A kind of low-cost rare earth-free nanocomposite permanent magnetic material and preparation method thereof

Abstract

The invention provides a low-cost rare-earth-free nanocomposite permanent-magnetic material and a preparation method thereof. A chemical formula of the low-cost rare-earth-free nanocomposite permanent-magnetic material is Mn<53-x>Al<45>C<2>W<x> / (Fe<l-y>Co<y>)<2>B. The preparation method comprises the steps of: burdening a pure metal raw material according to the name of an Mn<53-x>Al<45>C<2>W<x> alloy to obtain a master alloy ingot and fabricating a thin strip; carrying out vacuum heat treatment on a quick quenched strip to obtain a tau-phase Mn<53-x>Al<45>C<2>W<x> alloy; carrying out burdening according to (Fe<l-y>Co<y>)<2>B alloy ingredients to obtain the master alloy ingot and fabricating the thin strip; carrying out high-energy ball-milling on the quick quenched strip of the Mn<53-x>Al<45>C<2>W<x> alloy and the quick quenched strip of the (Fe<l-y>Co<y>)<2>B alloy which are subjected to heat treatment to prepare nanocrystalline alloy powder; carrying out spark plasma sintering on the obtained nanocomposite powder to obtain a full-dense nanocomposite permanent-magnetic material; and carrying out thermal deformation on the sintered nanocomposite permanent-magnetic material, improving the degree of orientation and obtaining the low-cost rare-earth-free anisotropic nanocomposite permanent-magnetic material. The prepared permanent-magnetic material does not contain a rare-earth element; the raw material cost is effectively reduced; and meanwhile, the technology is simple, easy to operate and suitable for large-scale mass production.

Description

technical field

[0001] The invention relates to the technical field of magnetic materials, in particular to a low-cost rare earth-free nanocomposite permanent magnet material and a preparation method thereof. Background technique

[0002] High-performance permanent magnet materials have been widely used in military equipment, electro-acoustic devices, motors, generators, computer hard disk drives, voice coil motors, nuclear magnetic resonance imaging instruments, microwave communication technology, controllers, instruments and other devices that require permanent magnetic fields and in the device. Rare earth intermetallic compound permanent magnet is currently the best permanent magnet material. For example, the energy product of samarium-cobalt-based magnets has exceeded 30MGOe, and that of NdFeB permanent magnets has reached 59.5MGOe. However, rare earth permanent magnet materials make these high-performance magnets expensive due to their high raw material costs. At the...