摘要
氢破碎工艺作为烧结钕铁硼永磁体制作过程中铸锭粗破碎的新工艺,具有使主相破碎成单晶的独特优点。为了优化氢破碎工艺,主要研究了铸锭表面积、温度和钕含量对钕铁硼铸锭发生破碎的吸氢孕育期、平均吸氢量和吸氢速度的影响。结果发现,表面积增大,吸氢孕育期缩短。温度提高,孕育期缩短,吸氢速度加快,平均吸氢量稍有变化,这主要是因为温度的提高,增加氢扩散速度所致。而提高钕含量,孕育期同样缩短,吸氢速度加快,平均吸氢量增大,这与富钕相的增多有关。并且,可以通过吸氢量来计算铸锭中富钕相的含量。
The technical parameters of HD process were studied, as well as the effects of temperature and neodymium contents on the incubation period of hydrogen absorption, hydrogen concentration and the rate of hydrogen absorbed. The results show that the incubation period is shortened and the rate of hydrogen absorbed is speeded, when temperature rises, as well as surface area. These are attributed to the rising rate of hydrogen diffusing at higher temperature. The changes of the incubation period and the rate of hydrogen absorbed have the similar trend resulted from the increase of the content of the Nd-rich phase to that resulted from temperature rising. Moreover, the percent of the Nd-rich phase in the ingot can be calculated according to the total hydrogen weight gain.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2004年第1期99-103,共5页
Journal of the Chinese Society of Rare Earths
基金
湖南省自然科学基金资助项目(00JJY2042)
关键词
金属材料
氢破碎
表面积
钕含量
钕铁硼
稀土
metal materials
hydrogen decrepitation
neodymium content
surface area
NdFeB
rare earths
