Hot-pressed and hot-deformed nanocomposite (Nd,Pr,Dy)/sub 2/Fe/sub 14/B/α-Fe-based magnets

Abstract

Fully dense isotropic and anisotropic (Nd,Pr,Dy) 2 Fe 14 B/ -Fe nanocomposite magnets have been successfully prepared by a hot press and hot deformation technique using melt-spun precursors. For the fully dense, hot-deformed, anisotropic nanocomposite (Nd,Pr,Dy) 2 Fe 14 B/ -Fe-based magnets containing 4 vol% and 11 vol% -Fe, the maximum energy products have reached 31 and 24 MGOe, respectively. At the time of proofreading for this paper, 42 MGOe has been reached for the nanocomposite magnets with~4 vol% -Fe.

Magnetism of ordered and disordered alloys of R2Fe14B (R = Nd, Er) type

“…Synthesis of exchange-spring nanocomposite magnets was also realized by spark erosion [7], hot pressing at 600-800°C under pressure of 100-200 MPa in vacuum [8] and some other methods.…”

Nd-rich Effects on Structural and MagneticProperties of Nd<sub>2</sub>Fe<sub>14</sub>B Magnets

“…The methods of the preparation also have been developed time to time. The newest nanocrystalline magnetic materials based on Nd-Fe-B alloys prepared by the rapid quenching of the liquid, known as exchange-coupled nanocrystalline composite hard magnetic materials [2,3,4,5,15].…”

Investigation of magnetic properties of MnBi/Co and MnBi/Fe65Co35 nanocomposite permanent magnets by micro-magnetic simulation

“…The main barrier to get high maximum energy products for rare earth free permanent magnets, such as MnBi magnets, is the low saturation magnetization of 0.78 T [1] at room temperature, which restricts the practical application of the magnets. Exchange spring magnets (nanocomposite permanent magnets) proposed by Kneller and Hawing [2] in 1991have aroused much interest for their giant energy product in theory [3], good corrosion resistance, excellent fracture toughness and low fabrication cost [4,5]. Skomski and Coey predicted the famous giant energy product based on the hard/soft multilayers with in-plane anisotropy [3].…”