Multiplex rare-earth ferroalloy (RERAFe#-[2]) powder and method for preparing same

Abstract

The invention involves more than a kind of Yuan thin crude iron (RERAFe2) to gather the diamond dust and its the preparation method, should gather the diamond dust at least wilfully to select two kinds in oxidized rare earth Nd2O3, Dy2O3, Tb4O7, to make the oxidized rare earth blend for the raw material according to per cent by weight processing, then joins calcium metal grain of Ca again, powdered iron Fe, the chlorination salt (NaCl or CaCl2), makes the oxidized rare earth two blends according to the per cent by weight mix, this two blends take the reducing agent by the calcium metal grain of Canada chlorination salt, after stirs, the argon Ar clean positive pressure protection heats up carries on the return to original state proliferation response, soaks after cooling with the NH4Cl watery solution to the solution assumes the brown, Again uses the acetic acid watery solution to clean the PH value to assume the neutrality, finally filters except the moisture content and drying namely makes gathers the diamond dust. Should gather the diamond dust to be possible to take the key metal preparation rare earth permanent-magnet material, has the craft simply, the production cost low, the non- environmental pollution, the metal content is stable controllably, the alloy returns-ratio higher characteristic.

Description

technical field [0001] The invention relates to the field of new materials, in particular to a multi-element rare earth iron (RERAFe 2 ) alloy powder and its preparation method. Background technique [0002] Rare earth permanent magnet materials (NdFeB), mainly made of rare earth metals such as neodymium, iron and boron, are prepared by powder metallurgy, and are widely used in electronics, machinery and other industries, especially high-performance materials, which are more important in the defense industry. , its market prospect is extremely broad. In order to greatly improve the magnetic properties of rare earth permanent magnet materials (NdFeB), especially the intrinsic coercive force and thermal stability, a small amount of rare earth metals and rare earths are often added during the powder metallurgy smelting of rare earth permanent magnet materials (NdFeB) to improve The thermal stability of the rare earth permanent magnet material (NdFeB), that is, its magnetic pr...

AI Technical Summary

Problems solved by technology

However, the simple use of calcium as a reducing agent has the following disadvantages: the reduction product calcium oxide has a melting point as high as 2600 ° C and is still solid at the reduction temperature, which hinders the diffusion of rare earth metals and can even reduce the rare earth metals that have been reduced. Contained by calcium oxide, it not only makes it difficult to purify the alloy, but also prevents it from forming rare earth iron alloys with metallic iron

Therefore, in order to form a multi-component rare earth iron alloy with a fixed composition, the amount of rare earth oxide added is greater than the theoretical amount, usually 110%-120% of rare earth oxide is added, thereby greatly increasing the production cost

Among the above-mentioned rare earth functional materials, the rare earth metals and rare earths are all added in the form of pure metals, which cannot be melted quickly during the freezing process, the recovery rate of the alloy is low, and the production cost is high. Metal loss, as the preparation of rare earth permanent magnet materials, the composition of the formula is out of balance, which affects the magnetic properties of semi-finished products