With the development of the society, the application of the magnet is becoming more and more widely, from high-tech products to the most simple packaging, the most widely used or ndfeb magnets and ferrite magnets.
From the development history of the magnet, the end of the 19th century in the early 20th century, the main use of carbon steel, tungsten, cobalt chromium steel and steel for permanent magnetic material.
Developed in the late 1930 s, alnico magnets, makes the magnet the large-scale application of possible.
50 s, the emergence of barium ferrite magnets, reduces the cost of permanent magnets, and to broaden the application scope of permanent magnet materials to high frequency field.
To 60 s, samarium cobalt permanent magnet, is for the application of the magnet has opened up a new era.
In 1967, the United States at the university of Dayton Strnat etc. , to develop into a samarium cobalt magnet, marks the arrival of the era of rare earth magnets.
Rare earth permanent magnet has experienced the first generation of SmCo5, the second generation Sm2Co17 precipitation hardening type, development to the third generation of Nd -
B permanent magnet materials.
Far the largest permanent magnet ferrite magnet is still the dosage, but the ndfeb magnet production is much more than ferrite permanent magnet, ndfeb magnet production has developed into a big industry.
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