A rare earth permanent magnet material added with yttrium and its preparation method

Abstract

A rare-earth permanent magnet material added with yttrium and a preparation method thereof, the chemical formula of the material is expressed as (Y x RE 1‑x ) a Fe bal m b N c , where, 0.05≤x≤0.4, 7≤a≤13, 0≤b≤3, 5≤c≤20, the balance is Fe, that is, bal=100‑a‑b‑c; RE is the rare earth element Sm or A combination of rare earth element Sm and any one of Zr, Nd and Pr or more, M is Co and / or Nb, and N is nitrogen. The preparation method uses the rare earth Y element to replace the Sm element of the samarium-iron-nitrogen material, and by regulating the ratio of the Sm element to the Y element, the viscosity of the alloy liquid can be reduced, the amorphous forming ability of the material can be enhanced, and the magnetic properties can be improved. The disadvantages of high coercive force and low residual magnetism are improved, and the magnetic properties of the prepared magnetic powder are more suitable for the performance requirements of motor manufacturing for magnets, filling the gap in the performance of magnets for motor applications.

Description

technical field [0001] The invention relates to the field of rare earth permanent magnet materials, in particular to a rare earth permanent magnet material added with yttrium and a preparation method thereof. Background technique [0002] Since the discovery of NdFeB rare earth permanent magnet materials, it has been widely used in electronic products, medical equipment, automobile industry, energy transportation and other fields due to its superior comprehensive magnetic properties, and with the production and consumption of NdFeB The amount of metal neodymium and dysprosium used as raw materials is increasing year by year, and the consumption rate of metal neodymium and common additive metal dysprosium is also getting faster and faster, resulting in an increase in the cost of materials; on the other hand, with the further promotion and application of permanent magnet motors in the fields of electric vehicles and smart home appliances, The demand for permanent magnet motors...

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Problems solved by technology

[0002] Since the discovery of NdFeB rare earth permanent magnet materials, it has been widely used in electronic products, medical equipment, automobile industry, energy transportation and other fields due to its superior comprehensive magnetic properties, and with the production and consumption of NdFeB The amount of metal neodymium and dysprosium used as raw materials is increasing year by year, and the consumption rate of metal neodymium and common additive metal dysprosium is also getting faster and faster, resulting in an increase in the cost of materials; on the other hand, with the further promotion and application of permanent magnet motors in the fields of electric vehicles and smart home appliances, The demand for permanent magnet motors in the motor market is increasing, so the search for magnetic materials to replace NdFeB has been put on the agenda

[0003] At present, the Fe site is mainly replaced by the addition of the third element Ti, Nb, Al, and Si to stabilize TbCu. 7 type metastable phase, reducing the wheel speed, but the addition of a certain amount of the above elements will reduce the saturation magnetization of the alloy; and the rare earth Y element with a smaller atomic radius can play a role in stabilizing the metastable phase, and the magnetic pole The chemical strength is basically unchanged

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