Neodymium, praseodymium, dysprosium and yttrium multi-element rare earth alloy permanent magnet material and preparation method

Abstract

The formula of a neodymium, praseodymium, dysprosium and yttrium multi-element rare earth alloy permanent magnet material is Re alpha Re' beta Re'' eta B delta Cu zeta Al epsilon Fe gamma. The neodymium, praseodymium, dysprosium and yttrium multi-element rare earth alloy permanent magnet material is characterized in that Re represents Nd and Pr, Re' represents Dy, Re'' represents Y, Fe represents Fe and inevitable impurities, alpha, beta, eta, delta, zeta, epsilon and gamma represent mass percent contents of the elements respectively, the sum of alpha, beta and eta is larger than or equal to 30 and smaller than or equal to 32, the sum of beta and eta is larger than or equal to 5 and smaller than or equal to 12, eta is larger than or equal to 3 and smaller than or equal to 7, delta is larger than or equal to 1.02 and smaller than or equal to 1.09, zeta is larger than or equal to 0 and smaller than or equal to 0.24, epsilon is larger than or equal to 0.33 and smaller than or equal to 0.67, and 100 minus alpha, beta, delta, zeta and epsilon equals to gamma. According to the neodymium, praseodymium, dysprosium and yttrium multi-element rare earth alloy permanent magnet material, the problem that segregation happens to alloy ingots obtained through melting due to element melting point difference and manual operation factors in the traditional melting process is effectively solved, actual coercive force of the alloy ingots is easily improved due to addition of Dy, Y can partly replace Nd and Pr, and production cost is reduced for enterprises; in addition, alpha-Fe influencing performance of the permanent magnetic material can be effectively avoided, and performance of the alloy ingot material is improved.

Description

technical field [0001] The invention relates to the technical field of rare earth permanent magnet materials, in particular to a neodymium-praseodymium-dysprosium-yttrium multi-component rare-earth alloy permanent magnet material and a preparation method thereof. Background technique [0002] The traditional rare earth metal extraction process will eventually obtain a single rare earth metal oxide, and the permanent magnet material required to be prepared will be obtained after various processes such as proportioning smelting; and the permanent magnet produced by this traditional process has many defects. , and the production process is difficult to control, and there are many human factors, which in turn affect the quality of mass production. Taking NdFeB as an example, the praseodymium, neodymium, iron, boron and other components separated by extraction are mixed and then added to a vacuum melting furnace for melting, and alloy ingots are obtained after melting. Affected ...

AI Technical Summary

Problems solved by technology

[0002] The traditional rare earth metal extraction process will eventually obtain a single rare earth metal oxide, and the permanent magnet material required to be prepared will be obtained after various processes such as proportioning smelting; and the permanent magnet produced by this traditional process has many defects. , and the production process is difficult to control, and there are many human factors, which will affect the quality of mass production

Taking NdFeB as an example, the praseodymium, neodymium, iron, boron and other components separated by extraction are mixed and then added to a vacuum melting furnace for melting, and alloy ingots are obtained after melting. Affected by factors such as the uniformity of the previous mixing and the control of the time interval and amount of artificial addition, it will inevitably cause segregation of the alloy ingot material after smelting, and even affect the performance of the alloy ingot material and the effect of the subsequent process. The technical requirements of personnel are relatively high, and the labor intensity is high; in the preparation of traditional process methods, vacuum reduction melting furnaces are required, which cannot be realized by ordinary electrolytic furnaces. This requires relatively high production equipment for enterprises, resulting in relatively large initial production investment

In addition, the permanent magnet materials produced by the existing production process have low actual coercive force, low working temperature stability, and weak corrosion resistance, which have become the main factors limiting their development and application.