原子与分子物理学报2011，Vol.28Issue(5)：953-958,6.DOI:10.3969/j.issn.1000-0364.2011.05.029
晶粒间界相及结构缺陷对HDDR粘结磁体矫顽力的影响
Dependence of coercivity on the intergranular phase and structure defect for HDDR bonded magnet
摘要
Abstract
According to the microstructure of HDDR (hydrogenation, disproportionation, desorption and recombination) Nd -Fe~B magnetic powders grains, the model of double continuous variations was proposed for the anisotropy constant K\ and the exchange integral A\ in defect region. The dependence of coericivity of magnet on the intergranular phase thickness d and the structure defect thickness rB was studied. The results showed that the coercivity, Hc, increases as d increases when the thickness r<,> the anisotropy constant K, (0) at the grain surface and the exchange integral constant A\ (0) take different values. When Ki (0) and Ai (0) are fixed, Hc enhances as r0increases for the same d. On the contrary, for the fixed r0 and d, He decreases with increasing K, (0) or A] (0). The calculated coercivity is in good agreement with experimental results given by others when d takes lnm, r0 is in the rang of (2~5) nm, Ai (0) and K, (0) change in the range of (0. 6~0. 7) of A, and K\, respectively.关键词
粘结磁体/双变量模型/微结构/矫顽力Key words
bonded magnet, double variation model, microstructure, coercivity分类
数理科学引用本文复制引用
刘敏,古爱琼,高汝伟..晶粒间界相及结构缺陷对HDDR粘结磁体矫顽力的影响[J].原子与分子物理学报,2011,28(5):953-958,6.基金项目
惠州学院博士科研启动项目(C510.0205) （C510.0205）
