摘要
复合添加Cu和Gd以提高烧结Nd(DyAl)FeB磁体的热稳定性和磁性能.Nd(DyAl)FeBGd磁体的可逆温度系数随Gd质量分数的增大而线性降低,热稳定性得到提高,但Gd的加入同时导致磁体剩磁和最大磁能积的下降.Nd(DyAl)FeBGd磁体的剩磁和最大磁能积均随Cu加入量的增加而增大,在Cu质量分数为0.2%时达到最大值,随后Cu的加入将导致剩磁和最大磁能积下降.Nd(DyAl)FeBGd磁体的矫顽力随Cu质量分数的增大而增大,Cu的加入提高了磁体的烧结密度.通过组织成分分析发现,Cu主要分布在磁体主相边界,显著细化了主相晶粒.通过添加Cu和Gd可获得热稳定性高和磁性能优良的NdFeB磁体.
Cu and Gd were added into sintered Nd（DyAl）FeB magnets to improve their thermal stability and magnetic properties. WithGdaddition, the thermal stability was improved, but the remanence and the maximum energy product linearly decreased. As Cu was added, the remanence and the maximum energy product increased, and the optimum values were achieved at Cu fraction of 0.2%. The improved density with Cu addition is one of the reasons for the observed enhancement of remanence. The intrinsic coercivity enhances with the increase of Cu fraction. Microstructure analysis shows that Cu distributes at the grain boundary and dramatically impedes the growth of the main phase. High thermal stability and magnetic properties of NdFeB can be obtained through Cu and Gd addition.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2005年第8期1251-1253,共3页
Journal of Zhejiang University：Engineering Science
基金
浙江省科技厅重点资助项目(2003C21021).
