Ga对HDDR磁粉热变形磁体磁性能和微观结构的影响  

Effects of Ga additions on magnetic performance and microstructure of die-upset magnets

作　　者：赖彬[1] 王会杰[1] 赵睿[1] 张文臣[1] 潘伟[1] 

机构地区：[1]钢铁研究总院功能材料研究所,北京100081

出　　处：《功能材料》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)

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.

关 键 词：HDDR工艺 热压/热变形 微观结构 各向异性 

分 类 号：TM237[一般工业技术—材料科学与工程]