Research on higher Sm2Fe17N3 rare earth permanent magnet powder by the optimized reduction- diffusion process
HU Guo- hui1,2, ZHU Dai- man2, GAO Jun- yan1,2, ZHANG Wei- feng1, XIONG Jun2, JIA Li- ying2, WANG Qian2, SUN- Wei1,2, LIU Rong- ming1,2, LI Bing- shan1,2
1. BGRIMM Magnetic Materials & Technology FuyangCo. Ltd. ，Fuyang 236000, Anhui， China 2. National Engineering Research Center for Magnetic Materials，Beijing 102600，China
Abstract：The production of Sm2Fe17 alloy by means of reduction- diffusion(R/D) and the preparation of Sm2Fe17N3 magnetic powders by means of gas- solid reaction have been studied. The ethylenediamine tetraacetic acid aqueous ammonia is used to optimize the washing process. With the aid of the X- ray diffraction (XRD) and scanning electron microscope (SEM), theoretical analysis and experimental investigation on diffusion and nitriding process as well as mechanism of Sm- Fe alloy have been carried out. Through vibrating sample magnetometer（VSM）,hysteresis loop of Sm2Fe17N3 magnetic powder has been analyzed. Magnetic powders are obtained with optimum magnetic properties such as Ms＝133. 43 A·m2/kg, Mr＝122. 46 A·m2/kg, Hci＝795. 2 kA/m, (BH)max=180. 64 kJ/m3.
2017, Vol. 24 
