摘要
利用HDDR工艺制备出Nd32FebalBGax(x=0.0、0.2%、0.4%、0.6%、0.8%(质量分数))磁粉,并且对HDDR磁粉进行热压/热变形处理制备出全密度各向异性磁体。研究了热变形温度和Ga含量对Nd-Fe-B热变形磁体磁性能的影响,观测了不同Ga含量热变形磁体的微观结构,探讨了微量元素Ga的添加对用HDDR磁粉制备的热变形磁体微观结构和磁性能的影响机制。研究发现,Ga的添加能够明显减小热变形磁体的主相晶粒尺寸,改善磁体的微观织构,并可以同时提高热变形磁体的剩磁和矫顽力。当Ga含量为0.6%(质量分数)时,热变形磁体的磁能积达到最大值228.3kJ/m3。
Full-dense anisotropic magnets are produced from isotropic Nd32FebalBGax （x=0.0,0.2%,0.4%,0.6%,0.8wt%） magnetic powders by hot pressing and subsequent die-upset.Magnetic performance of die-upset magnets with various die-upset temperature and different Ga contents is measured by hysteresis loop tracer.Microstructure of the latter is investigated by scanning electron microscopy （SEM）.The effects of Ga additions on microstructure and magnetic performance of die-upset magnets is discussed.It is found that increased Ga content will refine grains and improve magnetic microstructure.With increasing Ga additions,remanence Br and coercive force Hcj could be both enhanced.When Ga reaches 0.6wt%,the maximum energy product （BH）max of die-upset magnets reach up to 228.3kJ/m^3.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2010年第4期591-593,597,共4页
Journal of Functional Materials
基金
国家自然科学基金资助项目(50801014
50771035)
国家高技术研究发展计划(863计划)资助项目(2007AA03Z400
2007AA03Z100)
作者简介
籁彬（1984-），男，四川眉山人,在读硕士，师承潘伟教授，从事热变形Nd—Fe—B材料的研究。
通讯作者：潘伟
