摘要
将组成分别为 Nd3.5Dy30 .0 Fe6 5.5Nb0 .4 B1 .1 和 Nd33.5Fe30 .5Co35.0 Nb0 .4 B1 .1 (质量百分数 )的铸态 Nd- Fe- B合金按比例进行混合 ,使合金中的 (Dy+Co)总量基本保持不变 ,让 Dy和 Co的相对含量发生变化 ,采用粉末冶金工艺生产Nd- Fe- B磁体。结果发现 :磁体的 Br随着含 Co合金比例的增加线性增大 ,i H c随着含 Co合金比例的增加线性减小 ,但磁体的磁通可逆温度系数却只在较小的范围内变化。这说明当 (Dy+Co)含量保持在一定范围内时 ,既可以通过增加 Dy含量降低磁体的温度系数也可以通过增加 Co含量降低磁体的温度系数。在此研究的基础上 ,通过调整初始合金的成分和工艺 ,制成了磁性能为 18MGOe/2 3k Oe～ 2 5 MGOe/15 k Oe、磁通可逆温度系数为 - 0 .0 18% /℃～ -0 .0 2 6 % /℃的高稳定性、低温度系数 Nd- Fe-
Sintered anisotropic Nd-Fe-B magnets with low temperature coefficient were prepared by binary alloy blending method (BABM). As-cast Nd3.5Dy30.0Fe65.5Nd33.5B1.1 (mass fraction) and Nd33.5Fe30.5Co35.0Nb0.4B1.1 (mass fraction) pre-alloys were produced separately. The above two kinds of alloys were mixed in a proportion to keep the total content of Dy and Cc nearly constant, but the Dy/Co ratio varied in the different proportion of two kinds of alloys. It was found, under such a condition, B-r increased almost linearly, but iHc decreased linearly, with increasing Co-containing alloy, the variation of the reversible temperature coefficient of the magnetic flux of the magnets was not apparent. It means, when the total content of Dy and Cc keeps constant, the temperature coefficient of the magnet can be decreased by increasing Dy content or increasing Co content. However, the ratio of Dy/Co should be balanced when considering the coercivity iHc of the magnets. The magnets with low temperature coefficient were prepared, their magnetic property parameters are as follows: (BH)(max)=18MGOe/23kOesimilar to25MGOe/15kOe, alpha=-0.18%/degreesCsimilar to0.026%/degreesC.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2002年第1期52-55,共4页
Rare Metal Materials and Engineering
关键词
温度系数
混合合金法
永磁材料
钕铁硼
Nd-Fe-B
Nd-Dy-Fe-Co-B
temperature coefficient
binary alloy blending method
