Electric strong magnet

The magnet is a combination of a variety of magnetic materials, magnetic early still excellent company began developing the use of the magnet industry. A magnet can attract or repel each other mutually substance, if an object inside the small molecules can be aligned in the same direction, it will become a magnet. Component is iron, cobalt, nickel and other special atomic structure, atomic magnetic moment itself, the general confusion molecular arrangement of these minerals. Magnetic domain magnetic influence each other to not show, but external forces (such as magnetic field) molecular orientation under the guide to converge, on the show magnetic, also known as a magnet. Iron, cobalt, nickel, is the most common magnetic substance, basically divided permanent magnets and magnet soft iron, the permanent magnet is coupled magnetic, so that the electron spin angular momentum of a magnetic material arranged in a fixed direction, it is soft plus current (also a plus magnetic method), and other current will slowly get rid of soft iron loses its magnetism. Magnets are not invented, a natural magnetite, first discovered and use magnets should be Chinese. Therefore, the "compass" is one of the four great inventions of the Chinese people. 1. NdFeB magnets which 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, 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. It is the main raw materials include ferrite magnets 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, very good processability. Cast aluminum nickel and cobalt permanent magnet has a low 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.