What kind of magnet
　　We know the type of magnet is a lot, but what kind of it? Xiao Bian here to say something simple, the permanent magnet is generally divided into two categories and soft, we are talking about magnets, generally refers to the permanent magnets.
While the permanent magnet is divided into two major categories:
　　The first category are: metal alloy magnets include neodymium magnets Nd2Fe14B), samarium cobalt magnets (SmCo), aluminum-nickel-cobalt magnets (ALNiCO).
The second category are: ferrite permanent magnet material (Ferrite).
　　1, NdFeB magnets: it is found in the commercialization of the highest performance magnets, known as magnetic king, have extremely high magnetic its biggest energy product (BHmax) higher than the ferrite (Ferrite) more than 10 times. Machining performance itself is also very good. Operating temperature up to 200 degrees Celsius. And its hard texture, stable performance, good price, so its application is extremely broad. But because of its chemical activity is very strong, it must deal with its surface coating. (E.g. plating Zn, Ni, electrophoresis, passivation, etc.).
　　2, ferrite magnets: It is mainly raw materials, including BaFe12O19 and SrFe12O19. Manufacturing method made by ceramic technology, texture rather hard, is a brittle material, since the ferrite magnets have good temperature resistance, low cost, moderate performance, has become the most widely used permanent magnets.
　　3, alnico magnet: is an alloy of aluminum, nickel, cobalt, iron and other trace metal elements. Casting process can be processed into different sizes and shapes, good workability. Cast aluminum nickel and cobalt permanent magnet has the lowest reversible temperature coefficient, working temperature up to 600 degrees Celsius. Alnico magnet products are widely used in various instruments and other applications.
　　4, samarium cobalt (SmCo) on the basis of different components into SmCo5 and Sm2Co17. Because of its materials are expensive and their development is limited. Samarium cobalt (SmCo) as a rare earth permanent magnet, not only has a higher energy product (14-28MGOe), reliable coercive force and excellent temperature characteristics. Compared with NdFeB magnets, SmCo magnet is more suitable for working in high temperature environments.