With the development of technology and technology, Magnetic Steel have become a very common strong material in our lives. By synthesizing alloys of different materials, the same effect as magnetite can be achieved, and the magnetic force can be improved. The rapid development of magnetic technology, strong magnetism The material also makes the components more compact.
Magnets are mainly divided into two categories, one is soft magnetic and the other is hard magnetic; soft magnetic includes silicon steel sheet and soft magnetic core; hard magnetic includes alnico, samarium cobalt, ferrite and neodymium iron boron. , The most expensive is samarium cobalt magnets, the cheapest is ferrite magnets, the highest performance is neodymium iron boron magnets, but the performance is the most stable, the best temperature coefficient is alnico magnets, users can follow Choose different hard magnetic products for different needs.
At present, the highest performance magnets are rare earth magnets, and among the rare earth magnets, neodymium iron boron is the most powerful magnet. But in an environment above 200 degrees Celsius, samarium cobalt is the most powerful magnet.
Neodymium iron boron magnets are commonly used high magnetic magnets, and their high magnetic properties are determined by the crystal structure. The third-generation rare earth permanent magnet NdFeB is the most powerful permanent magnet among contemporary magnets. Its BHmax value is 5-12 times that of ferrite magnets and 3-10 times that of alnico magnets; its coercivity is equivalent to 5-10 times that of ferrite magnets and 5 to 10 times that of alnico magnets. 15 times, its potential magnetic properties are extremely high, and it can absorb 640 times its own weight.
Since the main raw material iron of neodymium iron boron magnets is very cheap, the reserve of rare earth neodymium is 10-16 times more than that of samarium, so its price is much lower than that of samarium cobalt magnets. The mechanical properties of neodymium iron boron magnets are better than samarium cobalt magnets and alnico magnets, and it is easier to cut, drill and process complex shapes.
The disadvantage of neodymium iron boron magnet is its poor temperature performance, large magnetic loss when used at high temperature, and low maximum working temperature. Generally, it is about 80 degrees Celsius, and the maximum working temperature of a specially treated magnet can reach 200 degrees Celsius.
Because the material contains a large amount of neodymium and iron, this kind of magnet is easy to rust, so the neodymium iron boron magnet must be surface coated. It can be electroplated with nickel, zinc, gold, chromium, epoxy resin, etc.
Strong NdFeB Magnet are currently widely used in aerospace, electronics, electromechanical, instrumentation, medical and other fields. And the use of non-technical fields is becoming more and more widespread, such as adsorption magnets, toys, jewelry and so on.