A kind of processing method of neodymium magnet adding yttrium element

Abstract

The invention discloses a method for processing neodymium magnets added with yttrium element, and relates to the field of multi-alloy permanent magnet preparation methods. The method comprises the following steps: taking alloy raw materials according to the alloy formula, and vacuum smelting; performing quick solidification casting of the obtained alloy; and casting the obtained casting The alloy powder is obtained by mixing hydrogen crushing and jet milling; the alloy powder is prepared into a green body in a magnetic field press; the green body is sintered and heat-treated to obtain a neodymium magnet added with yttrium; the alloy formula includes the following elements: Pr, Nd, Y, B, Fe. According to the processing method of neodymium magnets added with yttrium element provided by the present invention, the magnetic properties of the obtained products can reach the original medium and high performance indicators, and the magnets have lower oxygen content and better corrosion resistance, and can save about 5-10% of praseodymium, neodymium, dysprosium and terbium and other metals, reducing costs by 5‑10%. And make better comprehensive utilization of rare earth resources.

Description

technical field [0001] The invention relates to the field of preparation methods of multi-alloy permanent magnets, in particular to a method for processing neodymium magnets added with yttrium element. Background technique [0002] A permanent magnet is a magnet that can retain a high remanence for a long time in an open circuit state. NdFeB permanent magnet material is based on the intermetallic compound Nd 2 Fe 14 B-based permanent magnet material. Compared with cast Al-Ni-Co permanent magnet materials and ferrite permanent magnet materials, NdFeB has extremely high magnetic energy product and coercive force, and can absorb heavy objects equivalent to 640 times its own weight. The advantages of high energy density make NdFeB permanent magnet materials widely used in modern industry and electronic technology. With the rapid growth of new rare earth materials such as neodymium iron permanent magnet materials, the rapid development of the rare earth industry has been stim...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems that the addition of metal yttrium to a single alloy will lead to a substantial decrease in the remanence and energy product of the magnet, the invention provides a compound addition of low-cost metals, which has low requirements for production and processing technology, and reduces the cost of permanent magnet material preparation as a whole. And the scheme that does not affect the overall performance of the permanent magnet material is as follows: