SmFex alloy and preparation method thereof

Abstract

The invention relates to SmFex alloy and a preparation method thereof. The alloy is composed of, by mass, 20-60% of samarium, 40-80% of iron, less than 0.15% of calcium, less than 0.3% of oxygen, less than 0.02% of aluminum, less than 0.02% of magnesium, less than 0.05% of silicon, less than 0.05% of carbon, less than 0.01% of nitrogen, and less than 0.01% of remaining impurities, wherein the sum of the mass percents of the elements is 100%. Sm2O3 and SmCl3 are used as raw materials, the metal calcium is used as a reducing agent, iron powder is used as an alloying element, and the SmFex intermediate alloy is prepared through the reduction-diffusion method. Compared with the prior art, the SmFex alloy and the preparation method thereof have the advantages that the process is simple, the cost is low, the production efficiency is high, and the content of the samarium in the alloy is stable and controllable.

Description

technical field [0001] The invention relates to a reduction diffusion method for preparing SmFe x Alloy preparation methods, more specifically related to Sm 2 o 3 and SmCl 3 As raw material, metal calcium or CaH 2 As a reducing agent, iron powder is an alloying element, and SmFe is prepared by reduction diffusion method x Alloys and their preparation processes. Background technique [0002] In recent years, with the rapid development of the automobile industry and the miniaturization and weight reduction of electronic appliances, people have put forward higher requirements for the ambient temperature and magnetic properties of permanent magnets. Temperature stability and excellent magnetic properties, and its potential application value have once again attracted the attention of the market, and samarium-iron-nitride permanent magnet materials have also ushered in a new research and development boom. [0003] At present, the research on SmFeN permanent magnet materials ...

AI Technical Summary

Problems solved by technology

However, during the smelting process, because the saturated vapor pressure of Sm is relatively high, and the boiling point is relatively close to the melting point of iron, the loss of samarium during the smelting process is large, and it is necessary to add 10-15wt% pure metal samarium on the basis of the designed alloy ratio. It meets the requirements of samarium content in the component alloy, so it is difficult to accurately control the samarium content in the target alloy, which causes the alloy to form a samarium-rich phase or a soft magnetic phase such as α-Fe during the rapid quenching process, reducing the magnetic properties

In addition, the preparation process of pure metal samarium, the master alloy raw material of samarium iron nitrogen permanent magnet material, is the lanthanum thermal reduction distillation method. This method uses expensive metal lanthanum as the reducing agent, has the disadvantages of long production process, low single furnace output, and high energy consumption. The high cost of samarium metal directly affects the raw material cost of samarium-iron-nitrogen permanent magnet materials and restricts the development of samarium-iron-nitrogen permanent magnet materials industry

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