News

Home > News > Content
How Much Of The Powerful Magnet Is Radiated
Sep 20, 2017

How much of the powerful Magnet is radiated
   The terminology is that the Magnet of the powerful Magnet is smaller. So in the distance under the ordinary Magnet to provide the suction will be higher than the powerful Magnet. 30CM For a single Magnet, whether it is strong or ordinary, are unable to induce enough suction. Of course enough of the block arrangement can achieve this effect.
   Conventionally refers to ferrite or other materials. In fact, the powerful Magnets compared with ordinary Magnets, which is characterized by large field, the fold is about 4 times. Another feature is the high gradient. The gradient represents the change of the magnetic field per unit length. The surface field is infinitely long. For example, the magnetic field intensity decreases faster and the gradient is higher. On the other hand, the magnetic field of the powerful Magnet is more affected by the distance change.
First, many types of Magnets, generally divided into permanent Magnet and soft magnetic two categories, we are talking about the Magnet, generally refers to the permanent Magnet.
Permanent Magnet is divided into two categories:
The first categories are: metal alloy Magnets including NdFeB Magnets Nd2Fe14B), samarium cobalt Magnets (SmCo), alnico Magnets (ALNiCO)
The second category is: ferrite permanent Magnet material (Ferrite)
1, NdFeB Magnets: It is found that the highest commercial performance of the Magnet, known as the magnetic king, has a very high magnetic properties of its maximum magnetic energy product (BHmax) higher than ferrite (Ferrite) more than 10 times. Its own mechanical processing performance is also quite good. Operating temperature up to 200 degrees Celsius. And its texture is hard, stable performance, a very good price, so its application is extremely extensive. But because of its strong chemical activity, it must be its surface coating treatment. (Such as plating Zn, Ni, electrophoresis, passivation, etc.).
2. Ferrite Magnets: its main raw materials include BaFe12O19 and SrFe12O19. Made of ceramic technology, the texture is relatively hard, is a brittle material, because the ferrite Magnets have good temperature resistance, low price, moderate performance, has become the most widely used permanent Magnet.
3. Al-Ni-Co Magnet: an alloy of aluminum, nickel, cobalt, iron and other trace metal elements. The casting process can be processed to produce different sizes and shapes, and the workability is excellent. Cast aluminum nickel cobalt permanent Magnet has a minimum reversible temperature coefficient, the working temperature can be as high as 600 degrees Celsius. Alnico permanent Magnet products are widely used in a variety of instrumentation and other applications.
4, SmCo (SmCo) is divided into SmCo5 and Sm2Co17 depending on the composition. Due to the high cost of its materials and its development is limited. SmCo (SmCo) as a rare earth permanent Magnet, not only has a high energy product (14-28MGOe), reliable coercivity and good temperature characteristics. Compared with NdFeB Magnets, samarium cobalt Magnets are more suitable for working in high temperature environments.
Second, the history of the Magnet:
     Magnet application is more and more widely, from high-tech products to the most simple packaging magnetic, the most widely used or neodymium iron boron Magnets and ferrite Magnets. From the history of the development of Magnets, the late nineteenth century and early twentieth century, people mainly use carbon steel, tungsten steel, chrome steel and cobalt steel as permanent Magnet material. At the end of the thirties, the development of alnico Magnets made it possible for large-scale applications of Magnets.
In the 1950s, the appearance of barium ferrite Magnets reduced the cost of permanent Magnets and widened the application of permanent Magnet materials to high frequency. To the sixties, the appearance of SmCo permanent Magnet, then the application of the Magnet opened up a new era. In 1967, the United States Dayton University Strnat, etc., developed into samarium cobalt Magnet, marking the arrival of rare earth Magnets. So far, thin ten permanent Magnet has experienced the first generation of SmCo5, the second generation of precipitation hardening Sm2Co17, developed to the third generation of Nd-Fe-B permanent Magnet material. At present, the ferrite Magnets are still the largest amount of permanent magnetic materials, but the output value of NdFeB Magnets has greatly exceeded the ferrite permanent Magnet materials, NdFeB Magnets production has developed into a large industry.




Copyright © Wuxi Jinwei Permanent Magnet Co.,Ltd All rights reserved.Tel: +86-510-83781871