China Magnets Basic knowledge, history, classification of china magnets industry, types of magnets neodymium magnets, ferrite magnets, smco, alnico,rubber magnets, injection magnets
Basic knowledge, history, classification of China magnets. types of magnets China magnets industry includes sintered neodymium magnets (sintered ndfeb magnets), bonded neodymium magnets (bonded ndfeb magnets), ferrite magnets, rubber magnets, smco magnets, alnico magnets, injection magnets, etc.
Basic knowledge of China magnets
Magnet is a kind of material can attract or repel each other, the component is iron, cobalt, nickel and other atoms. Magnet categories: samarium cobalt magnet, ndfeb magnet, ferrite magnets, alnico magnets, iron chromium cobalt magnet, ring magnets, square magnet type, and so on. The atom itself has a magnetic moment, general these minerals molecular arrangement confusion. Influence each other just don’t show the magnetic magnetic area, but in the external force (such as a magnetic field) guided by molecular orientation trend is consistent, just show magnetic, also known as the magnet. Iron, cobalt, nickel, is the most commonly used magnetic materials, permanent magnet with soft iron magnet points, basically a permanent magnet is coupled with strong magnetic, make the spin of magnetic materials and electronic angular momentum into fixed direction arrangement, soft magnetic is (is also a kind of soft magnetic is combined with current and a magnetic method), such as current remove soft magnetic iron will slowly lost. People didn’t invent the magnet, there is a natural magnetite, the earliest discovery and use of magnet should be Chinese. So “compass” is one of the four great inventions of the Chinese.
History of China magnets
The pre-qin period chinese ancestors have accumulated a lot of knowledge in this magnets field, in exploring often encountering magnetite iron ore mine (main ingredient is ferroferric oxide). These findings were recorded very early. The earliest records said: “the mountains have a magnet, always together with copper and gold.” Other ancient books, such as “shanhaijing” have similar records. Iron absorption properties of a magnet was found early, then they called “magnetic” as “kindness” because they thought a magnet attracts iron as a loving mother for their children. And said: “the stone is the mother of iron, and the stone with magnet is full of love.
Classification of China magnets (Types of magnets)
Many different kinds of magnets, generally divided into two types: permanent magnets and soft magnets. What we call the magnets, generally refers to the permanent magnets. Permanent magnets divides into two major categories:
The first major categories are: metal alloy magnets including neodyimium magnet (NdFeB, Nd2Fe14B) , samarium cobalt magnet (SmCo), aluminum nickel cobalt magnet (ALNiCO). The second major categories are: Ferrite permanent magnet (Ferrite)
1. Ndfeb magnet
Ndfeb magnet is found that the highest performance magnets Known as the king of magnets, 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 coating on the surface layer. (such as zinc plating, Ni, electrophoresis, passivation, etc.)
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. ==>See category to Buy Ferrite magnet
alnico magnetalnico magnetalnico magnetalnico magnet
It is made from aluminum, nickel, cobalt, iron and other trace metal elements. Casting process can make Alnico into different sizes and shapes, machinability is good. Casting aluminum nickel and cobalt permanent magnet has the lowest reversible temperature coefficient , 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)
smco magnet high temperature smco magnet sm2Co5 magnet ring sm2co17 magnet
according to the composition of difference divided into SmCo5 and Sm2Co17. 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 to 28 MGOe), reliable, coercive force and good temperature characteristics. Compared with the ndfeb magnets, samarium cobalt magnet is more suitable for working in high temperature environment.