The application of magnets is becoming more and more extensive.
From high-tech products to relatively simple packaging magnets, the most widely used ones at present are still neodymium-iron-boron magnets and ferrite magnets.
Looking at the development history of magnets, at the end of the 19th century and the beginning of the 20th century, people mainly used carbon steel, tungsten steel, chromium steel, and cobalt steel as permanent magnetic materials. At the end of the 1930s, the development of Alnico magnets made large-scale applications of magnets possible.
In the 1950s, the emergence of barium ferrite magnets not only reduced the cost of permanent magnets but also broadened the application range of permanent magnetic materials to the high-frequency field. In the 1960s, the appearance of samarium-cobalt permanent magnets opened up a new era for the application of magnets. In 1967, Strnat et al. from Dayton University in the United States developed samarium-cobalt magnets, marking the arrival of the era of rare earth magnets. So far, rare earth permanent magnets have gone through the first generation SmCo5, the second generation precipitation-hardened Sm2Co17, and developed to the third generation Nd-Fe-B permanent magnetic material. At present, ferrite magnets are still the permanent magnetic material with the largest consumption, but the output value of neodymium-iron-boron magnets has greatly exceeded that of ferrite permanent magnetic materials. The production of neodymium-iron-boron magnets has developed into a major industry.
