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What is a permanent magnet?

by:Newland     2020-05-03
Many different kinds of magnets, generally divided into two types: permanent magnetic and soft magnetic, what we call the magnets, generally refers to the permanent magnet. Permanent magnet divides two categories: the first major categories are: metal alloy magnet ndfeb magnet Nd2Fe14B) , samarium cobalt magnet ( SmCo) , aluminum nickel and cobalt magnet ( ALNiCO) The second major categories are: ferrite permanent magnet material ( Ferrite) Commercialization of 1, ndfeb magnet, it is found that the highest performance magnets, known as magnetic king, has the extremely high magnetic to its maximum magnetic energy product ( BHmax) Above ferrite ( Ferrite) More than 10 times. Machining properties of its itself is also quite good. Working temperature up to 200 degrees Celsius. And the quality of a material is solid, stable performance, good cost performance, so its application is very extensive. But because of its chemical activity is very strong, so you have to handle with polish on the surface layer. ( Such as zinc plating, Ni, electrophoresis, passivation, etc. ) 。 2. Ferrite magnets: it is the main raw material includes BaFe12O19 and SrFe12O19. Manufactured by ceramic technology, the quality of a material is hard, brittle material, because of the ferrite magnets have good temperature resistance, low cost, moderate performance, has become the most widely applied permanent magnets. 3. Alnico magnets, is made from aluminum, nickel, cobalt, iron and other trace metal elements constitute a kind of alloy. Casting process can be processed into different sizes and shapes, machinability is good. Casting aluminum nickel and cobalt permanent magnet has the lowest temperature coefficient is reversible, working 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 application fields. 4, samarium cobalt ( SmCo) The different divided into SmCo5 and Sm2Co17: on the basis of composition. Because its material is expensive and make its development was restricted. Samarium cobalt ( SmCo) As a rare earth permanent magnets, not only have higher magnetic energy product ( 14 - 28 mgoe) And reliable coercive force and good temperature characteristic. Compared with the ndfeb magnets, samarium cobalt magnet is more suitable for working in high temperature environment. Magnets in use process shall ensure that the workplace is clean, in order to avoid iron tiny impurities such as adsorption on the surface of the magnet affect the normal use of the product. Ndfeb magnet is appropriate stored in ventilated dry room, acid, alkali, organic solvents, water, high temperature and wet environment magnet produces rust easily, powder coating fall off magnet demagnetization. To electroplating products, should be paid attention to more deposit can be appropriately apply antirust oil is, this is also we suggest that the main cause of ndfeb magnet surface anti-corrosion treatment. Store magnet should pay attention away from the disk, magnetic card, tape, computer monitors, sensitive to magnetic field objects, such as watches, electronic medical apparatus and instruments, such as the device for cardiac pacing should also far from, otherwise very dangerous. Magnet material of hard and brittle, in transport, the installation process, should ensure that magnets are not affected by severe impact, if improper method, easy to cause the breakage of the magnets, split. Should block magnet magnetization in a state of transportation, especially for air transportation must be completely blocked. Must be careful when handling assembly extraction individually, avoid knock against damage absorption, to prevent the magnet and impact of flying debris into the eyes, cause harm to human body. Because ndfeb magnetic very strong, the operation should avoid hand or other parts of the body by the magnet clips, for larger size magnets more should pay attention to the personal safety and protection. Strong magnetic magnet ( Ndfeb, samarium cobalt) Don't with weak magnetic magnet ( Aluminum nickel and cobalt and ferrite) Together, especially not reverse polarity, or weak magnetic magnet demagnetization easily.
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