铜业工程Issue(1)：90-96,7.DOI:10.3969/j.issn.1009-3842.2026.01.008
Tb-Al-Cu/Nd复合扩散源对烧结钕铁硼磁性能的影响
Effect of Composite Diffusion Sources on Magnetic Properties of Sintered NdFeB Magnets
摘要
Abstract
Grain boundary diffusion technology has emerged as a pivotal approach to overcome bottlenecks of high cost and significant remanence loss in traditional single-alloy methods by precisely regulating the distribution of heavy rare earths(HREs),thereby markedly enhancing the coercivity of NdFeB magnets.This study proposed composite diffusion sources formed by blending Tb-Al-Cu HRE alloys with pure Nd powder at varying ratios,systematically investigating their diffusion modification effects on both HRE-free and HRE-containing substrates.Experimental results demonstrated that under optimal diffusion source ratios,the maximum coercivity enhancements for the two substrates reached 1.036 T and 0.959 T,respectively,with remanence attenuation controlled within 0.59 kGs and 0.43 kGs.When TbAlCu-to-pure-Nd ratio was 3∶2(for HRE-free substrates)or 2∶3(for HRE-containing substrates),the magnets exhibited optimal comprehensive performance,achieving 48UH and 45EH grade levels,respectively.Microstructural analysis revealed that HRE-free substrates developed increased grain boundary phases,refined grains,and core-shell structures after diffusion,while HRE-containing substrates showed a significant increase in non-magnetic grain boundary phases.By designing composite diffusion sources,this study achieved remarkable magnetic performance improvements with low HRE consumption,offering a novel strategy for the green preparation and resource-efficient utilization of high-performance NdFeB magnets.关键词
烧结钕铁硼/晶界扩散/复合扩散源/低重稀土/磁性能Key words
sintered NdFeB/grain boundary diffusion/composite diffusion source/low heavy rare earth/magnetic property分类
信息技术与安全科学引用本文复制引用
刘宏雄,王志恒,刘延丰,曹俊,刘乔波,黄强,杨金金,陈奕欣..Tb-Al-Cu/Nd复合扩散源对烧结钕铁硼磁性能的影响[J].铜业工程,2026,(1):90-96,7.基金项目
国家重点研发专项(2023YFB3507501) （2023YFB3507501）
赣鄱俊才支持计划项目(20232BCJ23056)资助 （20232BCJ23056）
