NdFeB magnet-magnetic materials-permanent magnet materials

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NdFeB permanent magnet material is the third generation permanent magnet material successfully developed after the metal system and ferrite system. Rare earth permanent magnet materials have been developing rapidly since their advent in the 1980s. According to the chronological order of their development and application, they can be divided into four generations. The first generation is system materials, the second generation is system magnets, and the third generation is system magnets. The NdFeB magnetic material successfully developed in the early 1990s quickly replaced NdFeB magnets in many fields due to its excellent performance and lower price, and soon realized industrial production. The fourth generation is rare earth iron. Nitrogen series and rare earth iron-carbon series
are still in the state of research and development. Samarium cobalt permanent magnet is the first developed rare earth magnet magnetic material. It has the characteristics of high Curie temperature and high coercive force. However, its development is greatly restricted because it contains expensive strategic metal cobalt. The current usage remains at tons, mainly used in the military field
Rare earth iron nitrogen permanent magnets mainly refer to samarium iron nitrogen compounds and neodymium iron nitrogen compounds originally invented by Yang Yingchang in my country, and have high magnetic properties
And corrosion resistance, due to process problems, there are currently few applications. NdFeB magnets were invented in 2008, at a critical moment when computer office automation and home appliances were popularized and miniaturized. There was an urgent need for powerful magnets. NdFeB magnets not only have high magnetic properties, but are also low-priced. It has brought revolutionary changes to
magnets, and at the same time, the global computer communications and other industries have developed rapidly. At present, NdFeB magnetic materials are the main force and are the well-deserved king of permanent magnets.