摘要铁氧体作为一种磁性材料在日益新兴的汽车、计算机、雷达及电子通讯领域中被广泛应用，并且在国防工业中发挥着重要作用。目前，铁氧体的发展趋势主要向着多功能化、小型化、高性能化的方向进行发展。本论文采用固相合成法与共沉积法分别制备出微米级和纳米级钴铁氧体粉末，运用流延成型法和固相烧结法来制得CoFe2O4陶瓷，通过改变固含量、烧结温度、保温时间并观察不同尺寸不同固含量粉料的CoFe2O4陶瓷烧结前后的致密度、体积收缩率、微观结构的影响规律。研究发现，钴铁氧体陶瓷的密度随固含量升高而升高，微米级CoFe2O4陶瓷在固含量为40wt。%时密度达到最大5。23g/cm3，此时的收缩率为42。19%，纳米级CoFe2O4陶瓷密度达到3。05g/cm3，此时它的体积收缩率为37。67%。由于微米级粉体间隙大，有利于有机物烧结后成气体排出，所以微米级的瓷体收缩率要比纳米级大。颗粒小的纳米粉料晶粒生长快，间隙大，其表面粗糙无序，微米级则颗粒生长均匀，表面平整。86463

毕业论文关键词： CoFe2O4；流延成型；浆料；固含量

Abstract  Ferrite, as a kind of magnetic material, is widely used in the field of automobile, computer, radar and electronic communication, and plays an important role in the national defense industry。 At present, the development trend of ferrite mainly develops towards the direction of multi function, miniaturization and high performance。 This paper by solid phase synthesis method and codeposition of micron and nanometer cobalt ferrite powders were prepared, using tape casting method and solid phase sintering method to prepared CoFe2O4 ceramic, by changing the solid content, sintering temperature, insulation time and observe the different size different solid CoFe2O4 ceramic sintering of powder content before and after the induced density, volume shrinkage, microstructure of the influence law。 The study found that cobalt ferrite ceramics density increased with solid content increase, the micron CoFe2O4 ceramic in the solid content to 40wt。% density reached the maximum 5。23g/cm3。 At this time of contraction rate reach 42。19%, CoFe2O4 nano ceramic to the largest 3。05g/cm3。 This volume shrinkage rate is 37。67%。 Because of the large gap between micron grade powder, it is favorable for the organic matter to be discharged into gas, so the shrinkage rate of micron grade ceramic is bigger than that of nano scale。 Due to the small particle size of the nano powder grain growth, large gap, the surface roughness of the disorder, micron size particles grow evenly, smooth surface。

Keywords:  CoFe2O4,   Tape casting,   Slurry,   Solid content

目  录

第一章  绪论 1

1。1 钴铁氧体的简介 1

1。2 钴铁氧体的研究现状 2

1。3 制备钴铁氧体的方法 3

1。4 本课题的研究内容和手段 4

第二章  CoFe2O4粉体材料的制备 6

2。1 CoFe2O4粉体的合成 6

2。2 陶瓷制备工艺流程 9

2。3 测量方法及设备 14

第三章  CoFe2O4陶瓷的结构及性能分析 15

3。1 固含量对陶瓷收缩率的影响规律 15

3。2 固含量对陶瓷烧结前后密度变化的影响规律 19

3。3 固含量对钴铁氧体陶瓷显微结构的影响 21