永磁铁氧体粉体六价铬控制  

Control technology of Cr^6+in permanent magnet ferrite powder

作　　者：王倩[1,2] 李炳山 贾立颖[1] 刘荣明 胡国辉 刘辉[1,2] 王永齐 周超 WANG Qian;LI Bing-shan;JIA Li-ying;LIU Rong-ming;HU Guo-hui;LIU Hui;WANG Yong-qi;ZHOU Chao(National Engineering Research Center for Magnetic Materials,Beijing 102600,China;BGRIMM Magnetic Materials&Technology(Fuyang)Co,Ltd,Fuyang 236000,China)

机构地区：[1]国家磁性材料工程技术研究中心,北京102600 [2]北矿磁材(阜阳)有限公司,安徽阜阳236000

出　　处：《磁性材料及器件》2020年第5期55-57,64,共4页Journal of Magnetic Materials and Devices

基　　金：北京矿冶研究总院科研基金重大类资助项目(YJZ-2015-03)。

摘　　要：采用低氧化锶含量的高摩尔比配方体系及干燥窑尾气辅助加热的烘干方式,可有效消减产品中Cr^(6+)含量,使产品中Cr^(6+)含量<10ppm。当氧化铁与氧化锶的摩尔比为6.2时,产品的综合性能最优:Cr^(6+)含量为8ppm,剩磁Br为261m T,内禀矫顽力Hcj为311kA/m。干燥窑尾气辅助加热的烘干方式,可使产品中Cr^(6+)的含量稳定在7~8 ppm,并使物料的料面温度保持在300℃以下,减少烘干能耗50%。Cr6+content in permanent magnetic ferrite powder can be effectively reduced by using formula system with high molar ratio of ferric oxide to strontium oxide and low strontium oxide content and drying method with auxiliary heating of exhaust gas from drying kiln.The Cr6+content in the product is less than 10 ppm.When the molar ratio of ferric oxide to strontium oxide is 6.2,the product has the best comprehensive performance:Cr6+content of 8 ppm,Br=261 mT,and Hcj=311 kA/m.The drying method of exhaust assisted heating in the drying kiln can stabilize the Cr6+content in the product at 7 to 8 ppm.And temperature of the material surface is kept at below 300℃,and energy consumption for drying is decreased by about 50%.

关 键 词：永磁铁氧体 六价铬控制 氧化铁与氧化锶摩尔比 干燥窑尾气辅助加热 

分 类 号：TM273[一般工业技术—材料科学与工程]