Grade 8 Disc Ceramic Magnet
There are also many kinds of magnets, such as circular magnets, u-shaped magnets and bar magnets. Although they are all magnets, their characteristics and functions are different.
Because circular magnet magnetization direction is different, so much so that it with general bar magnet, u-shaped magnet is differ, circular magnet polarity is different, depending on the specific circumstances to test, if it is a circle on the horn type magnet, on this circle is not north and south poles, because of its special shape, magnetic cancel out the ends of the magnetic, want you to see it going up is flat on both sides of magnetic poles.
Because the circular magnet in the shape of a special, allowing it to get more powerful force of adsorption, no gap adhesion make it more close to, when work is not easy to loosen, security, and close all got a qualitative leap. Therefore, it can play a role for people in more fields and help people perform better auxiliary functions. People create high-tech to and from science and technology to help their own physical factor, the magnet is with high natural material, but people at the time of use of it to innovate in order to get more help, this is people using circular magnet for the upgrade.
Ceramic magnets, in fact, are ferrite, a new type of nonmetallic magnetic material developed in the 1940s. Because the preparation process and appearance are very similar to ceramics, it is sometimes called magnetic porcelain. Ferrite is usually a compound oxide of iron family and other one or more suitable metallic elements, belonging to a semiconductor, which is used as a magnetic medium.
Sintering temperature of ferrite material, generally is about 1000 ~ 1400 ℃. The surrounding atmosphere has great influence on the properties of ferrite sintering. As mentioned above, the solid phase chemical reaction during the formation of ferrite cannot be carried out in the reducing atmosphere. Therefore, the sintering of ferrite material is usually carried out in an electric furnace (kiln) heated by silicon carbon rod. For some special requirement of ferrite materials, must be in special sintering furnace, such as high permeability of manganese zinc ferrite, must be sintered in vacuum furnace, yig polycrystalline ferrite must be above 1400 ℃ sintering furnace. Chemical and physical changes occur during sintering.