有机物复合分散剂对轧制成型粘结铁氧体磁粉分散性及磁体性能的影响  

Effect of organic dispersants on the dispersion of powder and properties of the rolling molded ferrite magnets

作　　者：张威峰 胡国辉 王永齐 魏汉中 贾立颖 王倩[2] 刘荣明 刘辉[1,2] 李柄山 ZHANG Wei-fen1, 2, HU Guo-hui2, XIONG Jun2, WEI Han-zhong1, 2, JIA Li-ying2, WANG Qian2, LIU Rong-ming1, 2, LI Bing-shan1, 2(1. BGRIMM Magnetic Materials ＆ Technology （Fuyang） Co Ltd, Fuyang 236000, China; 2. National Engineering Research Center for Magnetic Materials, Beijing 102600, China)

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

出　　处：《磁性材料及器件》2018年第3期47-49,53,共4页Journal of Magnetic Materials and Devices

基　　金：国家自然科学基金资助项目(51401023);北京矿冶研究总院重大研发计划项目(YJZ-2015-03);北京市丰台区科技三项费项目(KSF201709))

摘　　要：经湿磨及干燥工序后,铁氧体磁粉颗粒被解碎成单畴颗粒,由于液桥力的作用,磁粉产生团聚。采用机械分散和表面改性的方式对粉体进行分散,并分析粉体分散对粉体粒度、形貌及磁性能的影响。实验表明,经振磨分散,磁粉中超细颗粒分散均匀,有利于磁体成型和取向,成型过程中超细颗粒未发生团聚现象。粉体经分散处理后,在轧制成型粘结磁体中的最大含粉量从90.3%提高至93.7%,剩磁从263 m T提高到273 m T。After the wet grinding and drying process, the magnetic ferrite powder of the polycrystal is gradually broken down to single domain one. Due to the liquid bridging force, agglomerations of magnetic powders are easily formed. In this paper, the powders were dispersed by mechanical dispersion and surface modification. The effects of dispersion on the particle sizes, morphologies and magnetic properties were investigated. The results show that the ultrafine powders of the magnetic powder are dispersed uniformly after dispersion by vibration grinding, which is favorable for the formation and orientation of the magnet. Therefore, the ultrafine powders do not agglomerate during the molding process. After dispersing, the maximum content of magnetic powder increases from 90.3 % to 93.7 %, and correspondingly the remanence of the magnet increases from 263 mT to 273 mT in the rolling process.

关 键 词：永磁铁氧体 磁粉 分散 剩磁 

分 类 号：TM277.5[一般工业技术—材料科学与工程]