Magnetic field orientation compacting is referred to utilize the interaction between magnetic powder and the external magnetic field to align powder along the easy magnetization direction and make it consistent with the final magnetization direction. Magnetic field orientation compacting is the most common path to manufacture anisotropic magnet. Samarium Cobalt alloy or Neodymium Iron Boron alloy has been crushed into the single crystal particle in previous jet milling process. Single crystal particle is uniaxial anisotropy and each of them has merely one easy magnetization direction. Magnetic powder will transform into the single domain from multi-domain under the action of external magnetic field after loosely filled into mold, then adjust its easy magnetization direction c-axis to be consistent with external magnetic field direction via rotating or moving. C-axis of alloy powder basically retained its arrangement status during compacting process. Compacted parts should proceed demagnetization treatment before demolding. The most important index of compacting process is orientation degree. Orientation degree of sintered Neodymium magnets or sintered Samarium Cobalt magnet is determined by various factors, include orientation magnetic field strength, particle size, apparent density, compacting method, compaction pressure, etc.
