High-corrosion-resistance permanent magnet rich in high-abundance rare earth and preparation method of high-corrosion-resistance permanent magnet rich in high-abundance rare earth

Abstract

The invention belongs to the technical field of permanent magnet materials, and particularly relates to a high-corrosion-resistance permanent magnet rich in high-abundance rare earth and a preparationmethod of the high-corrosion-resistance permanent magnet rich in the high-abundance rare earth. The high-corrosion-resistance permanent magnet rich in the high-abundance rare earth comprises a strongmagnetic phase and a crystal boundary rare-earth-rich phase, wherein the strong magnetic phase e is an MM-Fe-B phase, and the crystal boundary rare-earth-rich phase is an MM-Fe phase. According to the method for preparing the permanent magnet, through a double-alloy process, an MM-Fe-B main phase alloy and an MM-Fe auxiliary alloy are prepared, smelted and crushed to prepare powder; the preparedMM-Fe auxiliary alloy powder is added into the main alloy to be evenly mixed according to the mass percent of 1% to 5%; and orientation pressing, sintering and heat treatment are conducted, and the finally sintered magnet is obtained. MM-Fe is introduced in a crystal boundary, thus distribution of the crystal boundary rare-earth-rich phase can be optimized, the crystal boundary rare-earth-rich phase partially replaces an original crystal boundary phase prone to corrosion, the intrinsic corrosion resistance of the MM-Fe-B magnet is improved, through the method, the proportion of low-cost rare earth La / Ce in the magnet is further increased, the material cost is lowered, the technological process is simple, and the high-corrosion-resistance permanent magnet rich in high-abundance rare earth is suitable for scale production.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet materials, in particular to a high-corrosion-rich and high-abundance rare earth permanent magnet and a preparation method thereof. Background technique [0002] Neodymium iron boron (Nd-Fe-B) permanent magnet material is currently the most magnetic and widely used magnetic functional material. After more than 30 years of development since its discovery in 1984, Nd-Fe-B permanent magnets are widely used in hybrid vehicles and Wind turbines, etc., have become indispensable important functional materials for high-tech industries. At the same time, Nd-Fe-B permanent magnets are also the materials that consume the most rare earths, and the annual consumption of rare earths is close to half of the total amount of rare earths used in my country. In recent years, the downstream industry's demand for Nd-Fe-B permanent magnets has grown by leaps and bounds. Nd-Fe-B magnets are highly dependent on...

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Problems solved by technology

Since the particle size of Cu powder is much smaller than the grain size of the main phase, it can be well wrapped around the main phase, greatly increasing the electrode potential of the grain boundary phase of the magnet, and improving the corrosion resistance of the magnet, but the melting point of Cu is higher. (1083°C), higher than the usual sintering temperature of 1065°C, therefore, it is difficult for Cu to fully react with the rare earth-rich phase at the grain boundary, resulting in poor grain boundary bonding

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