NdFe12永磁材料中的相转变研究

Phase transition in NdFe12 permanent magnet materials

摘要:

Nd-Fe系稀土过渡族化合物包含有很多种不同的类型,其中大部分化合物的结构可以在一定条件下相互转化。在稀土永磁材料制备过程中存在的各相之间的转变对永磁材料磁性能有很大的影响。然而之前的研究对Nd-Fe系化合物中相变过程的分析较少,本文制备了NdFe₁₂铸锭并使用EDS能谱分析了冷却过程中铸锭中的相变过程,同时使用熔体快淬法制备了前驱体的薄带,通过X射线衍射分析了薄带中相的组成。研究发现铸锭与薄带中的相组成均受冷却速度的影响。控制NdFe₁₂系化合物中相组成及相变过程对之后制备NdFe₁₂N_x低稀土新一代永磁材料具有很重要的意义。

Abstract:

Nd-Fe-based rare earth transition compounds are composed of many different types, and most of the structures of the compounds can be converted into each other under certain conditions. The transition between the phases existing in the preparation of the rare earth permanent magnet material has a great influence on the magnetic properties of the permanent magnet material. However, the previous studies have less analysis of the phase transition process in Nd-Fe compounds. In this paper, NdFe₁₂ ingots were prepared and EDS spectra were used to analyze the phase transformation process in the ingot during cooling, and the melt quenching method was used. The NdFe₁₂ ribbon was prepared and the composition of the phase in the ribbon was analyzed by X-ray diffraction. It has been found that the phase composition in the ingot and the ribbon is affected by the cooling rate. Controlling the phase composition and phase transformation process of NdFe₁₂ compounds is of great significance for the preparation of NdFe₁₂N_x low rare earth new generation permanent magnet materials.