Study of Electromagnetic Effect Parameters Influence on Fluidity of Fine Nd-Fe-B Powder

Abstract:

The paper experimentally proves the efficiency of electromagnetic effect on stimulated fluidity of magneto-hard powders. Fine Nd-Fe-B powder doesn’t have natural fluidity. To make it flow through hopper outlet we effected on the powder by constant and alternating gradient magnetic fields. Induction lines of constant magnetic field were horizontal, and alternating field lines were vertical. In order to form stimulated powder fluidity, higher induction gradient was situated below the powder receiver chamber. We experimentally found optimal magnetic fields parameters that form steady magneto fluidized bed from Nd-Fe-B powder, with an average particle size 1 μm. The study results of influence of magneto fluidized bed electromagnetic parameters on Ne-Fe-B powder efflux speed through outlets with diameters 1 and 2 mm are presented. Gradient field topology and parameters of electromagnetic effect providing minimal efflux time of 1000 mg of powder are defined.

• Periodical: Solid State Phenomena (Volume 299)
• Pages: 392-396
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.299.392
• Online since: January 2020
• Authors: Ivan N. Egorov*, Nikolay Ya. Egorov
• Keywords: Electromagnetic Effect, Fluidity, Magnetic Fields, Magneto-Fluidized Bed, Nd-Fe-B Powder

References

[1] I.V. Mitchell, Nd-Fe permanent magnets, Springer, Netherlands, (1986).

[2] J.M. Valverde, Fluidization of fine powders, Springer, Netherlands, (2013).

[3] J.M. Matsen, J.R. Grace, Fluidization, Springer, Netherlands, (1980).

[4] P.S. Raux, A.L. Biance, Cohesion and agglomeration of wet powders, J. Physical Review Fluids, 3 (2018).

DOI: 10.1103/physrevfluids.3.014301

[5] Yu.G. Dorofeev, V.Yu. Dorofeev, A.V. Babets, Technology of metallic powders manufacturing and their pressing, NGTU, Novocherkassk, (1999).

[6] B.S. Tyshkovsky, G.V. Blokhin, USSR Patent 1177053. (1985)/.

[7] L.P. Bobynin, N.I. Skurdin, USSR Patent 685436. (1974).

[8] N.K. Mikhaylov, V.A. Povidaylo, R.V. Yurevich, USSR Patent 1155468. (1985).

[9] S.S. Klimenkov, A.N. Krasovsky, A.S. Shandrikov, USSR Patent 1424969. (1985) (in Russian).

[10] D.D. Logvinenko, O.P. Shelyakov, V.L. Kireykova, Study of motion character of ferromagnetic particles in vortex layer, created by magnetic field, Poltava, (1972).

[11] M.K. Bologa, I.F. Marta, Magnetofluidization in rotary magnetic field, J. Magn. Hydrodynamics. 3 (1988) 103-108.

[12] Yu.A. Buyevich, S.V. Syutkin, V.V. Tetyukhin, To the theory of developed magnetofluidized bed, Magn. Hydrodynamics. 4 (1984) 3-11.

[13] D.D. Logvinenko, O.P. Shelyakov, Intensification of technological processes in devices with vortex layer, Technika, Kiev, (1976).

[14] I.D. Morokhov, L.I. Trusov, V.N. Lapovok, Physical phenomena in ultra-fine particulate media, Energoatomizdat, Moscow, (1984).

[15] I.N. Egorov, Study of electromagnetic effect on structure formation processes in magnetofluidized bed of ferrite particulate systems, Vestnik DGTU. 3 (2012) 44-50.

[16] N.Ya. Egorov, I.N. Egorov, Study of rheological features of magnetofluidized ferromagnetic medium, Techniczne nauki. 28 (2011) 26-28.

[17] B.I. Pirozhkov, Study of aggregation in magnetic liquids by the crossed fields method, Izv. AS USSR. 51 (1987) 1088-1093.

[18] I.N. Egorov, S.I. Egorova, G.F. Lemeshko, Structure formation in strontium hexaferrite powders, J. Vibro processes. 1 (2017) 81-83.

[19] I.N. Egorov, N.Ya. Egorov, Influence of magnetic field on ferrite particulate medium rheology, J. Prospero. 1 (2016) 44-48.

[20] I.N. Egorov, S.I. Egorova, Optimization of process of automated press-mold dozing process by ferromagnetic powders, J. Izvestiya vuzov, 1 (2018) 11-17.

[21] I.N. Egorov, S.I. Egorova, A.I. Cherniy, EA Patent 022640. (2016).