The history of NdFeB Magnets

　　NdFeB Magnets metal has the following characteristics: First, greatly enhance the coercive force of the magnet, the magnetic coercive force of up to 15.2-21Koe maximum energy product 30MGOe; Second, is particularly stable to temperature than conventionalthe stability of the permanent magnetic material has increased threefold; Third, it has a strong corrosion resistance, corrosion resistance than conventional materials twice.

　　The Sagawa real invention Japan production of NdFeB Magnets metal material to catch up with the United States, not only in the short term than the United States.

　　However, the U.S. General Electric Company's technicians can not endure, as the Japanese catch up in 1990, they also proposed a new system of permanent magnet material law NdFeB Magnets orientation of the sheet material. This method is first used the melt spinning quenching prepared isotropic ribbon silt, and then the granule by plasma spray gun is heated into a paste, pushed to by the pair of rear plus the gap to rotate the wheel, then pressure into a powder sheet, thereby forming a quality having anisotropic magnetic material. Such operation after the material of the invention is superior Bi Zuochuan real.

　　Sagawa Reality is not far behind, significant improvements in their own invention to propose a new measure, he added a small amount of copper in the NdFeB Magnets, would greatly broaden the heat treatment temperature range of high coercivity, add copper magnet optimum heat treatment temperature range from about 10 degrees, widened to 300 ℃, Thus, a system of a better permanent magnet.

　　Worth mentioning is that the competitive boom of the permanent magnetic material, our scientists also have new contribution, they create a new sintering method, NdFeB Magnets,a sintering instead of the traditional sintering and heat treatment by induction heating, so that, so that the sintering of the magnet within 5min density reaches more than 95% of the theoretical value, the maximum energy product more than 280kg/m3, the sintering time is considerably shorter than the conventional technique, therefore, can avoid the magnet grain growth is too large, the same time, it is also possible greatly to shorten the production cycle, so that the production costs reduced accordingly.