? ? ? ?Iron boron magnetic material is neodymium, iron oxide and other alloys. Also called magnetic steel. NdFeB contains a large amount of neodymium and iron, its properties are hard and brittle, easily oxidized and corroded. NdFeB has a very high energy product and coercive force, and the advantages of high energy density, the Nd-Fe-B permanent magnetic materials have been widely used in modern industrial magnet factory and electronic technology, so that the instrument, electro motor, magnetic magnetization devices such as miniaturization, lightweight, thin possible. The advantages of NdFeB is cost-effective, with good mechanical properties; shortcomings in the Curie temperature of low temperature performance, easy powder corrosion, must adjust its chemical composition (adding cobalt high Curie temperature elements) and take the method of surface treatment (surface passivation is one of the current solution is good) can be improved, in order to meet the requirement of practical application.
? ? ? ?NdFeB alloys (i.e., Nd-Fe-B permanent magnets). In 1983, Japan and the United States also found that the neodymium iron boron alloy, known as the third generation of permanent magnetic material, when the Nd and Fe atoms were different re atoms and other metal atoms replace can be developed into a variety of compositions and properties of different Nd-Fe-B series permanent magnetic material. The main preparation methods are sintering method, reduction diffusion method, melt rapid quenching method, bonding method, casting method, etc. sintering process and bonding method are most widely used in production.
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