Commercial rare earth permanent magnet produced from high-abundance rare earth and preparing method thereof

Abstract

The invention discloses a commercial rare earth permanent magnet produced from high-abundance rare earth and a preparing method of the commercial rare earth permanent magnet. The commercial rare earth permanent magnet comprises a main phase and a grain boundary modification phase, wherein the main phase comprises low H (RE100-aMMa)-Fe-B alloy and high H Nd-Fe-B alloy. According to the commercial rare earth permanent magnet, two kinds of main alloy is adopted, the ingredients of the magnet are controlled, a stable 2:14:1 phase is formed by the high-abundance rare earth, and decomposing will not happen in the sintering process; the Cu element high in electrode potential is added into the grain boundary modification phase, the corrosion resistance of the magnet is improved, and meanwhile the microstructure of the magnet can be optimized by the grain boundary modification phase. According to the method, the two main alloy method is combined with the grain boundary modification technology, the advantages of both the two main alloy method and the grain boundary modification technology are achieved simultaneously, the problems that because of addition of the high-abundance rare earth, the corrosion resistance, the residual magnetism and the magnetic energy product of the magnet are reduced are solved, and the prepared rare earth permanent magnet meets the application requirements of commercial magnets.

Description

technical field [0001] The invention relates to the technical field of rare earth permanent magnet materials, in particular to a commercial rare earth permanent magnet produced by using high-abundance rare earth and a preparation method thereof. Background technique [0002] The proven industrial reserves of rare earth resources in the world are 9,900-10,000 tons. In 2008, the world's rare earth consumption was 130,000 tons. It is predicted that by 2015, the world's rare earth consumption will be about 21 tons. If the annual rare earth consumption is 300,000 tons According to calculations, the global light rare earth metals are only available for about 300 years. Moreover, with social development and scientific and technological progress, the amount of rare earths is increasing year by year, and the global rare earth resources are being consumed too quickly, leading to the "rare earth crisis theory". China is a major rare earth country in the world, so we should pay more at...

AI Technical Summary

Problems solved by technology

However, the ensuing corrosion problem in the application process more seriously limits the application of LaCe in rare earth permanent magnet materials.