Sintered neodymium iron boron has greatly expanded the application potential of permanent magnet materials, widely used in fields such as transportation, energy, communication, home appliances, machinery, and medical treatment. It is playing an important role in new energy and artificial intelligence, and has become an indispensable functional material in production and daily life.     Sintered neodymium iron boron magnets are mainly used in automobiles (electric drive, electric power steering, sensors, etc.), wind power generation, information industry (hard disk drives, optical disk drives), consumer electronics (mobile phones, digital cameras), household appliances (variable frequency air conditioning, refrigerators, and washing machines), clothing bags, precision instruments, etc., as well as intelligent manufacturing and driving represented by drones and robots Artificial intelligence fields such as intelligent services.