NiZnCu和Ba铁氧体粉末的化学共沉淀法制备及性能研究

发布时间：2018-08-18 15:28

【摘要】：铁氧体是一种应用广泛的非金属磁性材料。化学共沉淀法制备的颗粒具有颗粒细小、表面活性高等优点，对制备低温烧结的铁氧体粉末十分适合。本论文主要采用化学共沉淀法制备了适于低温烧结的NiZnCu软磁铁氧体粉末和M型Ba硬磁铁氧体粉末，并对影响其磁性能和晶体结构的因素进行了分析，得到如下结果：对NiZnCu软磁铁氧体粉末，实验发现，首先，无论是采用NaOH还是Na_2CO_3作为沉淀剂，粉末样品皆形成了单相的尖晶石结构；以Na_2CO_3为沉淀剂制备的样品的Ms比用NaOH为沉淀剂制备的样品略高，而其平均晶粒尺寸远小于以NaOH为沉淀剂制备的粉末，原因是使用Na_2CO_3为沉淀剂阻碍了晶粒的长大。其次，增加二次清洗过程有利于清洗Na~+杂质离子，从而有利于促进样品形成单相和晶粒长大。再次，不同的Li-Cr替换比例对Ni_(0.25-2x)Li_xCr_xCu_(0.15)Zn_(0.6)Fe_2O_4(x=0,0.01,0.02,0.03,0.04)铁氧体的磁性能和晶体大小影响较大，总体上当x=0.02时样品具有较好的磁性能。对名义成分为Ba(ZnTi)_xFe_(12-2x)O_(19)(x=0.0,0.2,0.6,1.0,1.4)的M型Ba铁氧体粉末，实验发现，在非磁性离子(Zn~(2+)和Ti~(4+))联合替换Fe~(3+)的情况下，，取代可以使煅烧温度降低；饱和磁化强度Ms和剩余磁化强度Mr都在x=0.2左右达到最大值，但内禀矫顽力与替换比例呈反比关系。总体来说，当x=0.2~0.6、煅烧温度为1000C时，所得样品性能相对较好。
[Abstract]:Ferrite is a widely used non-metallic magnetic material. The particles prepared by chemical coprecipitation have the advantages of fine particles and high surface activity, which are suitable for preparing ferrite powders sintered at low temperature. In this paper, NiZnCu soft magnetic ferrite powder and M type Ba hard magnetic ferrite powder suitable for low temperature sintering were prepared by chemical coprecipitation method, and the factors affecting their magnetic properties and crystal structure were analyzed. The results are as follows: for the NiZnCu soft magnetic ferrite powder, it is found that, first of all, the single phase spinel structure is formed in the powder samples whether NaOH or Na_2CO_3 is used as precipitant. The Ms of samples prepared with Na_2CO_3 as precipitant is slightly higher than that of samples prepared with NaOH, but the average grain size is much smaller than that of powders prepared with NaOH. The reason is that the use of Na_2CO_3 as precipitant hinders the growth of grains. Secondly, the addition of secondary cleaning process is conducive to the cleaning of Na ~ + impurity ions, thus facilitating the formation of single phase and grain growth of the sample. Thirdly, the different ratio of Li-Cr substitution has a great effect on the magnetic properties and crystal size of Ni0.25-2x LixCrxCu0.15 Zn0.6 Fe_2O_4 (x0. 01 / 0. 02 / 0. 03 / 0. 04) ferrite. For M-type Ba ferrite powders with nominal composition of Ba (ZnTi) xFe12-2x O19 (x0.00.20.20.2o0.60.0.40), it is found that the calcination temperature can be decreased when the substitution of Fe3 is combined with the substitution of non-magnetic ions (Zn2 and Ti4). The results show that the calcination temperature of M type Ba ferrite powders can be decreased when Fe ~ (3) is replaced by non-magnetic ions (Zn ~ (2) and Ti ~ (4) in the presence of non-magnetic ions (Zn ~ (2) and Ti4). The saturation magnetization (Ms) and the residual magnetization (Mr) have reached the maximum values around XG 0.2, but the intrinsic coercivity is inversely proportional to the substitution ratio. On the whole, the properties of the samples obtained are relatively good when the calcination temperature is 1000C.
【学位授予单位】：安徽工业大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TM277

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