液相烧结对Nd-Fe-B粉末压坯及磁体取向度的影响  

Influence of Liquid Sintering on Alignment Degree of Nd-Fe- B Green Compact and Magnets

作　　者：何叶青 王震西 周寿增[2] 张臻蓉[3] 韩宝善[3] 

机构地区：[1]北京中科三环高科技股份有限公司,北京100080 [2]北京科技大学新金属材料国家重点实验室,北京100083 [3]中国科学院凝聚态物理中心国家磁学实验室,北京100080

出　　处：《中国稀土学报》2003年第4期367-370,共4页Journal of the Chinese Society of Rare Earths

基　　金：国家自然基金委资助项目(10074081和10074005)

摘　　要：XRD,SEM及MFM观察表明,Nd Fe B粉末压坯在液相烧结过程中同时存在两种影响主相晶粒取向度的机制:烧结过程中大颗粒吞并吸附在其表面的取向不良的小晶粒并择优长大,使磁体的取向度提高;在液相烧结过程中,被液相所包围的主相晶粒的自由转动,造成磁体的取向度降低。对于取向度较低的DP生坯,烧结中影响Nd Fe B磁体取向度的前一种机制是主导的;而对于取向度较高的振动RIP生坯,烧结过程中后一种机制起主导作用。There exist two mechanisms to affect the alignment degree of the main phase grai ns of Nd-Fe-B green compact during liquid phase sintering. Large grains annex fine grains, which makes the alignment degree better. Rotation of the grains sur rounded by Nd-rich phase in liquid state makes the alignment degree worse. For DP green compact with relatively lower alignment degree, the first mechanism is dominant during sintering. While for RIP green compact with relatively higher al ignment degree, the latter mechanism is dominant. These two mechanisms were obse rved and confirmed by XRD, SEM and MFM.

关 键 词：凝聚态物理 烧结ND-FE-B 压坯 X射线 取向度 磁力显微镜 稀土 

分 类 号：TG132.272[一般工业技术—材料科学与工程]