2results about How to "Improve squareness" patented technology

The application discloses a modified slow-release rare earth alloy, a sintered neodymium-iron-boron magnet and a preparation method thereof. 1‑m X m , m is an atomic percentage content, 35at%<=m<=76at%; wherein, RE is a rare earth element, composed of light rare earth elements and heavy rare earth elements; X is selected from at least one of Ga, In, Si, Ge, Sn, Sb, Bi, S, Se and Te. The modified slow-release rare earth alloy can improve the magnetic performance and high-temperature stability of the sintered neodymium-iron-boron magnet.

The present application relates to sintered Nd-Fe-B rare earth permanent magnet material technical field, specifically to a kind of preparation process of gallium cobalt double-element regulated inorganic fluoride grain boundary diffusion neodymium-iron-boron magnet.The process will be pretreated sintered Nd-Fe-B magnet as matrix, inorganic fluoride powder and gallium source are first ball milled in anhydrous system, form Ga-F interface fixed intermediate slurry;Then add cobalt source and cooperate into film agent, dispersing agent to obtain sequential fixed type composite diffusion source slurry, after coating on the surface of magnet, by low-temperature oxygen-free pre-conversion, grain boundary main diffusion and segmented tempering to obtain modified magnet.The present application is conducive to control the contact sequence and migration state of gallium and cobalt in diffusion source particles, so that neodymium-iron-boron rare earth permanent magnet material can improve intrinsic coercivity while maintaining good remanence, demagnetization curve squareness and high temperature stability.