Process for producing rare-earth-iron-boron permanent magnet alloy powder by reduction diffusion

Abstract

A process for preparing permanent-magnet RE-Fe-B alloy powder by reduction-diffusion method includes such steps as choosing raw materials, pretreating, proportioning, mixing RE oxide, Fe powder, Ca, CaH2, NdCl3 and CaCl3, thermal reducing and diffusion alloying at 820-960 deg.C, chemical separating, dewatering, drying and preparing anisotropic RG-Fe-B magnet.

Description

technical field

[0001] The invention belongs to the technical field of magnetic materials, and in particular provides a method for manufacturing rare earth permanent magnetic alloy powder. Background technique:

[0002] Nd-Fe-B series rare earth permanent magnet is a kind of permanent magnet material with excellent performance, which has two types: sintered and bonded. Bonded R-Fe-B magnets can be made into thin, special-shaped and can be integrally formed with the device. They have the characteristics of high precision, high material utilization rate, and good charging and demagnetization characteristics. Currently, the magnetic powder used for bonding R-Fe-B permanent magnets The preparation techniques include quick quenching method (US4802931, US4851858) and HDDR method. The rapid quenching method is based on high-purity metal neodymium, high-purity iron, boron or boron-iron alloy as raw materials, vacuum smelted into R-Fe-B master alloy, and then remelted, the melt is s...