摘要
用陶瓷工艺制备了Ca系永磁铁氧体,用X射线衍射仪分析样品的物相,用振动样品磁强计、永磁铁氧体测量仪、浮力法等对产品相关磁特性进行了检测,用扫描电子显微镜(SEM)观察样品的断面形貌。实验表明,微量Ba的掺杂促进了Ca系铁氧体片状晶粒的均匀生长,磁性能得到明显改善,矩形比(Hk/HCJ)从89%提高到96%,M*值提高2.6%,达到6 200以上,对Ca_(0.98-x)La_xBa_(0.02)Fe_(10.6-x)Co_xO_(19)(x=0.3),1 300℃保温1 h的预烧料粉碎时添加0.2%的H_3BO_3、0.4%的Si O_2,研磨之后成型,成型坯适当低温长时间的烧结更有利于Ca系永磁铁氧体磁参数的改善,如将其烧结温度控制为1 195℃并保温2 h,可获得B_r为452 m T,H_(CJ)为402 k A/m的Ca永磁铁氧体。
After Ca permanent magnet was prepared by ceramics,the researcher tested the related magnetic properties of the products by a vibrating sample magnetometer,permanent ferrite meter,buoyancy,etc.,in the mean time,analyzed the phase of the samples by X-ray diffraction device and observed the sample fracture surface by a scanning electron microscope（ SEM）. Experimental results show： the Ba-doped trace facilitates the uniform tabular grain growth of ferrite; magnetic properties can be significantly improved; squareness ratio（ Hk/HCJ） increased from 89% to 96%,M＊by 2. 6%,reaching more than 6 200; For Ca_（0. 98- x_La_x Ba_（0. 02）Fe_（10. 6- x）Co_xO_（19）,x =0. 3,when 0. 2% H_3BO_3 and 0. 4% Si O_2 are added into the grinding materials calcined at 1 300 ℃ for 1 h incubation,the suitable temperature sintering time is more conducive to the parameter improvement of the Ca-based permanent magnet. If the sintering temperature is controlled at 1 195 ℃and incubated for 2 h,can obtain Ca permanent magnet with B_r452 m T,H_（CJ）402 k A/m.
出处
《应用化工》
CAS
CSCD
北大核心
2016年第5期893-897,共5页
Applied Chemical Industry
基金
四川省重大科技成果转化科研项目(2013GC010)
关键词
Ca系永磁铁氧体
矩形比
磁性能
固相反应
Ca permanent magnetic ferrite
squareness
magnetic properties
solid phase reaction
