论文部分内容阅读
采用SEM和XRD对Nd13Fe81.5B5.5合金氢化-歧化-脱氢过程中相结构和组织形貌的变化进行了观测分析,结果表明:非受热的Nd13Fe81.5B5.5合金的吸氢只能在富钕相的晶界上进行,吸氢的过程伴随着热量的释放。加热后的Nd13Fe81.5B5.5合金吸氢不仅沿着Nd13Fe81.5B5.5富钕相晶界进行,而且也能在其晶格内进行。合金吸氢后生成物主相为NdH2.9和α-Fe,还有微量的Fe2B和Fe2Nd,吸氢的过程伴随着大量热的释放,Nd13Fe81.5B5.5合金的吸氢温度为700℃,在730℃~800℃的范围内脱氢,在此工艺条件下,能获得高质量的氢化物。
The phase structure and microstructure of Nd13Fe81.5B5.5 alloy during hydrogenation-disproportionation-dehydrogenation were observed and analyzed by SEM and XRD. The results showed that the hydrogen absorption of Nd13Fe81.5B5.5 alloy was Nd-rich phase on the grain boundary, hydrogen absorption process accompanied by the release of heat. Hydrogen absorption of the heated Nd13Fe81.5B5.5 alloy proceeds not only along the Nd13Fe81.5B5.5 neodymium-rich grain boundary but also within its lattice. The main phase of the resultant hydrogen-absorbing alloy is NdH2.9 and α-Fe, and traces of Fe2B and Fe2Nd. The process of hydrogen absorption is accompanied by a large amount of heat release. The hydrogen absorption temperature of Nd13Fe81.5B5.5 alloy is 700 ℃, In the range of 730 ℃ ~ 800 ℃ dehydrogenation, under this process conditions, to obtain high quality hydride.