CAJ | 학술논문

采用陶瓷法制备La0.6Ca0.4－xBaxO·n/2(Fe1－yCoy)2O3永磁铁氧体材料。用X射线衍射(XRD)、扫描电子显微镜(SEM)、振动样品磁强计（VSM）和测磁仪对样品的晶体结构、显微形貌与磁学性能进行表征。当x=0时，预烧料样品为单一的M相，晶粒为明显的片状，磁体性能：Br=440mT，Hcb=296kA/m，Hcj=426kA/m，(BH)max=36.6kJ/m3，Hk/Hcj=0.83。钡元素取代钙元素后，预烧料样品仍为单一的 M 相，晶粒的三维尺寸接近，磁体矩形度Hk/Hcj提高。当x=0.1时，矩形比最高，达到0.93。通过工艺的调整，获得了优异的磁性能：Br=445mT， Hcb=337kA/m，Hcj=420kA/m，(BH)max=38.6kJ/m3，Hk/Hcj=0.95。
채용도자법제비La0.6Ca0.4－xBaxO·n/2(Fe1－yCoy)2O3영자철양체재료。용X사선연사(XRD)、소묘전자현미경(SEM)、진동양품자강계（VSM）화측자의대양품적정체결구、현미형모여자학성능진행표정。당x=0시，예소료양품위단일적M상，정립위명현적편상，자체성능：Br=440mT，Hcb=296kA/m，Hcj=426kA/m，(BH)max=36.6kJ/m3，Hk/Hcj=0.83。패원소취대개원소후，예소료양품잉위단일적 M 상，정립적삼유척촌접근，자체구형도Hk/Hcj제고。당x=0.1시，구형비최고，체도0.93。통과공예적조정，획득료우이적자성능：Br=445mT， Hcb=337kA/m，Hcj=420kA/m，(BH)max=38.6kJ/m3，Hk/Hcj=0.95。
La0.6Ca0.4-xBaxO·n/2 (Fe1-yCoy)2O3 permanent ferrite materials were prepared by ceramic technique. The topography and structure were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The magnetic properties were measured using vibrating sample magnetometer (VSM) and digital magnetometer. Single M-phase and flake-like grains were obtained for sample without Ba substitution(x=0), and the magnetic properties of the pre-sintering La-Ca-Co ferrite were as follows:Br=440 mT,Hcb=296 kA/m,Hcj=426 kA/m, (BH)max=36.6 kJ/m3 and Hk/Hcj=0.83. When Ca element was substituted by Ba, pre-sintering powder presents single M-phase structure and close three-dimensional size of grains, resulting in an improved rectangle ratio of sintered magnet. The rectangle ratio of sintered magnet reaches a maximum of 0.93 for sample ofx=0.1. By optimizing process parameters, M-type La-Ca-Ba-Co sintered magnet was prepared withBr=445 mT,Hcb=337 kA/m,Hcj=420 kA/m, (BH)max = 38.6 kJ/m3 and Hk/Hcj=0.95.