Preparation method of nitrogen-containing rare-earth magnetic powder

Abstract

The invention discloses a nitrogen-containing rare-earth magnetic powder prepared by taking ferrocene, cyclopentadienyl lanthanide, metallic iron and rare earth as the main raw materials. The nitrogen-containing rare-earth magnetic powder comprises the following component of R2Fe17-xMxNy, wherein the R is one or more kinds of 17 kinds of rare earth elements including Sc and Y, the M includes transitional elements except for Fe and is one or more kinds of Al, Ga, In, Si, Ge, Sn, Pb, Mg and Ca, the x is equal to 0 to 5, and the y is equal to 1 to 6; and the preparation method comprises the following steps: working procedure of preparation of the R2Fe17-xMx compound powder; working procedure of nitridation; and working procedure of magnetic powder refining and nitriding.

Description

Technical field [0001] The present invention involves rare earth permanent magnet materials and its preparation technology fields, especially providing a nitrogen -containing rare earth magnetic powder and its preparation methods prepared with Ermao Iron, Maomao rare earth, metal iron and rare earth. Background technique [0002] In 1990, Coey and Sun HONG reported the use of Qi-solid-phase reaction to introduce N atoms into R 2 FE 17 In the compound, successfully synthesize R 2 FE 17 N x Inter -metallic compounds in the gap have aroused great attention from the magnetic world and quickly entered the study climax.R 2 FE 17 After the compound suction, the crystal structure remains unchanged, the single -cell volume expands, and the temperature of the lilies has increased significantly.SM 2 FE 17 N x The temperature of Juli is about 740K, which is more than ND 2 FE 14 B's Curie temperature TC (580K) is about 160K.SM 2 FE 17 N x The room temperature of the opposite sex field H A It ...

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Problems solved by technology

[0006]The above patents on R-Fe-N magnetic powder generally use R and Fe as the main raw materials to prepare R-Fe powder, and then directly nitriding in nitrogen-containing gas to form R-Fe-N magnetic powder, but when the R-Fe alloy powder starts nitriding, there is a phenomenon that the nitrogen content is continuously distributed and uneven, and it is necessary to prolong the nitriding time to promote the uniform nitriding of the magnetic powder.

Nitriding for a long time will cause the R-Fe-N magnetic powder to decompose into RN and α-Fe, resulting in a decrease in the magnetic properties of the R-Fe-N magnetic powder

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