Preparation method for Sm2Fe17Nx rare earth permanent magnet powder

• Main Authors: GAO XUEXU, GUO ZHIMENG, LUO JI, XU EN'EN, CHEN CUNGUANG, HAO JUNJIE
• Format: Patent
• Language: English
• Published: 11.03.2015
• Subjects: BASIC ELECTRIC ELEMENTS; CASTING; ELECTRICITY; INDUCTANCES; MAGNETS; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; PERFORMING OPERATIONS; POWDER METALLURGY; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS; TRANSPORTING; WORKING METALLIC POWDER

The invention belongs to the technical field of rare earth permanent magnet materials and discloses a preparation method for Sm2Fe17Nx rare earth permanent magnet powder. According to the preparation method for the Sm2Fe17Nx rare earth permanent magnet powder, the Sm2Fe17Nx rare earth permanent magnet powder is prepared by mechanical alloying, iron powder or ferric oxide powder serves as raw materials, high-pure nitrogen, ammonia gas or decomposed ammonia serves as a nitrogen source, and the atmosphere pressure is from 0.01 to 0.1MPa; microwaves are served as heat sources, the frequency is 2.45GHz, the power is from 1 to 5KW, the resultant temperature is from 500 to 800 DEG C, the heat preservation time is from 2 to 5h, iron nitride powder is synthesized, and the nitrogen content is from 3 wt.% to 8 wt.%. The preparation method for the Sm2Fe17Nx rare earth permanent magnet powder comprises the following steps of mixing pure samarium powder and the prepared iron nitride powder according to a Sm and Fe molar ratio of 2 to 17, and putting the pure samarium powder, the prepared iron nitride powder and aluminum oxide or zirconia ceramic balls into a high-energy ball milling pot after primary mixing, wherein a ratio of grinding media to material is from 10 to 1 to 20 to 1, the ball milling time is from 5 to 10h, and the ball milling medium is high-pure nitrogen; preparing powder in a vacuum glove box. thus obtaining the Sm2Fe17Nx rare earth permanent magnet powder. The preparation method for the Sm2Fe17Nx rare earth permanent magnet powder is simple in technology, low in cost and easy for industrialization, and high-performance Sm2Fe17Nx rare earth permanent magnet powder with different nitrogen contents can be efficiently synthesized according to requirements.