The method to reduce the cost of Neodymium Magnets

　　In recent years, due to the sharp rising of the rare earth metal price, which is used in permanent magnets, it causes the continuous rising of neodymium magnets formula.

　　While embryo and finished product’s prices also have a certain degree of increase, but relative to profit space, it has some reduce, so that each manufacturer has a active exploration and research on rare earth metals in addition to praseodymium neodymium. The commonly used is the metal gadolinium iron.

　　First of all, for the N file materials, in N30, N33 production, use 30% gadolinium to instead of praseodymium neodymium, which can make the formula cost greatly reduced. In the milling process, particle size should be controlled in 3.8 - 4.2um. Oxygen content is controlled in 100 - 200PPm ( airflow grinding powder ), in the process of sintering and tempering temperature at 580℃ for 2.5 to 3.5 hours, can be Br11.3, 11.6KGs, Hcj13.5, 15.5Koe, ( BH ) m29 - 32MGOe, HK/Hcj > =92% rare earth permanent magnet, in N33, N35 production, using 20% GD instead of praseodymium neodymium, airflow grinding particle size control in 3.6 - 4.0um, oxygen content control in 100 - 200PPm, the sintering process of intermediate tempering temperature at 520℃ for 2.5 to 3.5 hours, such as components of at%PrNd26%, Ga6.5%, B1.15%, A10.4%, Cu0.15%, Fe, in the process of production conditions, can achieve Br11.9, 12.1KGs, Hcj13, 15Koe, (BH ) M34 - 36MGOe, HK/Hcj > =95% rare earth permanent magnet. For N38, N40 production, can also be used for 15% - 5% of the gadolinium instead of praseodymium neodymium, can also be obtained with the quality standard of permanent magnets' material.