Nd_2Fe_(14)B等合金吸氢性能研究

STUDY ON THE HYDROGEN ABSORPTION CHARACTERISTICS OF Nd_2Fe_(14)B AND RELEVENT ALLOYS

早在1969年就发现第一代希土永磁材料SmCo_5,每摩尔能够吸2.5摩尔的氢原子。优质吸氢材料LaNi_5在1969年以后才发现的。第三代希土永磁材料Nd-Fe-B合金是否亦具有吸氢性能,磁性和吸氢性能之间是否存在一定的联系,是值得人们去关注的问题。本工作从Nd—Fe—B永磁材料中存在的主要物相着手来研究磁性材料的吸氢性能。

The new Nd-Fe-B type permanent magnetic materials contain usually Nd2Fe14B (as the main phase, hard magnetic phase), boron-rich phase.and neodymiun-rich phase as well. In this paper, for each of these phases the maximun hydrogen absorption capacity, dynamic isotherms of hydrogen absorption, as well as hydrogen desorption curves were measured and determined. The obtained dynamic isotherms showed that the hydrogen absorption characteristics of the magnetic materials are predominated by Nd2Fe14B. The maximum hydrogen absorption capacity is 6H / mol Nd2Fe14B. We have also determined the hydrogen absorption characteristics of Nd-Fe-B type permanent magnetic materials prepared by reduction diffusion method.