Method for preparing nanometer amorphous low-neodymium complex phase neodymium iron boron

Abstract

The invention discloses a method for preparing nanometer amorphous low-neodymium complex phase neodymium iron boron. According to the method, low-neodymium magnetic phase and nanometer neodymium-rich phase are prepared separately, the prepared low-neodymium magnetic phase alloy powder is in crystal state and is dipped in mineral oil for oxidation protection, the prepared nanometer neodymium-enriched phase alloy powder is amorphous and is not easy to oxidize; the manner can effectively protect the low-neodymium magnetic phase and nanometer neodymium-enriched phase from being deoxidized, so that the content of rare earth is not increased in burdening; furthermore, the method is convenient to realize the purpose of manipulating and controlling micro tissue structure so as to prepare the nanometer low-neodymium complex phase neodymium iron boron, the material cost of neodymium iron boron is greatly lowered, the remanence and energy product of the neodymium iron boron are improved, and the coercivity of the magnet is relatively higher. The method also can regulate the property of the product by the mixing proportion of the low-neodymium magnetic phase powder and nanometer neodymium-rich phase powder, so as to produce different specifications of products and produce different products more conveniently.

Description

technical field [0001] The invention relates to a manufacturing method of nanometer amorphous low-neodymium complex-phase neodymium-iron-boron. Background technique [0002] NdFeB is a rare earth permanent magnet material that contains a large amount of rare earth elements neodymium, iron and boron. As a kind of rare earth permanent magnet material, NdFeB has extremely high magnetic energy product and coercive force. At the same time, the advantages of high energy density make NdFeB permanent magnet materials widely used in modern industry and electronic technology, so that The miniaturization, light weight and thinning of instruments and meters, electroacoustic motors, magnetic separation and magnetization and other equipment have become possible. [0003] At present, the traditional NdFeB production process includes the following steps: (1) batching, (2) flake processing, (3) hydrogen crushing, (4) jet milling, (5) forming and pressing, (6) sintering. NdFeB includes mai...

AI Technical Summary

Problems solved by technology

However, the rare earth elements in nanometer low neodymium composite NdFeB are reduced, and the remanence content is increased. The original NdFeB has the weakness of easy oxidation and high temperature resistance, and nanometer low neodymium composite NdFeB is easier to oxidize.

Therefore, the traditional process of preparing NdFeB powder cannot be used to prepare nanometer low-Nd composite NdFeB