高居里温度Nd-Fe-B磁体的制备及温度稳定性研究  

Preparation and research on temperature stability of Nd-Fe-B magnets with high Curie temperature

作　　者：李栋 董生智[1] 徐吉元 LI Dong;DONG Shengzhi;XU Jiyuan(Research Institute of Functional Materials,Central Iron and Steel Research Institute,Beijing 100081)

机构地区：[1]钢铁研究总院功能材料研究所,北京100081

出　　处：《粉末冶金工业》2021年第3期25-31,共7页Powder Metallurgy Industry

基　　金：国家自然科学基金重大项目资助(51590882)。

摘　　要：本文通过研究磁体(PrNd)_(27.8)Co_(x)Dy_(3)Fe_(bal)B_(0.97)(x=20,25)在不同热处理工艺下的磁性能、密度及晶粒大小,以探寻其最佳热处理工艺,并对磁体的温度稳定性进行了研究。结果表明:较高的Co含量使磁体的居里温度T_(c)大幅提高,但会导致内禀矫顽力H_(cj)下降;磁体的温度稳定性(温度系数与不可逆磁通损失h_(irr))不仅取决于居里温度,往往还与矫顽力有关;与商业磁体40M相比,高居里温度磁体的温度系数与不可逆磁通损失hirr有明显改善。In this paper, the magnetic properties, density and grain size of (PrNd)_(27.8)Co_(x)Dy_(3)Fe_(bal)B_(0.97)(x=20,25) magnets were investigated to explore the best heat treatment process, and the corresponding temperature stabilities were compared with commercial magnet 40 M. The experimental results show that high Co content enhances the Curie temperature significantly while the intrinsic coercive force decreases in some extent. The temperature stability(temperature coefficient and irreversible flux loss) not only depend on the Curie temperature, but also are affected by the coercive force. Compared with the commercial magnet 40 M, temperature coefficient and irreversible flux loss of the magnet with high Curie temperature has been significantly improved.

关 键 词：烧结ND-FE-B磁体 烧结与回火温度 居里温度 温度稳定性 

分 类 号：TM273[一般工业技术—材料科学与工程]