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【 Dongguan permanent magnet divides two major categories: 】

by:Newland     2020-05-02
【 Dongguan permanent magnet divides two major categories: 】 Permanent magnets and points two categories: the top categories are: metal alloy magnets containing ndfeb magnets Nd2Fe14B) , samarium cobalt magnet ( SmCo) , aluminum nickel and cobalt magnet ( ALNiCO) The second major categories are: ferrite permanent magnet material ( Ferrite) 1, ndfeb magnet: it is now found that magnet, the highest commercial function known as magnetic king, has the extremely high magnetic features the maximum magnetic energy product ( BHmax) Above ferrite ( Ferrite) More than 10 times. Its own mechanical processing function is also quite good. Operating temperature up to 200 degrees Celsius. And it is strong, function stability, has good cost performance, so its widely used extreme. But because of its strong chemical activity, so it is necessary for its appearance with polish layer processing. ( Such as zinc plating, Ni, electrophoresis, passivation, etc. ) 。 2. Ferrite magnets: it is the main raw material containing BaFe12O19 and SrFe12O19. Legal system through the ceramic technology, quality of a material is hard and brittle materials, because of the ferrite magnets have good temperature resistance, low cost, function is moderate, has become the most widely used permanent magnet. 3. Alnico magnets, is made from aluminum, nickel, cobalt, iron and other trace metal elements constitute a kind of alloy. Casting process to produce processing into different dimensions and shapes, machinability is good. Casting aluminum nickel and cobalt permanent magnet has the lowest temperature coefficient is reversible, operating temperature can be as high as 600 degrees Celsius above. Alnico permanent magnet products are widely used in all kinds of instruments and meters and other categories. 4, samarium cobalt ( SmCo) According to the composition of different divided into SmCo5 and Sm2Co17. Because its material is expensive and make it carry out limited. Samarium cobalt ( SmCo) As a rare earth permanent magnets, not only have higher magnetic energy product ( 14 - 28 mgoe) , coercive force and the temperature of the outstanding properties of solid. Compared with the ndfeb magnets, samarium cobalt magnet is more suitable for operation in high temperature environment. Two, the history of the magnet: with the development of the society, the use of the magnet is more and more widely, from high-tech products to the most simple packaging, now is still the most widely used ndfeb magnets and ferrite magnets. From the perspective of a magnet in history, the end of the 19th century in the early 20th century, the main use of carbon steel, tungsten, cobalt chromium steel and steel for the permanent magnet materials. Developed in the late 1930 s, alnico magnets, to make possible mass use of magnet. 50 s, the emergence of barium ferrite magnets, reduces the cost of permanent magnets, and widening the application range of the permanent magnet material to the high-frequency category. To 60 s, samarium cobalt permanent magnet, is for the use of magnet pioneer 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. So far, dilute the top 10 permanent magnet has experience generation SmCo5, the second generation of sedimentary type hardening Sm2Co17, carry out to the third generation of Nd - Fe- B permanent magnet materials. Ferrite magnets now is still the most consumable permanent magnet material, but the ndfeb magnet production has exceeded ferrite permanent magnet material, ndfeb magnet yield has been carried out into a big industry. Strong magnets, magnets, magnet, magnet, ndfeb magnet, rare earth permanent magnets
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