各向异性Nd2Fe14B/α--Fe纳米晶复合磁体的制备和性能

材料研究学报

2008, Vol. 22

Issue (6): 619-622

研究论文

本期目录 | 过刊浏览

各向异性Nd₂Fe₁₄B/α--Fe纳米晶复合磁体的制备和性能

牛培利;张久兴^†;岳明;李永利

北京工业大学新型功能材料教育部重点实验室北京 100022

Preparation and properties of anisotropic Nd₂Fe₁₄B/α--Fe nanocomposite magnets

NIU Peili; ZHANG Jiuxin^†; YUE Meng; LI Yongli

The Key Laboratory of Advanced Functional Materials; Ministry of Education;
Beijing University of Technology; Beijing 100022

引用本文:

牛培利张久兴岳明李永利. 各向异性Nd₂Fe₁₄B/α--Fe纳米晶复合磁体的制备和性能[J]. 材料研究学报, 2008, 22(6): 619-622.
, , , . Preparation and properties of anisotropic Nd₂Fe₁₄B/α--Fe nanocomposite magnets[J]. Chin J Mater Res, 2008, 22(6): 619-622.

全文: PDF(821 KB)

摘要:

采用声化学法、放电等离子烧结技术(SPS)和热变形工艺制备致密各向同性和各向异性 Nd₂Fe₁₄B/α--Fe复合磁体, 研究了软磁相包覆对磁体的结构和性能的影响.结果表明, 软磁相α--Fe对各向同性Nd₂Fe₁₄B/α--Fe复合磁体的影响主要表现为增强两相间的交换耦合作用, 从而提高剩磁.当α--Fe体积分数的数值适当(不超过2%)时,各向异性 Nd₂Fe₁₄B/α--Fe磁体形成较好的$c$轴晶体织构,具有较高的磁性能. α--Fe体积分数为 1%的磁体性能最高:B_r=1.367 T, H_ci=712 kA/m, (BH)_m=327 kJ/m³.

关键词 ：金属材料, Nd₂Fe₁₄B/α--Fe纳米晶复合磁体, 声化学和放电等离子烧结, 各向异性

Abstract：

Full dense isotropic and anisotropic Nd₂Fe₁₄B/α--Fe nanocomposite magnets were prepared via sonochemistry method, spark plasma sintering (SPS) and hot deformation method. The effects of α–Fe volume fraction on the structure and magnetic properties of the magnets were investigated. For the isotropic magnets, the exchanging coupling and remanence increase as the α–Fe content increases. For the anisotropic magnets, only the magnets with no more than 2% α–Fe exhibit strong c-axis crystal texture of Nd₂Fe₁₄B phase, and the better magnetic properties are B_r=1.367 T, H_ci=712 kA/m, (BH)_m=327 kJ/m³.

Key words： metallic materials nanocomposite magnets Nd₂Fe₁₄B/α--Fe sonochemistry and spark plasma sintering anisotropy

收稿日期: 2007-09-25

ZTFLH:

TM271

基金资助:

国家自然科学基金(50201001);北京市自然科学基金(2041001)

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