文章信息/Info

Title:

 Components of Ca Permanent Magnets and their Microstructures and Magnetic Properties

作者:

 王自敏1; 2 鄧志剛2

 （1宜賓職業(yè)技術(shù)學(xué)院，四川 宜賓 644003
2自貢江陽磁材有限責(zé)任公司，四川 自貢643200）

Author(s):

 Wang Zimin 1 ;Deng Zhigang 2

 1.Yibin Vocational and Technical College, Yibin, Sichuan 644003
2.Zigong Joint-Mag Co., Ltd

關(guān)鍵詞:

 ; Ca系永磁鐵氧體; 矩形比; 磁性能; 固相反應(yīng)

DOI:

10.7502/j.issn.1674-3962.2016.09.10

文獻(xiàn)標(biāo)志碼:

A

摘要:

 用陶瓷工藝制備了Ca永磁鐵氧體，用永磁鐵氧體測量儀、振動(dòng)樣品磁強(qiáng)計(jì)、X射線衍射儀型、EDS以及掃描電子顯微鏡等設(shè)備儀器對Ca永磁鐵氧體的物相、磁性能及斷面形貌等進(jìn)行了分析，探討了Ca永磁鐵氧體微觀結(jié)構(gòu)、主、輔配方及取向磁場等對磁性能的影響。實(shí)驗(yàn)表明：微量Ba元素的添加在一定程度上抑制晶粒生長的同時(shí)更有利于Ca鐵氧體晶粒的均勻生長及取向度f的改善，從而明顯改善了產(chǎn)品的磁性能，矩形比（Hk /HCJ）從89%提高到96%，M*值提高2.6%，達(dá)到6200以上；對Ca0.98-xLaxBa0.02Fe10.6-xCoxO19-δ，x=0.3時(shí)的預(yù)燒料細(xì)粉碎時(shí)添加0.2%的H3BO3、0.4%的SiO2，研磨之后的料漿在1150kA/m，即約3倍HCJ的磁場下成型更有利于Ca系永磁鐵氧體磁參數(shù)的改善，Ca永磁鐵氧體產(chǎn)品的典型磁參數(shù)：Br為452mT，HCJ為402kA/m。

Abstract:

The researchers prepared Ca permanent magnets by ceramics. Then they tested the products by the permanent ferrite meters and the vibrating sample magnetometer, etc. and observed the sample fracture surface by X-ray diffraction devices, EDS and SEM (scanning electron microscope).Finally, they analyzed the phase of the samples, magnetic properties and fracture morphology and also discussed the effects on the magnetic properties of the products concerning the microstructure, the main and auxiliary recipe and the orientation of the magnetic field. Experimental results show that the addition of Ba inhabits the grain growth and benefits the uniform grains of Ca ferrite and the orientation f. Hence the magnetic properties are significantly improved. The squareness ratio (Hk/HCJ) increases from 89% to 96%, and M* by 2.6%,reaching more than 6200. For Ca0.98-xLaxBa0.02Fe10.6-xCoxO19-δ，when 0.2% H3BO3 and 0.4% SiO2 ( x=0.3)are added into the grinding materials at1150kA/m, i.e. molded at 3 times HCJ magnetic field, it is more conducive to the parameter improvement of the Ca permanent magnets. The typical parameters of Ca permanent magnets are 452mT for Br and 402kA / m for HCJ.