轻稀土RE-Ni-Fe体系相图及相关合金微波吸收机理研究

近年来，随着S(2-4GHz)波段各类电子产品的广泛使用，使在该频段具有高吸收率的吸波材料已成为迫切需要。但是，由于受到材料结构、成分、制备工艺条件等制约，目前研制出的材料在S波段的吸波性能仍不理想。为了解决这个问题，项目将通过测定轻稀土RE(RE=Ce,Pr,Nd,Sm)-Ni-Fe等体系相图，确定相关系和各单相固溶度；以测定相图为依据，采用XRD、SEM、AFM等手段研究Ni-Fe基合金的晶体结构、晶胞参数、原子占位、相关系、磁结构等因素随RE、Mn、Co、Si、Al等元素添加而变化的规律，研究这些因素与吸波性能之间的关系及作用机理，找出在S波段具有优异吸波性能的先进吸波材料；探索合金微粉的相结构、晶粒尺寸、颗粒形貌、微波吸收性能等随球磨时间、热处理温度和时间、磁场热处理等制备工艺条件变化规律，寻找微波吸收性能与制备工艺条件之间的关系，获得制备综合微波吸收性能优异的最佳工艺条件。

In recent years, along with the wide use of electronic products in S-band (2-4GHz), finding the absorbing material with a high absorption rate in the band has become an urgent need. However, due to the restricting of material structure, composition, and preparation conditions, the microwave absorbing properties of the developed material in S-band is still not satisfactory. To solve this problem, the project will investigate the phase diagrams of light rare earth RE (RE = Ce,Pr,Nd,Sm)-Ni-Fe system, determine the correlation coefficient and the single-phase solid solution. Then on the base of the studied phase diagram, we will analyze the influence of elements addition such as RE, Mn, Co, Si, Al, etc. on crystal structure, lattice parameters, atomic placeholder, phase relationship and magnetic structure of the Ni-Fe-based alloys by means of XRD, SEM, NPD, AFM techniques, study the mechanism between these factors and the absorbing properties to find out new excellent absorbing materials in S-band. Further we will explore the phase structure, grain size, particle morphology, microwave absorption performance of the alloy powders changing with the preparation conditions such as the milling time, the heat treatment temperature and time, magnetic heat treatment, etc. to find out the relationship between the microwave absorption properties and the preparation conditions, and obtain the optimum preparation conditions of integrated microwave absorbing performance.