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China Ceramic Magnet, Ferrite Magnets |
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Ferrite magnets, also known as ceramic magnets, are kinds of permanent magnets which are mainly made from iron oxide and barium/strontium carbonate by ceramic processing technology. Ferrite magnets are one of the essential and basic magnetic materials for electronics industries and they have been universally applied in motors, transformers, magnetic controls, inductors coiling in electronic devices, loudspeakers, toys, crafts and etc.
Ferrite magnets are hard and brittle; as a result, they need special machining process when producing them. The manufacturing process and processing technology of ferrite magnets are similar to the one of ceramic; therefore, ferrite magnets are also called ceramic magnets by many people. Ferrite magnets can be manufactured by die pressing and then sintering which provides an economical means of production of various shapes and sizes. There's also bonded ferrite magnets (injection ferrite magnets), but the commonly used are sintered ferrite magnets.
Ferrite magnets are the most commonly used permanent magnet materials due to their low cost, easy to produce, excellent corrosion and demagnetization resistance properties. Ferrite magnets can be produced either isotropic or anisotropic. Ferrite grade 1 is an isotropic grade with equal magnetic properties in all directions. Ferrite grades 5 and 8 are anisotropic grades. Anisotropic magnet must be magnetized in the direction of pressing.
Ferrite magnets have high coercive force, a good balance of magnetic strength, excellent corrosion resistance and are easily machinable. By strength, ferrite magnets are stronger than Alnico magnets but weaker than neodymium magnets and Samarium Cobalt magnets. Its normal operating temperature is between -40℃ and 250℃. Ferrite magnets are the most widely used magnet today, can be found in a wide variety of applications:
◆Automotive applications
◆Industrial and consumer motors
◆Industrial holding applications
◆Material handling
◆Computer peripherals
◆Speakers
What's the prospect of ferrite magnets in rare earth price surge tide? As we know, magnetic material is the basic material for industries and information industry, and its development has been supported by Chinese government according to her industrial policy. Ferrite magnet material accounts for about ninety percent of the permanent magnet materials share, while the rest market is shared by neodymium iron boron magnet and other magnets. On the whole, ferrite magnets and neodymium magnets have their own ways of developing in diversified area. While in some intercrossed fields, it's hard for neodymium magnets to become a real threat of ferrite magnets' already existing market due to the raw materials' cost variance. The price of rare earth has experienced a sharp rise since 2010, up to now the price of neodymium magnets is twentyfold to thirtyfold than the price of ferrite magnets.
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