Magnetic property enhancement of directly quenched Nd–Fe–B bulk magnets with Ti substitution

Composition dependence of magnetic properties of directly quenched Nd–Fe–Ti–Zr–B bulk magnets

“…In our previous studies [17,18], magnetic properties of B r = 6.5 kG, i H c = 10.3 kOe, and (BH) max = 8.7 MGOe were obtained for directly quenched Nd 9.5 Fe 72.5 Ti 3 B 15 magnets with a diameter of 0.7 mm and a length of 15 mm. However, increasing the diameter of the magnet to 0.9 mm degraded the magnetic properties to B r = 6.0 kG, i H c = 6.2 kOe, and (BH) max = 5.6 MGOe, because the grain size becomes coarser and the size distribution turns out to be inhomogeneous in the magnet due to its slower cooling rate.…”

“…Alloy ingots with nominal compositions of NdyFe97−y−zTi3−xZrxBz (x = 0-3; y = 7-10; z = [14][15][16][17][18][19] were prepared by arc melting mixtures of pure Nd, Fe, M metal and pure B crystal in an argon atmosphere. 5% excess Nd was adopted to compensate the loss of Nd during processing.…”

“…Additionally, to make sheet specimens with larger area size, Tan et al [15] demonstrated Nd 5 Y 4 Fe 68 Zr 2 B 21 bulk magnets with the size of 0.8 mm × 10 mm × 50 mm, and nevertheless, the ordinary magnetic properties of i H c = 4.8 kOe and (BH) max = 5.4 MGOe were obtained. Meanwhile, in our previous studies [16][17][18], in order to further simplify manufacturing process for making isotropic magnet, by composition modification, directly quenched Pr 9.5 Fe 71. 5 to replace Ti in Nd 9.5 Fe 72.5 Ti 3 B 15 alloy based on Inoue's empirical rules [19] and our previous study [17].…”

Epoxy resin effect on anisotropic Nd–Fe–B rubber-bonded magnets performance

“…Isotropic Nd-Fe-B ring-shaped rubber-bonded magnets have been used in small motors and actuators for personal computers and peripherals. However, computers miniaturization inevitably stresses the importance of flexible bonded magnets with superior magnetic properties contributing to the overall computer size reduction [1][2][3][4][5][6][7][8][9][10][11].…”

The magnetic, structure and mechanical properties of rapidly solidified (Nd7Y2.5)–(Fe64.5Nb3)–B23 nanocomposite permanent magnet

“…The compositional modification and process optimization approaches have been employed to improve glass forming ability, structure and magnetic properties with (Nd, Pr) 3-9.5 -Fe bal -M 2-5 -B ; (M = Co, Mo, Nb, Ti, V, Zr) alloy systems [3][4][5][6]. The bulk nanocomposite permanent magnets in the rods form with 0.5-1.2 mm in diameter have been successfully developed by copper mold casting technique either in direct casting state or annealing the amorphous precursors [7][8][9][10]. The conventional way to develop a permanent magnet through copper mold casting is to make the amorphous alloy and then annealing it at 600-700 • C for 10-30 min.…”