复相铁氧体材料的放电等离子体烧结合成  

Composite hexaferrite synthesized by spark plasma sintering method

作　　者：吴晓艳[1] 赵文俞[1] 魏平[1] 张清杰[1] 

机构地区：[1]武汉理工大学材料复合新技术国家重点实验室,湖北武汉430070

出　　处：《功能材料》2009年第9期1461-1464,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50572083)

摘　　要：采用化学共沉淀法制备了名义组成为xFe+BaFe12O19(0≤x≤1,Δx=0.2)的共沉淀前驱体,研究了该前驱体在放电等离子体烧结条件下形成复相铁氧体材料的结晶行为和烧结体的磁性能。结果表明,所有烧结体中均没有Fe2O3中间相形成,x=0时烧结体为单相M型钡铁氧体(BaM),0<x<0.8时烧结体由BaM、Fe3O4和Ba2Fe14O22(Fe2Y)组成,0.8≤x≤1.0时烧结体由Fe3O4和Fe2Y组成。烧结体中BaM含量随x增加而逐渐降低,Fe3O4和Fe2Y含量逐渐增加,针状Fe2Y主要分布在Fe3O4和BaM之间的界面区,不存在BaM的烧结体中Fe2Y与Fe3O4呈随机分布。饱和磁化强度随x增加先显著降低后几乎不变,最后显著降低再稍增大,这与烧结体的物相组成演变规律相吻合。矫顽力先大幅度降低后略增大,与Fe3O4和Fe2Y含量增多、BaM含量减少和Fe3O4与Fe2Y晶粒长大有关。The coprecipitation precursors with nominal composition of xFe ＋ BaFe12O19 （0≤x≤ 1, △x = 0.2） were prepared by chemical coprecipitation process. The crystallization behavior of the precursor under the spark plasma sintering （SPS） conditions and the magnetic properties of the SPS samples were investigated. The results show that the crystallization of intermediate such as Fe2O3 did not occur in all the SPS samples. The SPS samples for 0〈x〈0.8 were composed of M-type barium hexaferrite （BaM）, Fe3O4 and Ba2Fe14O22 （Fe2Y） and for 0.8≤x≤1. 0 were composed of Fe3O4 and Fe2Y, though the SPS sample for x=0 was composed of single-phase BaM. BaM gradually reduced and Fe3O4 and Fe2 Y gradually increased as the x increased. Needle Fe2Y mainly occurred in the interface area between Fe3O4 and BaM. However, Fe2Y and Fe3O4 are randomly distributed in these samples without BaM. The saturation magnetization first reduced significantly and remained almost con- stant, finally remarkably decreased again and then slightly increased. This accorded with the evolution characteristics of the phase composition of the SPS samples with the increase of x. The coercivity first increased significantly and then decreased slightly with the increase of x, which was attributed to the corresponding increases in the content of Fe3O4 and Fe2 Y, the reduction in the content of BaM, and the growth of Fe3 O4 and Fe2 Y.

关 键 词：复相铁氧体 放电等离子体烧结 结晶反应机理:磁性能 

分 类 号：TM277[一般工业技术—材料科学与工程]