李磊,李燊昊,张梦成,刘家琴,刘友好,衣晓飞,吴玉程

• 1:合肥工业大学工业与装备技术研究院航空结构件成形制造与装备安徽省重点实验室
• 2:安徽省先进复合材料设计与应用工程研究中心
• 3:稀土永磁材料国家重点实验室

摘要(Abstract)：

采用晶间掺杂法，将纳米Al、Cu_(65)Ga_(35)与钕铁硼磁粉进行混合制备了烧结Nd-Fe-B磁体，研究了纳米Al及Cu_(65)Ga_(35)共掺杂对Nd-Fe-B磁体的磁性能、温度稳定性和微观结构的影响。结果表明：纳米Al与Cu_(65)Ga_(35)共掺杂有助于改善烧结Nd-Fe-B磁体的主相和富稀土相之间的浸润性，优化晶界富稀土相的分布，提高磁体的矫顽力，并改善磁体的温度稳定性。0.2 mass%纳米Al与0.1 mass%Cu_(65)Ga_(35)共掺杂制备的磁体具有最高的矫顽力，矫顽力由11.35 kOe提高到15.08 kOe,继续增加Cu_(65)Ga_(35)添加量会使磁体密度降低、孔洞增多，不利于矫顽力的提高。相较于未掺杂磁体，在20～100℃内，0.2 mass%纳米Al与0.1 mass%Cu_(65)Ga_(35)共掺杂的磁体剩磁温度系数由-0.115%/℃提高到-0.107%/℃,矫顽力温度系数由-0.736%/℃提高到-0.726%/℃,此外经过140℃保温2 h后，磁体的磁通不可逆损失由60.37%降低到39.98%。表明纳米Al及Cu_(65)Ga_(35)共掺杂可以减小磁体的磁通不可逆损失，改善磁体的热稳定性，有利于磁体在高温环境中的应用。

关键词(KeyWords)： 烧结钕铁硼;纳米Al;Cu_(65)Ga_(35);晶间掺杂;矫顽力;热稳定性

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2019YFF0217201);; 安徽省科技重大专项(18030901098);; 安徽省重点研发计划项目(202004b11020024,202104a05020019)

作者(Author): 李磊,李燊昊,张梦成,刘家琴,刘友好,衣晓飞,吴玉程

DOI: 10.13289/j.issn.1009-6264.2021-0540

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