Magnetic properties of NdFeB-coated rubberwood composites

Abstract

Magnetic properties of composites prepared by coating lacquer containing neodymium iron boron (Nd-Fe-B) powders on rubberwood were characterized by vibrating sample magnetometry (VSM), magnetic moment measurements, and attraction tests with an iron-core solenoid. The Nd-Fe-B powders were recycled from electronic wastes by the ball-milling technique. Varying the milling time from 20 to 300 min, the magnetic squareness and the coercive field of the Nd-Fe-B powders were at the minimum when the powders were milled for 130 min. It followed that the coercive field of the magnetic wood composites was increased with the milling time increasing from 130 to 300 min. For the magnetic wood composites using Nd-Fe-B obtained from the same milling time, the magnetic squareness and the coercive field were rather insensitive to the variation of Nd-Fe-B concentration in coating lacquer from 0.43 to 1.00 g/cm³. By contrast, the magnetization and magnetic moment were increased with the Nd-Fe-B concentration increasing. Furthermore, the electrical current in the solenoid required for the attraction of the magnetic wood composites was exponentially reduced with the increase in the amount of Nd-Fe-B used in the coating.

Keywords

composite materials / magnets / wood / ball milling / coatings / magnetization / coercive field

References

[1] Oka H., Hojo A., Osada H., Namizaki Y., Taniuchi H. Manufacturing methods and magnetic characteristics of magnetic wood. J. Magn. Magn. Mater., 2004, 272–276(3): 2332.

[2] Oka H., Tokuta H., Namizaki Y., Sekino N. Effects of humidity on magnetic and woody characteristics of powder-type magnetic wood. J. Magn. Magn. Mater., 2004, 272–276(2): 1515.

[3] Hayakawa H., Osada H., Kano A., Taniuchi H., Sawabe O. Laminated impregnated magnetic wood manufacturing methods and magnetic characteristics from dc to 13.5 GHz band. IEEE Trans. Magn., 2002, 38(5): 3327.

[4] Sia C.K., Sasaki Y., Adachi N., Ota T. The magnetic properties of porous Ni-Zn ferrites prepared from wood templates. J. Ceram. Soc. Jpn., 2009, 117(1369): 958.

[5] Oka H., Hamano H., Chiba S. Experimental study on actuation functions of coating-type magnetic wood. J. Magn. Magn. Mater., 2004, 272–276, e1693.

[6] Chen Z.A., Sui Y.L., Guo Z.M. Magnetic properties of Nd₂Fe₁₄B/α-Fe nanocomposite magnets with yttrium addition. Rare Met., 2010, 29(3): 265.

[7] Chen Z.A., Luo J., Guo Z.M. Effect of Dy substitution on the microstructure and magnetic properties of nanograin Nd-Fe-B single-phase alloys. Int. J. Miner. Metall. Mater., 2010, 17(3): 335.

[8] Bao X.Q., Li W., Zhu J., Gao X.X., Zhou S.Z. Enhancement of magnetic properties and thermal stability of nanocrystalline (NdDyTb)_12.3(FeZrNbCu)_81.7B_6.0 alloy with Co substitution. Int. J. Miner. Metall. Mater., 2009, 16(6): 696.

[9] Zhang X.H., Xiong W.H. Effect of bonding process on the properties of isotropic epoxy resin-bonded Nd-Fe-B magnets. Rare Met., 2009, 28(3): 248.

[10] Suryanarayana C. Mechanical alloying and milling. Prog. Mater. Sci., 2001, 46(1–2): 1.