High energy gasification/atomization of Fe#-[3]B/R#-[2]Fe#-[14]B nanometer composite permanent magnet powder and its preparation method

Abstract

The invention makes public a kind of composite nanometer Fe3B / R2Fe14B permanent magnetism powder by high-energy gas atomizing and the method of making it. Transform the alloy fluid, whose atomic composition formulary is Rx(Fel-wCow)100-x-y-xByTz, into ball powder by high-energy gas atomizing. Then dispose it and get composite nanometer Fe3B / R2Fe14B powder based on Fe3B by hot crystallization. The R is at least one component as following: Nd, Pr, Dy, and Tb. The T is at least one of the following components: Zr, Nb, Cr, Ga, Ti, V and Si. And the proportion should be:3.0<=x<=6.0,8<=y<=22,0<=z<=5,0<=w<=0.5. The powder made by this method has advantages such as glaze, ball shape, good fluidity and low cost, and is especially fit for adhesive binding magnet by injection molding.

Description

technical field

[0001] The invention relates to the field of magnetic materials, in particular to a high-energy gas atomization Fe 3 B / R 2 Fe 14 B nanocomposite permanent magnet powder and its preparation method. The permanent magnet powder prepared by the method has the advantages of smooth surface, spherical shape and good fluidity, and is especially suitable for injection molding bonded magnets. Background technique

[0002] NdFeB rare earth permanent magnet material, as the third generation permanent magnet material, has been widely used in high-tech products such as computers, mobile phones, audio equipment, and motors due to its small size, light weight, strong magnetism, and high cost performance. NdFeB permanent magnet materials can be divided into sintered NdFeB and bonded NdFeB, both of which have their own advantages and disadvantages. Sintered NdFeB has better magnetic properties, but the production process is more complicated and the cost is correspondingly ...