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添加BaSi_2O_5及BSS助熔剂的Ca永磁铁氧体工艺与磁性

The Technology and Magnetic Properties of Ca Permanent Magnets with the Additives of BaSi_2O_5 and BSS Flux
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摘要 结合BaSi_2O_5及BSS助熔剂的添加技术,在不同料浆粒度、不同成型取向磁场、不同烧结工艺下制备了Ca永磁铁氧体,用压力试验机、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X射线衍射仪分析样品的物相,用扫描电子显微镜观察样品的断面形貌。结果表明:适量BaSi_2O_5与BSS助熔剂的复合掺杂促进了铁氧体晶粒的均匀生长,改善了产品的取向度,从而明显改善了产品的磁性能;对CaLa_(0.5)Fe1_(0.3)Co_(0.3)O_(19-δ)预烧料,细粉碎时添加0.4%的BaSi_2O_5、0.4%的助熔剂BSS,细粉碎平均粒度控制为0.70-0.75μm,成型取向磁场控制为产品HCJ值的3倍(即1245 k A/m),成型坯于1190℃并保温2 h,可获得Br为454 m T、HCJ为415 k A/m,M*为6280以上且承受负荷极限能力良好的永磁铁氧体。 With the additives of BaSi2O5 and BSS flux, Ca permanent magnets were prepared with different technologies, using slurries ofdifferent particle sizes, the magnetic fields of different molding orientations, and different sintering processes. Then the magnetic propertiesof the obtained products were tested by the pressure testing machines, the permanent ferrite meters, and the buoyancy methods. Their samplephases were analyzed by X-ray diffraction, and the cross-section morphologies of the samples were observed by the scanning electronmicroscopes. Experimental results show: the moderate composite addition of BaSi2O5 and BSS flux promotes the uniform growth of the ferritegrains, and ameliorates the orientations, thereby significantly improving the magnetic properties of the products. If 0.4%BaSi2O5 and 0.4%BSSflux are added to sintered Ca0.5La0.5Fe10.3Co0.3O19-δ materials at the time of the fine pulverization; the average particle sizes can be controlled at0.70 - 0.75 μm; the molding orientation of the magnetic field can be controlled at 3 times of HCJ value (i.e. 1245 kA / m); by incubating thegreen bodies for 2 hours at 1190 ℃, permanent magnets can be obtained with an excellent load limit, the Br at 454 mT, the HCJ at 415 kA / m, andM * at 6280.
作者 王自敏 邓志刚 WANG Zimin;DENG Zhigang(Yibin Vocational and Technical College, Yibin 644003, Sichuan, China;Zigong Joint-Mag Magnetic Materials Co., Ltd.,Fushun 643200, Sichuan, China)
出处 《陶瓷学报》 CAS 北大核心 2016年第3期274-278,共5页 Journal of Ceramics
基金 四川省重大科技成果转化项目(2013GC0109)
关键词 Ca永磁铁氧体 助熔剂 磁性能 取向度 Ca permanent magnets flux magnetic properties the degree of orientation
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