Popov A.G.,RAS Institute of Metal Physics |
Shitov A.V.,RAS Institute of Metal Physics |
Gerasimov E.G.,RAS Institute of Metal Physics |
Vasilenko D.Yu.,Scientific Production Enterprise NeoMag |
And 5 more authors.
Physics of Metals and Metallography | Year: 2012
Pressless process used for the preparation of sintered Nd-Fe-B magnets has been studied. The effect of the average particle size D av, filling density ρ f, and powder-texturing conditions for obtaining density ρ and desired magnetic hysteretic properties of sintered magnets has been investigated for both traditional technology (TT) and low-oxygen technology (LOT). The ρ f magnitude ensuring the optimum relation between the density ρ of sintered magnets and their degree of texture was shown to be 2.5-3.0 and 2.2 g/cm 3 for the TT and LOT, respectively. At lower ρ f magnitudes, no required density of sintered magnets is reached, whereas at higher filling densities, a low level of texture and low remanence are realized. Optimum parameters of pulsed field inducing the high degree of texture in powders have been determined. The following properties were achieved for magnets prepared by pressless LOT: B r ≥ 14.2 kG, H c ≥ 8 kOe, and (BH) max ≥ 47.9 MG Oe. © Pleiades Publishing, Ltd., 2012.