两步烧结法对Ni_(0.1)Mg_(0.1)Cu_(0.3)Zn_(0.5)Fe_2O_4铁氧体结构与性能的影响  

The Influence of Two-step Sintering Process on NiMgCuZn Ferrites' Structure and Magnetic Properties

作　　者：马克南 王治[1] 杨博[1] 谢忠燕[1] 李丽娟[1] 

机构地区：[1]天津大学理学院,天津300072

出　　处：《信息记录材料》2015年第3期58-64,共7页Information Recording Materials

摘　　要：采用溶胶凝胶法制备了Ni0.1Mg0.1Cu0.3Zn0.5Fe2O4铁氧体,在650℃预烧结成铁氧体粉体,并压制成环状样品后,分别用一步烧结(TL=950℃、1050℃)和两步烧结工艺(TH=1050℃;△t=0、15、30、45min;TL=950℃)进行烧结,详细研究了一步烧结、两步烧结对铁氧体结构和性能的影响。发现两步烧结能够改善铁氧体的结构和性能,主要结果如下:(1)在TH=1050℃,△t=30min时的两步烧结过程中得到了所有烧结过程中密度最大且颗粒均匀并含有较少气孔的铁氧体;(2)在TH=1050℃,△t=15min时的两步烧结过程中得到了晶粒非常均匀,晶界良好的铁氧体,使饱和磁化强度较一步烧结提高了10emu/g以上;(3)在一步烧结中随着烧结温度的提高初始磁导率降低;在两步烧结中初始磁导率随着第一步烧结的保温时间△t增加而增加,并且均优于950℃的一步烧结的初始磁导率;(4)分析了两步烧结的作用机理,两步烧结的第1步烧结能够在烧结刚开始时促进坯体中颗粒的接触、键合、重排,使烧结可以在后续的低温第2步烧结中以合适的速率进行。Abstract： The sol-gel auto-combustion was used to prepare the Ni_0.1Mg_0.1Cu_0.3Zn_0.5Fe2O4 ferrite powders and pressed them into ring samples, then sintered the pressed ferrites by single-step sintering process （TL=950℃,1050℃ ） and two-step sintering process（ TH=1050 ℃ ; △t=0,15,30,45min ; TL=950℃ ）, and we studied the in- fluence of two-step sintering process on structure and magnetic properties of NiMgCuZn ferrite. It was found that the two-step sintering process could improve the structure and magnetic properties of the ferrites, and the main conclusion was as follows： （1） As Tz=1050℃ and △t=30min, the bulk ferrite sintered by the two-step sintering process got the biggest density of all the ferrites and had the lest porosity,（2） As Tu=1050℃ and △t=lSmin, the bulk ferrite sintered by the two-step sintering process had a very uniform structure with best grain boundary, and improved the saturation magnetization 10emu/g than the ferrites sintered by the two-step sin- tering process;（3） In the single-step sintering process, with the increase of sintering temperature the initial permeability decreased; In the two-step sintering process, with the preservation time △t t of the first step in- creased the initial permeability improved, and the initial permeability of all the ferrites were more than the initial permeability of the ferrite sintered by the single-step sintering process at 950℃;（4）The mechanism of the two-step sintering process was analyzed, it was that the first sintering step could promote particles body contact, bonding, rearrangement, and made the second sintering step process at the right rate.

关 键 词：镍镁铜锌铁氧体 溶胶凝胶法 两步烧结 一步烧结 

分 类 号：TQ58[化学工程—精细化工]