Ca^(2+)的添加对粘结铁氧体磁粉性能的影响  

EFFECT OF Ca^(2+) ADDITION ON PROPERTY OF BARIUM FERRITE POWDER FOR BONDED MAGNET

作　　者：林毅[1] 吕宝顺[1] 要继忠[1] 

机构地区：[1]北京矿冶研究总院磁性材料研究所

出　　处：《北京矿冶研究总院学报》1992年第1期84-88,共5页

摘　　要：研究了在用铁鳞为原料制备钡铁氧体粘结磁粉过程中,Ca^(2+)的添加对预烧时晶粒生长的作用和对所制磁粉的压制取向性的影响。并对添加1.2wt％的CaCO_3和未添加CaCO_3的这两种预烧料所制磁粉在压制或挤出时,受应力作用其易磁化轴的取向程度进行了比较。结果表明,在预烧时添加CaCO_3能够促使M相晶粒向片状化生长;用此预烧料所制磁粉具有明显的压制取向性;用此磁粉挤出的磁胶条磁性能可达:Br=0.1954T,bHc=120 kA/m,(B H)_(max)=5.87kJ/m^3。In the course of preparation of barium ferrite powder for making flexible magnet using mill scale, the effect of Ca2+ addition on grain growth during the presintering and crystal orientation of magnetic powder in press has been studied. It was compared with the crystal orientation magnitude of two kinds of powder under the stress in the course of pressing or extruding, which were made from presintering materials with additive of 1.2% CaCO3 and no additive respectively. The ratio Mr/Ms was regarded as a parameter of measuring orientation magnitude of powder during sample preparation. The experimental results indicated that barium ferrite in presintering with additive of CaCO3 showed the tendency to grow plate-like crystal grain. The test data indicated that the value of Mr/Ms of magnetic strip using the powder made from the presintering material with 1.2% CaCO3 was around 0.71 to 0.77. The other one without additive was about 0.63 to 0.64. The best magnetic properties of strip showed as follows:

关 键 词：钡铁氧体 磁粉 铁鳞 压制定向 钙离子 晶粒生长 粘结磁体 

分 类 号：TM277[一般工业技术—材料科学与工程]