NdFeB Magnets, including N, H, SH, UH, EH, and BJA Magnetics exclusive “W” grades for WindPower applications.
When you purchase your NdFeB magnets from BJA Magnetics, you receive the following benefits:
Improved Corrosion Resistance – The HAST protocol used on uncoated neodymium iron boron magnets can qualitatively reflect the service life of the magnet. This test exposes the magnet to 130°C, 95% RH, at 2 ATM for 20 days. The magnet is massed before and after the test. Our magnets measure a weight loss of less than 3 mg/cm2. Competitors’ magnets can loose 10 times this much or more.