摘要
研究了氢化／歧化／脱氢／重组（简称ＨＤＤＲ）工艺过程中ＮｄＦｅＣｏＺｒＢ合金相组成和磁性能的变化规律。结果表明，经氢化／歧化后合金中除了正常的歧化产物外，还存在少量未分解的Φ相晶粒残核；在脱氢／重组过程中，随着真空中氢气压力ｐｓ的降低，磁粉中重组形成的Φ相的体积分数不断增加，同时粉末粘结磁体的内禀矫顽力线性升高，磁各向异性值在ｐｓ＝６０ｋＰａ处出现最大值。分析表明，ＨＤＤＲ粉末的磁各向异性是通过重组过程中Φ相在残留晶核处的择优形核形成的，但在较低的ｐｓ下Φ相还发生了任意形核，并对ＨＤＤＲ粉末磁各向异性的形成具有不利影响。
Phases and magnetic properties of NdFeCoZrB alloy during the HDDR process were studied. It was found that some residual particles of Φ phase co exist with decomposed products in the disproportionated alloy. During the desorption recombination transformations, the volume fraction of recombined Φ phase is increased with decreasing hydrogen pressure p s in vacuum, and intrinsic coercivity of bonded magnets is linearly increased whereas a maximum anisotropy is determined at p s=60 kPa. The results suggest that a preferred nucleation on the basis of the residual particles of Φ phase be the origin of anisotropy of HDDR received powders, but a random nucleation under lower p s produces negative effect on the development of anisotropy.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
1997年第3期116-119,共4页
The Chinese Journal of Nonferrous Metals
基金
西安交通大学校科学基金
